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Jin C, Tang X, Sun Q, Mu C, Krasheninnikov AV, Kou L. Robust Magnetoelectric Coupling in FeTiO 3/Ga 2O 3 Non-van der Waals Heterostructures. J Phys Chem Lett 2024:2650-2657. [PMID: 38422484 DOI: 10.1021/acs.jpclett.4c00029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Magnetoelectric coupling represents a significant breakthrough for next-generation electronics, offering the ability to achieve nonvolatile magnetic control via electrical means. In this comprehensive investigation, leveraging first-principles calculations, we unveil a robust magnetoelectric coupling within multiferroic heterostructures (HSs) by ingeniously integrating a non-van der Waals (non-vdW) magnetic FeTiO3 monolayer with the ferroelectric (FE) Ga2O3. Diverging from conventional van der Waals (vdW) multiferroic HSs, the magnetic states of the FeTiO3 monolayer can be efficiently toggled between ferromagnetic (FM) and antiferromagnetic (AFM) configurations by reversing the polarization of the Ga2O3 monolayer. This intriguing phenomenon arises from polarization-dependent substantial interlayer electron transfers and the interplay between superexchange and direct-exchange magnetic couplings of the iron atoms. The carrier-mediated interfacial interactions induce crucial shifts in Fermi level positions, decisively imparting distinct electronic characteristics near the Fermi level of composite systems. These novel findings offer exciting prospects for the future of magnetoelectric technology.
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Affiliation(s)
- Cui Jin
- School of Science, Shandong Jianzhu University, Jinan 250101, China
| | - Xiao Tang
- College of Science, Nanjing Forestry University, Nanjing 210037, China
| | - Qilong Sun
- School of Science, Shandong Jianzhu University, Jinan 250101, China
| | - Chenxi Mu
- School of Science, Shandong Jianzhu University, Jinan 250101, China
| | - Arkady V Krasheninnikov
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Department of Applied Physics, Aalto University, P.O. Box 11100, 00076 Aalto, Finland
| | - Liangzhi Kou
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, Queensland 4001, Australia
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Mei R, Zhao YF, Wang C, Ren Y, Xiao D, Chang CZ, Liu CX. Electrically Controlled Anomalous Hall Effect and Orbital Magnetization in Topological Magnet MnBi_{2}Te_{4}. PHYSICAL REVIEW LETTERS 2024; 132:066604. [PMID: 38394580 DOI: 10.1103/physrevlett.132.066604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 12/22/2023] [Indexed: 02/25/2024]
Abstract
We propose an intrinsic mechanism to understand the even-odd effect, namely, opposite signs of anomalous Hall resistance and different shapes of hysteresis loops for even and odd septuple layers (SLs), of MBE-grown MnBi_{2}Te_{4} thin films with electron doping. The nonzero hysteresis loops in the anomalous Hall effect and magnetic circular dichroism for even-SLs MnBi_{2}Te_{4} films originate from two different antiferromagnetic (AFM) configurations with different zeroth Landau level energies of surface states. The complex form of the anomalous Hall hysteresis loop can be understood from two magnetic transitions, a transition between two AFM states followed by a second transition to the ferromagnetic state. Our model also clarifies the relationship and distinction between axion parameter and magnetoelectric coefficient, and shows an even-odd oscillation behavior of magnetoelectric coefficients in MnBi_{2}Te_{4} films.
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Affiliation(s)
- Ruobing Mei
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Yi-Fan Zhao
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Chong Wang
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA
| | - Yafei Ren
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA
| | - Di Xiao
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
| | - Cui-Zu Chang
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Chao-Xing Liu
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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3
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Wu C, Sun S, Gong W, Li J, Wang X. Nonvolatile switchable half-metallicity and magnetism in the MXene Hf 2MnC 2O 2/Sc 2CO 2 multiferroic heterostructure. Phys Chem Chem Phys 2024; 26:5323-5332. [PMID: 38268467 DOI: 10.1039/d3cp04847k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
Nonvolatile electrical control of two-dimensional (2D) van der Waals (vdW) magnetism is important for spintronic devices. Here, using first-principles calculations, we systematically investigated the magnetic properties of the MXene Hf2MnC2O2 combined with the ferroelectric MXene Sc2CO2. When flipping the electric polarization of Sc2CO2, a transition between a semiconductor and a half-metal occurs in the Hf2MnC2O2 monolayer. Moreover, the ferromagnetic exchange parameter J1 can be enhanced to 9.67 meV under polarized P↑ of Sc2CO2, much larger than those of the pristine Hf2MnC2O2 monolayer and Hf2MnC2O2/Sc2CO2-P↓. In addition, the easy magnetization axis of the Hf2MnC2O2 monolayer is also dependent on the polarization orientation of Sc2CO2. Our results indicate a multiferroic heterostructure based on MXenes, offering an effective way for obtaining nonvolatile electrical control of electronic and magnetic properties.
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Affiliation(s)
- Changwei Wu
- Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, Guangdong, P. R. China.
- School of Electronic Information and Electrical Engineering, Huizhou University, Huizhou 516001, Guangdong, P. R. China
| | - Shanwei Sun
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China.
| | - Weiping Gong
- Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, Guangdong, P. R. China.
- School of Electronic Information and Electrical Engineering, Huizhou University, Huizhou 516001, Guangdong, P. R. China
| | - Jiangyu Li
- Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R. China.
| | - Xiao Wang
- Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China.
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Yu X, Zhang X, Wang J. Fully Electrically Controlled van der Waals Multiferroic Tunnel Junctions. ACS NANO 2023; 17:25348-25356. [PMID: 38078697 DOI: 10.1021/acsnano.3c08747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
The fully electrical control of the magnetic states in magnetic tunnel junctions is highly pursued for the development of the next generation of low-power and high-density information technology. However, achieving this functionality remains a formidable challenge at present. Here we propose an effective strategy by constructing a trilayer van der Waals multiferroic structure, consisting of CrI3-AgBiPSe6 and Cr2Ge2Te6-In2Se3, to achieve full-electrical control of multiferroic tunnel junctions. Within this structure, two different magnetic states of the magnetic bilayers (CrI3/Cr2Ge2Te6) can be modulated and switched in response to the polarization direction of the adjacent ferroelectric materials (AgBiPSe6/In2Se3). The intriguing magnetization reversal is mainly attributed to the polarization-field-induced band structure shift and interfacial charge transfer. On this basis, we further design two multiferroic tunnel junction devices, namely, graphene/CrI3-AgBiPSe6/graphene and graphene/Cr2Ge2Te6-In2Se3/graphene. In these devices, good interfacial Ohmic contacts are successfully obtained between the graphene electrode and the heterojunction, leading to an ultimate tunneling magnetoresistance of 9.3 × 106%. This study not only proposes a feasible strategy and identifies a promising candidate for achieving fully electrically controlled multiferroic tunnel junctions but also provides insights for designing other advanced spintronic devices.
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Affiliation(s)
- Xing Yu
- Key Laboratory of Quantum Materials and Devices of Ministry of Education School of Physics, Southeast University, Nanjing 211189, People's Republic of China
| | - Xiwen Zhang
- School of Mechanical Engineering, Southeast University, Nanjing 211189, People's Republic of China
| | - Jinlan Wang
- Key Laboratory of Quantum Materials and Devices of Ministry of Education School of Physics, Southeast University, Nanjing 211189, People's Republic of China
- Suzhou Laboratory, Suzhou 215004, People's Republic of China
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Man P, Huang L, Zhao J, Ly TH. Ferroic Phases in Two-Dimensional Materials. Chem Rev 2023; 123:10990-11046. [PMID: 37672768 DOI: 10.1021/acs.chemrev.3c00170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Two-dimensional (2D) ferroics, namely ferroelectric, ferromagnetic, and ferroelastic materials, are attracting rising interest due to their fascinating physical properties and promising functional applications. A variety of 2D ferroic phases, as well as 2D multiferroics and the novel 2D ferrovalleytronics/ferrotoroidics, have been recently predicted by theory, even down to the single atomic layers. Meanwhile, some of them have already been experimentally verified. In addition to the intrinsic 2D ferroics, appropriate stacking, doping, and defects can also artificially regulate the ferroic phases of 2D materials. Correspondingly, ferroic ordering in 2D materials exhibits enormous potential for future high density memory devices, energy conversion devices, and sensing devices, among other applications. In this paper, the recent research progresses on 2D ferroic phases are comprehensively reviewed, with emphasis on chemistry and structural origin of the ferroic properties. In addition, the promising applications of the 2D ferroics for information storage, optoelectronics, and sensing are also briefly discussed. Finally, we envisioned a few possible pathways for the future 2D ferroics research and development. This comprehensive overview on the 2D ferroic phases can provide an atlas for this field and facilitate further exploration of the intriguing new materials and physical phenomena, which will generate tremendous impact on future functional materials and devices.
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Affiliation(s)
- Ping Man
- Department of Chemistry and Center of Super-Diamond & Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong 999077, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, P. R. China
| | - Lingli Huang
- Department of Chemistry and Center of Super-Diamond & Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong 999077, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, P. R. China
| | - Jiong Zhao
- Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, P. R. China
- The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, P. R. China
| | - Thuc Hue Ly
- Department of Chemistry and Center of Super-Diamond & Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong 999077, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, P. R. China
- Department of Chemistry and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong 999077, P. R. China
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Zhang K, Wang X, Mi W. Spin-splitting and switchable half-metallicity in a van der Waals multiferroic CuBiP 2Se 6/GdClBr heterojunction. Phys Chem Chem Phys 2023. [PMID: 37449502 DOI: 10.1039/d3cp02466k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Multiferroic van der Waals (vdW) heterojunctions have a strong and nonvolatile magnetoelectric coupling effect, which is of great significance in spintronic devices. The electronic structure and magnetic properties of a GdClBr/CuBiP2Se6 vdW multiferroic heterojunction have been calculated using first-principles methods. Due to the spin-up charge transfer and Zeeman field, the ferroelectric CuBiP2Se6 exhibits spin splitting at the gamma point. It is found that the electronic structure and magnetic properties of the GdClBr/CuBiP2Se6 vdW multiferroic heterojunction have been significantly modulated by the electric polarization of CuBiP2Se6. During the reversal of the ferroelectric polarization of CuBiP2Se6, the ferromagnetic GdClBr monolayer transforms from a semiconductor to a half-metal. Meanwhile, in both upward and downward ferroelectric polarization, the GdClBr/CuBiP2Se6 heterojunction exhibits perpendicular magnetic anisotropy with a Curie temperature of 239 K. As the strain changes from -6% to 6%, the band structure of GdClBr shifts upward, and the band structure of CuBiP2Se6 shifts downward. Compressive strain can increase the Curie temperature of the GdClBr/CuBiP2Se6 heterojunction. The magnetic anisotropy of heterojunctions highly depends on biaxial strain, where the perpendicular (in-plane) magnetic anisotropy increases with the increased compressive (tensile) strain. The vdW multiferroic GdClBr/CuBiP2Se6 heterojunction has potential applications in spintronic devices.
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Affiliation(s)
- Kai Zhang
- Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
| | - Xiaocha Wang
- Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
| | - Wenbo Mi
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China
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Jin X, Zhang YY, Du S. Recent progress in the theoretical design of two-dimensional ferroelectric materials. FUNDAMENTAL RESEARCH 2023; 3:322-331. [PMID: 38933769 PMCID: PMC11197756 DOI: 10.1016/j.fmre.2023.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 01/11/2023] [Accepted: 02/02/2023] [Indexed: 03/06/2023] Open
Abstract
Two-dimensional (2D) ferroelectrics (FEs), which maintain stable electric polarization in ultrathin films, are a promising class of materials for the development of various miniature functional devices. In recent years, several 2D FEs with unique properties have been successfully fabricated through experiments. They have been found to exhibit some unique properties either by themselves or when they are coupled with other functional materials (e.g., ferromagnetic materials, materials with 5d electrons, etc.). As a result, several new types of 2D FE functional devices have been developed, exhibiting excellent performance. As a type of newly discovered 2D functional material, the number of 2D FEs and the exploration of their properties are still limited and this calls for further theoretical predictions. This review summarizes recent progress in the theoretical predictions of 2D FE materials and provides strategies for the rational design of 2D FE materials. The aim of this review is to provide guidelines for the design of 2D FE materials and related functional devices.
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Affiliation(s)
- Xin Jin
- University of the Chinese Academy of Sciences and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yu-Yang Zhang
- University of the Chinese Academy of Sciences and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shixuan Du
- University of the Chinese Academy of Sciences and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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Liu G, Chen T, Zhou G, Xu Z, Xiao X. Nonvolatile Electrical Control and Reversible Gas Capture by Ferroelectric Polarization Switching in 2D FeI 2/In 2S 3 van der Waals Heterostructures. ACS Sens 2023; 8:1440-1449. [PMID: 36971553 DOI: 10.1021/acssensors.2c02365] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Nonvolatile electrical control is the core of future magnetoelectric nanodevices. In this work, we systematically explore both the electronic structures and transport properties of multiferroic van der Waals (vdW) heterostructures consisting of a ferromagnetic FeI2 monolayer and a ferroelectric In2S3 monolayer using density functional theory and the nonequilibrium Green's function method. The results reveal that the FeI2 monolayer can be reversibly switched between semiconducting and half-metallic properties by nonvolatile control of the In2S3 ferroelectric polarization states. Correspondingly, the proof-of-concept two-probe nanodevice based on the FeI2/In2S3 vdW heterostructure exhibits a significant valving effect by modulating the ferroelectric switching. Moreover, it is also found that the preference of nitrogen-containing gases such as NH3, NO, and NO2 for adsorption on the surface of FeI2/In2S3 vdW heterostructures strongly depends on the polarization direction of the ferroelectric layer. In particular, the FeI2/In2S3 heterostructure shows reversible capture behavior for NH3. As a result, the FeI2/In2S3 vdW heterostructure-based gas sensor demonstrates high selectivity and sensitivity. These findings may open up a new route for the application of multiferroic heterostructures to spintronics, nonvolatile memories, and gas sensors.
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Feng Y, Wang Z, Liu N, Yang Q. First-principles prediction of two-dimensional MnOX (X = Cl, Br) monolayers: the half-metallic multiferroics with magnetoelastic coupling. NANOSCALE 2023; 15:4546-4552. [PMID: 36757295 DOI: 10.1039/d2nr05764f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Two-dimensional (2D) multiferroics have attracted extensive attention in recent years due to their potential applications in nano-electrical devices such as nonvolatile memory and magnetic sensors. However, 2D multiferroic materials with intrinsic ferromagnetism and ferroelasticity are very rare and most of them have low Curie temperatures. Herein, by performing the first-principles calculations, we systematically investigated the electronic structure and the magnetic properties of the MnOX (X = Cl, Br) monolayers. We demonstrated that the MnOX monolayers were intrinsic half-metallic multiferroics with the coexistence of ferromagnetism and ferroelasticity. The Curie temperatures evaluated from Monte Carlo simulations based on the Heisenberg model were about 220 K for MnOCl and 210 K for MnOBr, which could be further enhanced to 235 K and 230 K by 3% tensile strain. Moreover, their ground states exhibited significant big magnetic anisotropy energies of about 0.59 meV along the z-axis for MnOCl and 0.62 meV along the y-axis for MnOBr per unit cell. The in-plane magnetic easy axis of the MnOBr monolayer can be modulated by the ferroelastic switching due to the robust magnetoelastic coupling. These findings highlight that the MnOX monolayers (with 100% spin polarizability and high Curie temperature) are good candidates for next-generation multifunctional nanodevices.
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Affiliation(s)
- Yulin Feng
- College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China.
| | - Zilong Wang
- College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China.
| | - Na Liu
- College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China.
| | - Qing Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
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Zhou Z, Li YL, Sun ZG, Wang JF, Chen MY. The enhanced effect of magnetism on the thermoelectric performance of a CrI 3 monolayer. NANOSCALE 2023; 15:1032-1041. [PMID: 36515259 DOI: 10.1039/d2nr05342j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The effect of magnetism on the thermoelectric (TE) transformation efficiency has recently attracted a lot of attention. A CrI3 monolayer is a two-dimensional (2D) ferromagnetic (FM) semiconductor with a Curie temperature of 45 K. In this work, we employed first-principles calculations within the framework of density functional theory (DFT) combined with the non-equilibrium Green's function (NEGF) method and Landauer-Buttiker theory to study the effect of magnetism on the TE performance of a CrI3 monolayer. The stability, electronic structures, density of states (DOS) and TE parameters of a CrI3 monolayer are calculated. Our calculation results indicate that the TE performance of a CrI3 monolayer in a FM state is superior to that in a non-magnetic (NM) state. Namely, magnetism is beneficial to improving the TE performance. To further investigate the physical mechanism, the phonon group velocity, the electronic and phonon transmission spectra and the effective mass of a CrI3 monolayer in FM and NM states are analyzed in detail. For a CrI3 monolayer in a NM state, the maximum ZT value at 40 K is 0.09 and 0.16 for p-type and n-type doping, respectively. Relative to that in a NM state, the maximum ZT of a CrI3 monolayer in a FM state is largely improved, and can reach 0.23 and 1.58 for p-type and n-type doping. Our research provides a valuable reference by showing that magnetism is a possible factor for improving the TE efficiency.
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Affiliation(s)
- Zhe Zhou
- Department of Physics, School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Yan-Li Li
- Department of Physics, School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Zhi-Gang Sun
- School of Materials Science & Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China
- Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province, Taiyuan 030024, China
| | - Jia-Fu Wang
- Department of Physics, School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Ming-Yan Chen
- Hongzhiwei Technology (Shanghai) Co. Ltd., 1599 Xinjinqiao Road, Pudong, Shanghai, China
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Jia PZ, Xie JP, Chen XK, Zhang Y, Yu X, Zeng YJ, Xie ZX, Deng YX, Zhou WX. Recent progress of two-dimensional heterostructures for thermoelectric applications. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 35:073001. [PMID: 36541472 DOI: 10.1088/1361-648x/aca8e4] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
The rapid development of synthesis and fabrication techniques has opened up a research upsurge in two-dimensional (2D) material heterostructures, which have received extensive attention due to their superior physical and chemical properties. Currently, thermoelectric energy conversion is an effective means to deal with the energy crisis and increasingly serious environmental pollution. Therefore, an in-depth understanding of thermoelectric transport properties in 2D heterostructures is crucial for the development of micro-nano energy devices. In this review, the recent progress of 2D heterostructures for thermoelectric applications is summarized in detail. Firstly, we systematically introduce diverse theoretical simulations and experimental measurements of the thermoelectric properties of 2D heterostructures. Then, the thermoelectric applications and performance regulation of several common 2D materials, as well as in-plane heterostructures and van der Waals heterostructures, are also discussed. Finally, the challenges of improving the thermoelectric performance of 2D heterostructures materials are summarized, and related prospects are described.
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Affiliation(s)
- Pin-Zhen Jia
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Jia-Ping Xie
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Xue-Kun Chen
- School of Mathematics and Physics, University of South China, Hengyang 421001, People's Republic of China
| | - Yong Zhang
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Xia Yu
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Yu-Jia Zeng
- School of Materials Science and Engineering and Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China
| | - Zhong-Xiang Xie
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Yuan-Xiang Deng
- Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, People's Republic of China
| | - Wu-Xing Zhou
- School of Materials Science and Engineering and Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China
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12
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Hu C, Chen J, Du E, Ju W, An Y, Gong SJ. Ferroelectric control of band alignments and magnetic properties in the two-dimensional multiferroic VSe 2/In 2Se 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:425801. [PMID: 35878601 DOI: 10.1088/1361-648x/ac8406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Our first-principles evidence shows that the two-dimensional (2D) multiferroic VSe2/In2Se3experiences continuous change of electronic structures, i.e. with the change of the ferroelectric (FE) polarization of In2Se3, the heterostructure can possess type-I, -II, and -III band alignments. When the FE polarization points from In2Se3to VSe2, the heterostructure has a type-III band alignment, and the charge transfer from In2Se3into VSe2induces half-metallicity. With reversal of the FE polarization, the heterostructure enters the type-I band alignment, and the spin-polarized current is turned off. When the In2Se3is depolarized, the heterostructure has a type-II band alignment. In addition, influence of the FE polarization on magnetism and magnetic anisotropy energy of VSe2was also analyzed, through which we reveal the interfacial magnetoelectric coupling effects. Our investigation about VSe2/In2Se3predicts its wide applications in the fields of both 2D spintronics and multiferroics.
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Affiliation(s)
- Chen Hu
- School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Ju Chen
- School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Erwei Du
- School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Weiwei Ju
- College of Physics and Engineering and Henan Key Laboratory of Photoelectric Energy Storage Materials and Applications, Henan University of Science and Technology, Luoyang 471023, People's Republic of China
| | - Yipeng An
- School of Physics and Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - Shi-Jing Gong
- School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China
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Yuan J, Dai JQ, Ke C. Remarkable ferroelectricity-modulated electronic and magnetic properties in a 2H-VS 2/BiAlO 3(0001) hybrid system. Phys Chem Chem Phys 2022; 24:18966-18977. [PMID: 35916304 DOI: 10.1039/d2cp01349e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, a 2H-VS2/BiAlO3(0001) hybrid system is constructed to perform first-principles density functional theory (DFT) calculations. The results reveal that, in addition to the ionic-vdW interface coupling, the ferromagnetic semiconductive 2H-VS2 monolayer on the ferroelectric BiAlO3(0001) substrate exhibits n-type or p-type doping behavior and even half-metal characteristics. Furthermore, the magnetoelectric coefficient (αS) for the 2H-VS2/BiAlO3(0001) structures can reach a value of 10-10 G cm2 V-1 with ferroelectric polarization reversal. The estimated Curie temperatures (Tc) of the 2H-VS2 monolayer on the BiAlO3(0001) Z+ (positive), Z+↓ (polarization-reversed Z+), Z- (negative), and Z-↑ (polarization-reversed Z-) polar surfaces were found to be 176, 276, 266, and 87 K, respectively. This indicates that the magnetic properties of the 2H-VS2 monolayer are remarkably tunable using a ferroelectric BiAlO3(0001) knob. These important findings provide a distinctive treatment option for controllable and adjustable nanoelectronic, photoelectronic, and spintronic devices based on a 2H-VS2 monolayer.
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Affiliation(s)
- Jin Yuan
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China.
| | - Jian-Qing Dai
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China.
| | - Cheng Ke
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China.
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14
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Guo Y, Yu X, Zhang Y, Zhang X, Yuan S, Li Y, Yang SA, Wang J. 2D Multiferroicity with Ferroelectric Switching Induced Spin-Constrained Photoelectricity. ACS NANO 2022; 16:11174-11181. [PMID: 35816175 DOI: 10.1021/acsnano.2c04017] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Multiferroic materials with tunable magnetoelectric orders enable the integration of sensing, data storage, and processing into one single device. The scarcity of single-phase multiferroics spurs extensive research in pursuit of composite systems combining different types of ferroic materials. In this work, spin-constrained photoelectric memory is proposed in two-dimensional (2D) layered magnetic/ferroelectric heterostructures, holding the possibility of low-power electrical write operation and nondestructive optical read operation. The ground state of ferromagnetic (FM) and antiferromagnetic (AFM) orderings in the magnetic layer is altered by polarization direction of the ferroelectric layer. Specifically, the FM heterostructure exhibits a type-II band alignment. Due to the light-induced charge transfer, spin-polarized/unpolarized current arises from the FM/AFM state, which can be recorded as the "1"/"0" state and served for logic processing and memory applications. Our first-principles calculations demonstrate that the NiI2/In2Se3 heterobilayer is an ideal candidate to realize such a spin-dependent photoelectric memory. The reversible FM state (easy-axis magnetic anisotropy) and AFM state (easy-plane magnetic orientation) in the NiI2 layer originate from interfacial charge transfer and effective electric field due to the proximity effect. This work offers considerable potential in the integration of memory processing capability into one single device with 2D layered multiferroic heterostructures.
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Affiliation(s)
- Yilv Guo
- School of Physics, Southeast University, Nanjing 211189, China
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Xing Yu
- School of Physics, Southeast University, Nanjing 211189, China
| | - Yehui Zhang
- School of Physics, Southeast University, Nanjing 211189, China
| | - Xiwen Zhang
- School of Mechanism Engineering & School of Physics, Southeast University, Nanjing 211189, China
| | - Shijun Yuan
- School of Physics, Southeast University, Nanjing 211189, China
| | - Yafei Li
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China
| | - Shengyuan A Yang
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Jinlan Wang
- School of Physics, Southeast University, Nanjing 211189, China
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15
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Bao DL, O'Hara A, Du S, Pantelides ST. Tunable, Ferroelectricity-Inducing, Spin-Spiral Magnetic Ordering in Monolayer FeOCl. NANO LETTERS 2022; 22:3598-3603. [PMID: 35451844 DOI: 10.1021/acs.nanolett.1c05043] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Spin spirals (SS) are a special case of noncollinear magnetism, where the magnetic-moment direction rotates along an axis. They have generated interest for novel phenomena, spintronics applications, and their potential formation in monolayers, but the search for monolayers exhibiting SS has not been particularly fruitful. Here, we employ density functional theory calculations to demonstrate that SS form in a recently synthesized monolayer, FeOCl. The SS wavelength and stability can be tuned by doping and uniaxial strain. The SS-state band gap is larger by 0.6 eV compared to the gap of both the ferromagnetic and antiferromagnetic state, enabling bandgap tuning and possibly an unusual formation of quantum wells in a single material via magnetic-field manipulation. The SS-induced out-of-plane ferroelectricity enables switching of the SS chirality by an electric field. Finally, forming heterostructures, for example, with graphene or boron nitride, maintains SS ordering and provides another method of modulation and a potential for magnetoelectric devices.
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Affiliation(s)
- De-Liang Bao
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 United States
- Institute of Physics and University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Andrew O'Hara
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 United States
| | - Shixuan Du
- Institute of Physics and University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Sokrates T Pantelides
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 United States
- Institute of Physics and University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
- Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, Tennessee 37235 United States
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16
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Liu X, Shen C, Li X, Wang T, He M, Li L, Wang Y, Li J, Xia C. Magnetoelectric coupling effects on the band alignments of multiferroic In 2Se 3-CrI 3 trilayer heterostructures. NANOSCALE 2022; 14:5454-5461. [PMID: 35322817 DOI: 10.1039/d1nr06383a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Due to unique magnetoelectric coupling effects, two-dimensional (2D) multiferroic van der Waals heterostructures (vdWHs) are promising for next-generation information processing and storage devices. Here, we design theoretically multiferroic In2Se3/CrI3 trilayer vdWHs with different stacking patterns. For the CrI3/In2Se3/CrI3 trilayer vdWHs, whether ferroelectric upward or downward polarization, type-I and type-II band alignments are formed for spin-up and spin-down channels. However, for the CrI3/In2Se3/In2Se3 trilayer vdWHs, downward polarization induces the type-III band alignment, which is typical for spin-tunnel transistors. Moreover, nonvolatile ferroelectric polarization and stacking patterns can induce the conversion between a unipolar semiconductor and a bipolar (unipolar) half-metal. These results provide a possible route to realize nanoscale multifunctional spintronic devices based on 2D multiferroic systems.
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Affiliation(s)
- Xueying Liu
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Chenhai Shen
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Xueping Li
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
- College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Tianxing Wang
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Mengjie He
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Lin Li
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Ying Wang
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Jingbo Li
- Institute of Semiconductors, South China Normal University, Guangzhou 510631, China.
| | - Congxin Xia
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
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17
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Javaid M, Taylor PD, Tawfik SA, Spencer MJS. Tuning the Schottky barrier height in a multiferroic In 2Se 3/Fe 3GeTe 2 van der Waals heterojunction. NANOSCALE 2022; 14:4114-4122. [PMID: 34904617 DOI: 10.1039/d1nr06906c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The ferroelectric material In2Se3 is currently of significant interest due to its built-in polarisation characteristics that can significantly modulate its electronic properties. Here we employ density functional theory to determine the transport characteristics at the metal-semiconductor interface of the two-dimensional multiferroic In2Se3/Fe3GeTe2 heterojunction. We show a significant tuning of the Schottky barrier height as a result of the change in the intrinsic polarisation state of In2Se3: the switching in the electric polarisation of In2Se3 results in the switching of the nature of the Schottky barrier, from being n-type to p-type, and is accompanied by a change in the spin polarisation of the electrons. This switchable Schottky barrier structure can form an essential component in a two-dimensional field effect transistor that can be operated by switching the ferroelectric polarisation, rather than by the application of strain or electric field. The band structure and density of state calculations show that Fe3GeTe2 lends its magnetic and metallic characteristics to the In2Se3 layer, making the In2Se3/Fe3GeTe2 heterojunction a potentially viable multiferroic candidate in nanoelectronic devices like field-effect transistors. Moreover, our findings reveal a transfer of charge carriers from the In2Se3 layer to the Fe3GeTe2 layer, resulting in the formation of an in-built electric field at the metal-semiconductor interface. Our work can substantially broaden the device potential of the In2Se3/Fe3GeTe2 heterojunction in future low-energy electronic devices.
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Affiliation(s)
- M Javaid
- School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Patrick D Taylor
- School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia.
| | - Sherif Abdulkader Tawfik
- Institute for Frontier Materials, Deakin University Geelong, Victoria 3216, Australia.
- ARC Centre of Excellence in Exciton Science School of Science RMIT University Melbourne, VIC 3001, Australia
| | - Michelle J S Spencer
- School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies, School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
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18
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Xuan X, Yang T, Zhou J, Zhang Z, Guo W. A multiferroic iron arsenide monolayer. NANOSCALE ADVANCES 2022; 4:1324-1329. [PMID: 36133690 PMCID: PMC9419185 DOI: 10.1039/d1na00805f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/21/2022] [Indexed: 06/16/2023]
Abstract
Iron arsenide (FeAs) monolayers are known as a key component for building iron-based superconductors. Here, we predict by first-principles calculations that the FeAs monolayer is a highly stable and multiferroic material with coexisting ferroelasticity and antiferromagnetism. The ferroelasticity entails a reversible elastic strain of as large as 18% and an activation barrier of 20 meV per atom, attributed to a weak hybridization between Fe d and As p orbitals. The local moments of Fe atoms are oriented out-of-plane, so that the magnetic ordering is weakly coupled to the structural polarization. Interestingly, fluorination of the FeAs monolayer can align the local moments in parallel and reorient the easy axis along the in-plane direction. As such, the fluorinated FeAs monolayer is potentially a long-sought multiferroic material that enables a strong coupling between ferroelasticity and ferromagnetism.
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Affiliation(s)
- Xiaoyu Xuan
- Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control of Mechanical Structures, Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
| | - Tingfan Yang
- Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control of Mechanical Structures, Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
| | - Jian Zhou
- Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University Xi'an 710049 China
| | - Zhuhua Zhang
- Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control of Mechanical Structures, Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
| | - Wanlin Guo
- Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control of Mechanical Structures, Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
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19
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Ji S, Fu X, Wang Y, Li X, Quan C, Wu H, Li X, Li F, Pu Y. Tunable magnetoelectric coupling and electrical features in an ultrathin Cr 2Si 2Te 6/In 2Se 3 heterostructure. Phys Chem Chem Phys 2022; 24:3200-3206. [PMID: 35043810 DOI: 10.1039/d1cp04233e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional (2D) van der Waals (vdW) heterostructures based on multiferroic materials have potential applications in novel low-dimensional spintronic devices. In this work, we have investigated a strong magnetoelectric coupling and electrical dependence between single layer (1L) Cr2Si2Te6 and In2Se3. By switching the direction of ferroelectric polarization in In2Se3, we observed a significant magneto-crystalline anisotropy energy (MAE) enhancement of Cr2Si2Te6. The analysis of the spin-resolved orbital-decomposed band structure shows stronger magnetoelectric coupling between the In2Se3 and Cr2Si2Te6 layers. The modulation of the electrical features could also be achieved in the switching of the ferroelectric polarization. Furthermore, the switching of Ohmic-Schottky contacts in the heterojunction with different polarization states was successfully achieved under the effect of strain engineering. Based on these findings, we design a novel 2D ferroelectric-ferromagnetic heterojunction that exploits the controllability and nonvolatility of ferroelectrics to modulate the electrical properties of the device. These findings indicate the high application potential of Cr2Si2Te6/In2Se3 multiferroic heterojunctions in spintronics.
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Affiliation(s)
- Shilei Ji
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Xin Fu
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Yile Wang
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Xianzhi Li
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Chuye Quan
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Hong Wu
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Xing'ao Li
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Feng Li
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
| | - Yong Pu
- New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China.
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20
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Hur JH. First-principles study on multiferroicity in the Cr 2Ge 2Te 6/In 2Se 3 heterostructure influenced by finite strains. Phys Chem Chem Phys 2021; 23:25925-25932. [PMID: 34782900 DOI: 10.1039/d1cp04332c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multiferroic materials that have more than two ferroicities at the same time have long been regarded as one of the strongest candidates to achieve technological breakthroughs in many kinds of nanodevice applications. Various types of multiferroic materials have been discovered and devised to date; however, related studies have been conducted without identifying a complete winner because each has a decisive disadvantage. The recently discovered multiferroicity in the 2D Cr2Ge2Te6/In2Se3 van der Waals heterostructure represents an important opportunity to create a new turning point in multiferroic research. Through first-principles density functional theory calculations, we studied the preferential characteristics of the spin magnetic moment of 2D Cr2Ge2Te6 induced by the ferroelectric switching of the In2Se3 monolayer in the presence of the strains that inevitably exist in any kind of heterostructure. From the results, we found that the multiferroicity in the Cr2Ge2Te6/In2Se3 heterostructure reacts quite sensitively to the strain level, revealing the possibility of manipulating multiferroic properties in the structure.
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Affiliation(s)
- Ji-Hyun Hur
- Department of Electrical Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea.,Hur Advanced Research, 96, Dongtanbanseok-ro, Hwaseong-si, Gyeonggi-do, 18456, Republic of Korea.
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21
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Li W, Zeng Y, Zhao Z, Zhang B, Xu J, Huang X, Hou Y. 2D Magnetic Heterostructures and Their Interface Modulated Magnetism. ACS APPLIED MATERIALS & INTERFACES 2021; 13:50591-50601. [PMID: 34674524 DOI: 10.1021/acsami.1c11132] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In recent years, two-dimensional (2D) magnetic heterostructures have captured widespread interest as they provide a fertile ground for exploring the novel properties induced by interfacial magnetic coupling, modulating the intrinsic magnetism of the 2D magnet, and exploiting new spintronic device applications. In this Spotlight on Applications, dominating synthetic strategies employed to fabricate 2D magnetic heterostructures are introduced first. Notably, we then concentrate on two different kinds of magnetic interfaces, namely, the magnetic-nonmagnetic interface and the magnetic-magnetic interface. Specifically, various interface modulated magnetisms such as valley splitting and the anomalous Hall effect as well as their related device applications such as magnetic tunnel junctions have been further reviewed and discussed. Finally, we briefly summarize the recent progress of 2D magnetic heterostructures and outline the future development direction of this booming field.
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Affiliation(s)
- Wei Li
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Yi Zeng
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Zijing Zhao
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Biao Zhang
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Junjie Xu
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Xiaoxiao Huang
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Yanglong Hou
- Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), School of Materials Science and Engineering, Peking University, Beijing 100871, China
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22
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Wang W, Sun W, Li H, Bai Y, Ren F, You C, Cheng Z. Nonvolatile magnetoelectric coupling in two-dimensional ferromagnetic-bilayer/ferroelectric van der Waals heterostructures. NANOSCALE 2021; 13:14214-14220. [PMID: 34477703 DOI: 10.1039/d1nr01093j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
One of the promising research topics on two-dimensional (2D) van der Waals (vdW) material based devices is the nonvolatile electrical control of magnetism. Usually, it is very hard to tune ferromagnetic or antiferromagnetic ordering by ferroelectric polarization due to strong exchange coupling. The existence of vdW layer spacing, however, which is ubiquitous in 2D materials, makes interlayer magnetic exchange coupling much weaker than interlayer coupling. In this work, we design a multiferroic heterostructure composed of a CrOBr ferromagnetic bilayer and an In2Se3 ferroelectric monolayer. The weaker interlayer exchange coupling of the CrOBr bilayer makes it easier to be regulated by ferroelectric polarization, enabling reversible nonvolatile electric control of shifts between ferromagnetic and antiferromagnetic ordering. The unique electrically controlled interlayer magnetic coupling for tuning the overall magnetism may be available for the practical application of 2D vdW bilayer magnets in high-sensitivity sensors and high-density data storage.
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Affiliation(s)
- Wenxuan Wang
- International Joint Research Laboratory of New Energy Materials and Devices of Henan Province, School of Physics and Electronics, Henan University, Kaifeng 475004, PR China.
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23
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Miao N, Sun Z. Computational design of two‐dimensional magnetic materials. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2021. [DOI: 10.1002/wcms.1545] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Naihua Miao
- School of Materials Science and Engineering Beihang University Beijing China
- Center for Integrated Computational Materials Engineering International Research Institute for Multidisciplinary Science, Beihang University Beijing China
| | - Zhimei Sun
- School of Materials Science and Engineering Beihang University Beijing China
- Center for Integrated Computational Materials Engineering International Research Institute for Multidisciplinary Science, Beihang University Beijing China
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24
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Guo Y, Zhang Y, Zhou Z, Zhang X, Wang B, Yuan S, Dong S, Wang J. Spin-constrained optoelectronic functionality in two-dimensional ferromagnetic semiconductor heterojunctions. MATERIALS HORIZONS 2021; 8:1323-1333. [PMID: 34821925 DOI: 10.1039/d0mh01480j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Two-dimensional (2D) van der Waals (vdW) engineering has brought about many extraordinary and new physics concepts and potential applications. Herein, we propose a new type of spin-constrained optoelectronic device developed using 2D ferromagnetic semiconductor heterostructures (FMSs). It is based on a photoexcited double-band-edge transition model, involved coupling between the interlayer magnetic order and the spin-polarized band structure and can achieve the reversible switch of band alignment via reversal of magnetization. We demonstrate that such a unique magnetic optoelectronic device can be realized with a CrBr3/CrCl3 heterojunction and other 2D FMS heterojunctions that have the same direction as the easy magnetization axis and have a switchable band alignment that allows reconfiguration. This study opens a new application window for 2D vdW heterostructures and enables the possibility for fully vdW-based ultra-compact spintronics devices.
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Affiliation(s)
- Yilv Guo
- School of Physics, Southeast University, Nanjing 211189, China.
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25
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Zhang J, Guo Y, Li P, Wang J, Zhou S, Zhao J, Guo D, Zhong D. Imaging Vacancy Defects in Single-Layer Chromium Triiodide. J Phys Chem Lett 2021; 12:2199-2205. [PMID: 33630596 DOI: 10.1021/acs.jpclett.1c00112] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
As a van der Waals magnetic semiconductor, chromium triiodide (CrI3) is widely considered for its high research value and potential applications. Defects in CrI3 are inevitably present and significantly alter the material properties. However, experimental identification of defects of CrI3 at the atomic level is still lacking. Here for the first time, we carried out a scanning tunneling microscopy (STM) study and density functional theory calculations to explore the intrinsic defects in monolayer CrI3 grown by molecular beam epitaxy. The three most common types of intrinsic point defects, i.e., I vacancy (VI), Cr vacancy (VCr), and multiatom CrI3 vacancy (VCrI3) with distinct spatial distributions of the localized defect states, are identified and characterized by high-resolution STM. Moreover, defect concentrations are estimated based on our experiments, which agree with the calculated formation energies. Our findings provide vital knowledge on the types, concentrations, electronic structures, and migration mechanism of the intrinsic point defects in monolayer CrI3 for future defect engineering of this novel 2D magnet.
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Affiliation(s)
- Jihai Zhang
- School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
- State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275 Guangzhou, China
| | - Yu Guo
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, 116024 Dalian, China
| | - Peigen Li
- School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
- State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275 Guangzhou, China
| | - Jun Wang
- School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
- State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275 Guangzhou, China
| | - Si Zhou
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, 116024 Dalian, China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, 116024 Dalian, China
| | - Donghui Guo
- School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
| | - Dingyong Zhong
- School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
- State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275 Guangzhou, China
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26
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Hu H, Ouyang G. Interface-induced transition from Schottky-to-Ohmic contact in Sc 2CO 2-based multiferroic heterojunctions. Phys Chem Chem Phys 2021; 23:827-833. [PMID: 33399592 DOI: 10.1039/d0cp05684g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In order to achieve a multiferroic heterojunction with a low resistance contact, we investigated a series of Sc2CO2-based van der Waals (vdW) multiferroic heterojunctions in which the ferromagnetics (1T-MnSe2, 1T-VSe2, and 1T-VTe2) were selected as the contact electrodes in terms of first-principles calculations. By reversing the polarization state of Sc2CO2 from Sc-P↑ to Sc-P↓, we found that the heterojunctions converted from Schottky-to-Ohmic contact. Moreover, this conversion, accompanied by an interface charge transfer is intrinsic and is not regulated by the interlayer spacing and biaxial strain. This work provides an avenue for the design of two-dimensional Sc2CO2-based multiferroic electronics in the future.
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Affiliation(s)
- Huamin Hu
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
| | - Gang Ouyang
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
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Ilyas A, Xiang S, Chen M, Khan MY, Bai H, He P, Lu Y, Deng R. Nonvolatile electrical control of 2D Cr 2Ge 2Te 6 and intrinsic half metallicity in multiferroic hetero-structures. NANOSCALE 2021; 13:1069-1076. [PMID: 33393568 DOI: 10.1039/d0nr06054b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The electrical control of two-dimensional (2D) van der Waals ferromagnets is a step forward for the realization of spintronic devices. However, using this approach for practical applications remains challenging due to its volatile memory. Herein, we adopt an alternative strategy, where the bistable ferroelectric switches (P↑ and P↓) of Sc2CO2 (SCO) assist the ferromagnetic states of Cr2Ge2Te6 (CGT) in order to achieve non-volatile memories. Moreover, MXene SCO, being an aided layer in multiferroic CGT/SCO hetero-structures, also modifies the electronic properties of CGT to half metal by its polarized P↓ state. In contrast, the P↑ state does not change the semiconducting nature of CGT. Hence, non-volatile, electrical-controlled switching of ferromagnetic CGT can be engineered by the two opposite ferroelectric states of single layer SCO. Importantly, the magnetic easy axis of CGT switches from in-plane to out-of-plane when the direction of electric polarization of SCO is altered from P↓ to P↑.
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Affiliation(s)
- Asif Ilyas
- School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
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Tang X, Shang J, Ma Y, Gu Y, Chen C, Kou L. Tuning Magnetism of Metal Porphyrazine Molecules by a Ferroelectric In 2Se 3 Monolayer. ACS APPLIED MATERIALS & INTERFACES 2020; 12:39561-39566. [PMID: 32805892 DOI: 10.1021/acsami.0c09247] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Electric field tuning of magnetism is highly desirable for nanoelectronics, but volatility in electron spin manipulation presents a major challenge that needs urgent resolution. Here, we show by first-principles calculations that magnetism of metal porphyrazine (MPz) molecules can be effectively tuned by switching ferroelectric polarization of an adjacent In2Se3 monolayer. The magnetic moments of TiPz and VPz (MnPz, FePz, and CoPz) decrease (increase) at one polarization but remain unchanged at reversed polarization. This intriguing phenomenon stems from distinct metal d-orbital occupation caused by electron transfer and energy-level shift associated with the polarization switch of the In2Se3 monolayer. Moreover, the ferroelectric switch also tunes the underlying electronic properties, producing a metallic, half-metallic, or semiconducting state depending on polarization. These findings of robust ferroelectric tuning of magnetism and related electronic properties in MPz-adsorbed In2Se3 hold great promise for innovative design and implementation in advanced magnetic memory storage, sensor, and spintronic devices.
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Affiliation(s)
- Xiao Tang
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Jing Shang
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Yandong Ma
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yuantong Gu
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Changfeng Chen
- Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154, United States
| | - Liangzhi Kou
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
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Shang J, Tang X, Kou L. Two dimensional ferroelectrics: Candidate for controllable physical and chemical applications. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2020. [DOI: 10.1002/wcms.1496] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jing Shang
- School of Mechanical, Medical and Process Engineering Queensland University of Technology Brisbane Australia
| | - Xiao Tang
- School of Mechanical, Medical and Process Engineering Queensland University of Technology Brisbane Australia
| | - Liangzhi Kou
- School of Mechanical, Medical and Process Engineering Queensland University of Technology Brisbane Australia
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Sheng H, Zhu Y, Bai D, Wu X, Wang J. Thermoelectric properties of two-dimensional magnet CrI 3. NANOTECHNOLOGY 2020; 31:315713. [PMID: 32311678 DOI: 10.1088/1361-6528/ab8b0d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The thermoelectric, phonon transport, and electronic transport properties of two-dimensional magnet CrI3 are systematically investigated by combining density functional theory with Boltzmann transport theory. A low lattice thermal conductivity of 1.355 W m-1K-1 is presented at 300 K due to the low Debye temperature and phonon group velocity. The acoustic modes dominate the lattice thermal conductivity, and the longitudinal acoustic mode has the largest contribution of 42.31% on account of its relatively large phonon group velocity and phonon lifetime. The high band degeneracy and the peaky density of states near the conduction band minimum appear for the CrI3 monolayer, which is beneficial for forming a significantly increased Seebeck coefficient (1561 μV K-1). Furthermore, the thermoelectric figure of merit is calculated reasonably, and the value is 1.57 for the optimal n-type doping level at 900 K. N-type doping maintains a higher thermoelectric conversion efficiency than p-type doping throughout the temperature range, while the difference gradually increases as the temperature rises. Our investigation may provide some theoretical support for the application of the CrI3 monolayer in the thermoelectric field.
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Affiliation(s)
- Haohao Sheng
- School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, People's Republic of China
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