1
|
Chen B, Zhou B, Wang X. Valley polarization and magnetic anisotropy of two-dimensional Ni 2Cl 3I 3/MoSe 2 heterostructures. NANOSCALE 2024; 16:12196-12206. [PMID: 38842385 DOI: 10.1039/d4nr01253d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
Two-dimensional (2D) Janus trihalides have attracted widespread attention due to their potential applications in spintronics. In this work, the valley polarization of MoSe2 at the K' and K points can be modulated by Ni2Cl3I3, a new 2D Janus trihalide. The Ni2Cl3I3/MoSe2 heterostructure has an in-plane magnetic anisotropy energy (IMA) and is characterized by three distinct electronic structures: metallic, semiconducting, and half-metallic. It is noted that the semiconducting state features a band gap of 0.07 eV. When spin-orbit coupling (SOC) is considered, valley polarization is exhibited in the Ni2Cl3I3/MoSe2 heterostructure, with the degree of valley polarization varying across different configurations and reaching a maximum value of 4.6 meV. The electronic properties, valley polarization and MAE of the system can be tuned by biaxial strains. The application of a biaxial strain ranging from -6% to +6% can enhance the valley polarization value from 0.9 meV to 12.9 meV. The directions of MAE of the Ni2Cl3I3/MoSe2 heterostructure can be changed at biaxial strains of -6%, +2%, +4% and +6%. The above calculation results show that the heterostructure system possesses rich electronic properties and tunability, with extensive potential applications in the fields of spintronic and valleytronic devices.
Collapse
Affiliation(s)
- Bo Chen
- Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
| | - Baozeng Zhou
- 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.
| |
Collapse
|
2
|
Chen J, Koc H, Zhao S, Wang K, Chao L, Eginligil M. Emerging Nonlinear Photocurrents in Lead Halide Perovskites for Spintronics. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1820. [PMID: 38673177 PMCID: PMC11051301 DOI: 10.3390/ma17081820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 04/07/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024]
Abstract
Lead halide perovskites (LHPs) containing organic parts are emerging optoelectronic materials with a wide range of applications thanks to their high optical absorption, carrier mobility, and easy preparation methods. They possess spin-dependent properties, such as strong spin-orbit coupling (SOC), and are promising for spintronics. The Rashba effect in LHPs can be manipulated by a magnetic field and a polarized light field. Considering the surfaces and interfaces of LHPs, light polarization-dependent optoelectronics of LHPs has attracted attention, especially in terms of spin-dependent photocurrents (SDPs). Currently, there are intense efforts being made in the identification and separation of SDPs and spin-to-charge interconversion in LHP. Here, we provide a comprehensive review of second-order nonlinear photocurrents in LHP in regard to spintronics. First, a detailed background on Rashba SOC and its related effects (including the inverse Rashba-Edelstein effect) is given. Subsequently, nonlinear photo-induced effects leading to SDPs are presented. Then, SDPs due to the photo-induced inverse spin Hall effect and the circular photogalvanic effect, together with photocurrent due to the photon drag effect, are compared. This is followed by the main focus of nonlinear photocurrents in LHPs containing organic parts, starting from fundamentals related to spin-dependent optoelectronics. Finally, we conclude with a brief summary and future prospects.
Collapse
Affiliation(s)
| | | | | | | | - Lingfeng Chao
- Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China; (J.C.); (H.K.); (S.Z.); (K.W.)
| | - Mustafa Eginligil
- Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China; (J.C.); (H.K.); (S.Z.); (K.W.)
| |
Collapse
|
3
|
Fontenele RA, Dos Anjos Sousa Júnior S, Cysne TP, Costa NC. The impact of Rashba spin-orbit coupling in charge-ordered systems. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:225601. [PMID: 38394686 DOI: 10.1088/1361-648x/ad2cc9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 02/23/2024] [Indexed: 02/25/2024]
Abstract
We study the impact of the Rashba spin-orbit coupling (RSOC) on the stability of charge-density wave (CDW) in systems with large electron-phonon coupling (EPC). Here, the EPC is considered in the framework of the Holstein model at the half-filled square lattice. We obtain the phase diagram of the Rashba-Holstein model using the Hartree-Fock mean-field theory, and identify the boundaries of the CDW and Rashba metal phases. We notice that the RSOC disfavors the CDW phase, driving the system to a correlated Rashba metal. Also, we employ a cluster perturbation theory (CPT) approach to investigate the phase diagram beyond the Hartree-Fock approximation. The quantum correlations captured by CPT indicate that the RSOC is even more detrimental to CDW than previously anticipated. That is, the Rashba metal region is observed to be expanded in comparison to the mean-field case. Additionally, we investigate pairing correlations, and the results further strengthen the identification of critical points.
Collapse
Affiliation(s)
- Rodrigo A Fontenele
- Instituto de Física, Universidade Federal do Rio de Janeiro Cx.P. 68.528, 21941-972 Rio de Janeiro, RJ, Brazil
| | | | - Tarik P Cysne
- Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil
| | - Natanael C Costa
- Instituto de Física, Universidade Federal do Rio de Janeiro Cx.P. 68.528, 21941-972 Rio de Janeiro, RJ, Brazil
| |
Collapse
|
4
|
Gul SH, Alrebdi TA, Idrees M, Amin B. Tunable electronic structures, Rashba splitting, and optical and photocatalytic responses of MSSe-PtO 2 (M = Mo, W) van der Waals heterostructures. NANOSCALE ADVANCES 2023; 5:5829-5837. [PMID: 37881719 PMCID: PMC10597551 DOI: 10.1039/d3na00347g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 08/23/2023] [Indexed: 10/27/2023]
Abstract
Binding energies, AIMD simulation and phonon spectra confirm both the thermal and dynamical stabilities of model-I and model-II of MSSe-PtO2 (M = Mo, W) vdWHs. An indirect type-II band alignment in both the models of MSSe-PtO2 vdWHs and a larger Rashba spin splitting in model-II than in model-I provide a platform for experimental design of MSSe-PtO2 vdWHs for optoelectronics and spintronic device applications. Transfer of electrons from the MSSe layer to the PtO2 layer at the interface of MSSe-PtO2 vdWHs makes MSSe (PtO2) p(n)-type. Large absorption in the visible region of MoSSe-PtO2 vdWHs, while blue shifts in WSSe-PtO2 vdWHs are observed. In the case of model-II of MSSe-PtO2 vdWHs, a further blue shift is observed. Furthermore, the photocatalytic response shows that MSSe-PtO2 vdWHs cross the standard water redox potentials confirming their capability to split water into H+/H2 and O2/H2O.
Collapse
Affiliation(s)
- Sadia H Gul
- Department of Physics, Abbottabad University of Science & Technology Abbottabad 22010 Pakistan +92-333-943-665 +92-333-943-665
| | - Tahani A Alrebdi
- Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University PO Box 84428 Riyadh 11671 Saudi Arabia
| | - M Idrees
- School of Physics and Electronic Engineering, Jiangsu University Zhenjiang 212013 Jiangsu China
| | - B Amin
- Department of Physics, Abbottabad University of Science & Technology Abbottabad 22010 Pakistan +92-333-943-665 +92-333-943-665
| |
Collapse
|
5
|
Botella R, Kistanov AA, Cao W. Swarm Smart Meta-Estimator for 2D/2D Heterostructure Design. J Chem Inf Model 2023; 63:6212-6223. [PMID: 37796976 PMCID: PMC10598791 DOI: 10.1021/acs.jcim.3c01509] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Indexed: 10/07/2023]
Abstract
Two-dimensional (2D) semiconductors are central to many scientific fields. The combination of two semiconductors (heterostructure) is a good way to lift many technological deadlocks. Although ab initio calculations are useful to study physical properties of these composites, their application is limited to few heterostructure samples. Herein, we use machine learning to predict key characteristics of 2D materials to select relevant candidates for heterostructure building. First, a label space is created with engineered labels relating to atomic charge and ion spatial distribution. Then, a meta-estimator is designed to predict label values of heterostructure samples having a defined band alignment (descriptor). To this end, independently trained k-nearest neighbors (KNN) regression models are combined to boost the regression. Then, swarm intelligence principles are used, along with the boosted estimator's results, to further refine the regression. This new "swarm smart" algorithm is a powerful and versatile tool to select, among experimentally existing, computationally studied, and not yet discovered van der Waals heterostructures, the most likely candidate materials to face the scientific challenges ahead.
Collapse
Affiliation(s)
- Romain Botella
- Nano and Molecular Systems Research
Unit, Faculty of Science, University of
Oulu, FIN 90014 Oulu, Finland
| | - Andrey A. Kistanov
- Nano and Molecular Systems Research
Unit, Faculty of Science, University of
Oulu, FIN 90014 Oulu, Finland
| | - Wei Cao
- Nano and Molecular Systems Research
Unit, Faculty of Science, University of
Oulu, FIN 90014 Oulu, Finland
| |
Collapse
|
6
|
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.
Collapse
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
| |
Collapse
|
7
|
Cayao J. Exceptional degeneracies in non-Hermitian Rashba semiconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:254002. [PMID: 37021876 DOI: 10.1088/1361-648x/acc7e9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 03/27/2023] [Indexed: 06/19/2023]
Abstract
Exceptional points (EPs) are spectral degeneracies of non-Hermitian (NH) systems where eigenvalues and eigenvectors coalesce, inducing unique topological phases that have no counterpart in the Hermitian realm. Here we consider an NH system by coupling a two-dimensional semiconductor with Rashba spin-orbit coupling (SOC) to a ferromagnet lead and show the emergence of highly tunable EPs along rings in momentum space. Interestingly, these exceptional degeneracies are the endpoints of lines formed by the eigenvalue coalescence at finite real energy, resembling the bulk Fermi arcs commonly defined at zero real energy. We then show that an in-plane Zeeman field provides a way to control these exceptional degeneracies although higher values of non-Hermiticity are required in contrast to the zero Zeeman field regime. Furthermore, we find that the spin projections also coalescence at the exceptional degeneracies and can acquire larger values than in the Hermitian regime. Finally, we demonstrate that the exceptional degeneracies induce large spectral weights, which can be used as a signature for their detection. Our results thus reveal the potential of systems with Rashba SOC for realizing NH bulk phenomena.
Collapse
Affiliation(s)
- Jorge Cayao
- Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden
| |
Collapse
|
8
|
Li T, Xu Y, Li M, Zhou Q, Wu C, Wang Z, Ju W. A study of the Rashba effect in two-dimensional ternary compounds ABC monolayers (A = Sb, Bi; B = Se, Te; C = Br; I). Phys Chem Chem Phys 2023; 25:3182-3189. [PMID: 36622128 DOI: 10.1039/d2cp05002a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The structure and electronic and spintronic properties of two-dimensional (2D) ternary compounds ABC (A = Sb, Bi; B = Se, Te; C = Br; I) monolayers are investigated using the first-principles method. The ABC monolayers possess typical Janus structures with a considerable potential gradient normal to the surface, inducing intrinsic Rashba spin splitting (RSS) at the conduction band minimum near the Γ point. Among them, the splitting strength of the BiSeI monolayer is the largest and its Rashba coefficient can reach 1.84 eV Å. The projected energy band of the BiSeI monolayer suggests that the RSS state is mainly rooted in the Bi-pz orbital. The RSS strength can be modulated by applying the in-plane strain. The tensile strain can improve the RSS strength, which is ascribed to the increase of the potential gradient normal to the surface. These results indicate that these 2D ternary compounds have great potential for application in tunable spintronic devices.
Collapse
Affiliation(s)
- Tongwei Li
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Yanmin Xu
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Mengjie Li
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Qingxiao Zhou
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Caixia Wu
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Zhaowu Wang
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| | - Weiwei Ju
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
| |
Collapse
|
9
|
Gu H, Guo Z, Huang L, Fang M, Liu S. Investigations of Optical Functions and Optical Transitions of 2D Semiconductors by Spectroscopic Ellipsometry and DFT. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:196. [PMID: 36616106 PMCID: PMC9823946 DOI: 10.3390/nano13010196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/28/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Optical functions and transitions are essential for a material to reveal the light-matter interactions and promote its applications. Here, we propose a quantitative strategy to systematically identify the critical point (CP) optical transitions of 2D semiconductors by combining the spectroscopic ellipsometry (SE) and DFT calculations. Optical functions and CPs are determined by SE, and connected to DFT band structure and projected density of states via equal-energy and equal-momentum lines. The combination of SE and DFT provides a powerful tool to investigate the CP optical transitions, including the transition energies and positions in Brillouin zone (BZ), and the involved energy bands and carries. As an example, the single-crystal monolayer WS2 is investigated by the proposed method. Results indicate that six excitonic-type CPs can be quantitatively distinguished in optical function of the monolayer WS2 over the spectral range of 245-1000 nm. These CPs are identified as direct optical transitions from three highest valence bands to three lowest conduction bands at high symmetry points in BZ contributed by electrons in S-3p and W-5d orbitals. Results and discussion on the monolayer WS2 demonstrate the effectiveness and advantages of the proposed method, which is general and can be easily extended to other materials.
Collapse
Affiliation(s)
- Honggang Gu
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science & Technology, Wuhan 430074, China
- Optics Valley Laboratory, Wuhan 430074, China
| | - Zhengfeng Guo
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science & Technology, Wuhan 430074, China
- Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Liusheng Huang
- Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Mingsheng Fang
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science & Technology, Wuhan 430074, China
| | - Shiyuan Liu
- State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science & Technology, Wuhan 430074, China
- Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, China
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| |
Collapse
|
10
|
Chen J, Wu K, Hu W, Yang J. High-Throughput Inverse Design for 2D Ferroelectric Rashba Semiconductors. J Am Chem Soc 2022; 144:20035-20046. [DOI: 10.1021/jacs.2c08827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jiajia Chen
- Department of Chemical Physics, Hefei National Research Center for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, Anhui Center for Applied Mathematics, and School of Data Science, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Kai Wu
- Department of Chemical Physics, Hefei National Research Center for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, Anhui Center for Applied Mathematics, and School of Data Science, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Wei Hu
- Department of Chemical Physics, Hefei National Research Center for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, Anhui Center for Applied Mathematics, and School of Data Science, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Jinlong Yang
- Department of Chemical Physics, Hefei National Research Center for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, Anhui Center for Applied Mathematics, and School of Data Science, University of Science and Technology of China, Hefei, Anhui230026, China
| |
Collapse
|