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Lafuente-Bartolome J, Lian C, Giustino F. Topological polarons in halide perovskites. Proc Natl Acad Sci U S A 2024; 121:e2318151121. [PMID: 38758696 PMCID: PMC11127022 DOI: 10.1073/pnas.2318151121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 03/29/2024] [Indexed: 05/19/2024] Open
Abstract
Halide perovskites emerged as a revolutionary family of high-quality semiconductors for solar energy harvesting and energy-efficient lighting. There is mounting evidence that the exceptional optoelectronic properties of these materials could stem from unconventional electron-phonon couplings, and it has been suggested that the formation of polarons and self-trapped excitons could be key to understanding such properties. By performing first-principles simulations across the length scales, here we show that halide perovskites harbor a uniquely rich variety of polaronic species, including small polarons, large polarons, and charge density waves, and we explain a variety of experimental observations. We find that these emergent quasiparticles support topologically nontrivial phonon fields with quantized topological charge, making them nonmagnetic analog of the helical Bloch points found in magnetic skyrmion lattices.
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Affiliation(s)
- Jon Lafuente-Bartolome
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX78712
- Department of Physics, The University of Texas at Austin, Austin, TX78712
| | - Chao Lian
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX78712
- Department of Physics, The University of Texas at Austin, Austin, TX78712
| | - Feliciano Giustino
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX78712
- Department of Physics, The University of Texas at Austin, Austin, TX78712
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Chen X, Ding X, Gou G, Zeng XC. Strong Sliding Ferroelectricity and Interlayer Sliding Controllable Spintronic Effect in Two-Dimensional HgI 2 Layers. NANO LETTERS 2024; 24:3089-3096. [PMID: 38426455 DOI: 10.1021/acs.nanolett.3c04869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Exploration of two-dimensional (2D) sliding ferroelectric (FE) materials with experimentally detectable ferroelectricity and value-added novel functionalities is highly sought for the development of 2D "slidetronics". Herein, based on first-principles calculations, we identify the synthesizable van der Waals (vdW) layered crystals HgX2 (X = Br and I) as a new class of 2D sliding ferroelectrics. Both HgBr2 and HgI2 in 2D multilayered forms adopt the preferential stacking sequence, leading to room temperature stable out-of-plane (vertical) ferroelectricity that can be reversed via the sliding of adjacent monolayers. Owing to strong interlayer coupling and interfacial charge rearrangement, 2D HgI2 layers possess strong sliding ferroelectricity up to 0.16 μC/cm2, readily detectable in experiment. Moreover, robust sliding ferroelectricity and interlayer sliding controllable Rashba spin texture of FE-HgI2 layers enable potential applications as 2D spintronic devices such that the electric control of electron spin detection can be realized at the 2D regime.
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Affiliation(s)
- Xinfeng Chen
- Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Xinkai Ding
- Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
- School of Energy Materials & Chemical Engineering, Hefei University, Hefei 230601, People's Republic of China
| | - Gaoyang Gou
- Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - Xiao Cheng Zeng
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, People's Republic of China
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Park J, Huh S, Choi YW, Kang D, Kim M, Kim D, Park S, Choi HJ, Kim C, Yi Y. Visualizing the Low-Energy Electronic Structure of Prototypical Hybrid Halide Perovskite through Clear Band Measurements. ACS NANO 2024; 18:7570-7579. [PMID: 38377437 DOI: 10.1021/acsnano.3c12587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Organic-inorganic hybrid perovskites (OIHPs) are a promising class of materials that rival conventional semiconductors in various optoelectronic applications. However, unraveling the precise nature of their low-energy electronic structures continues to pose a significant challenge, primarily due to the absence of clear band measurements. Here, we investigate the low-energy electronic structure of CH3NH3PbI3 (MAPI3) using angle-resolved photoelectron spectroscopy combined with ab initio density functional theory. We successfully visualize the electronic structure of MAPI3 near the bulk valence band maximum by using a laboratory photon source (He Iα, 21.2 eV) at low temperature and explore its fundamental properties. The observed valence band exhibits a highly isotropic and parabolic band characterized by small effective masses of 0.20-0.21 me, without notable spectral signatures associated with a large polaron or the Rashba effect, subjects that are intensely debated in the literature. Concurrently, our spin-resolved measurements directly disprove the giant Rashba scenario previously suggested in a similar perovskite compound by establishing an upper limit for the Rashba parameter (αR) of 0.28 eV Å. Our results unveil the unusually complex nature of the low-energy electronic structure of OIHPs, thereby advancing our fundamental understanding of this important class of materials.
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Affiliation(s)
- Jeehong Park
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Soonsang Huh
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Center for Correlated Electron System, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
| | - Young Woo Choi
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Donghee Kang
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Minsoo Kim
- Center for Correlated Electron System, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea
| | - Donghan Kim
- Center for Correlated Electron System, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea
| | - Soohyung Park
- Advanced Analysis Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Hyoung Joon Choi
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Changyoung Kim
- Center for Correlated Electron System, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea
| | - Yeonjin Yi
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea
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Coccia C, Moroni M, Malavasi L. Chiral Metal Halide Perovskites: Focus on Lead-Free Materials and Structure-Property Correlations. Molecules 2023; 28:6166. [PMID: 37630418 PMCID: PMC10457802 DOI: 10.3390/molecules28166166] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/16/2023] [Accepted: 08/19/2023] [Indexed: 08/27/2023] Open
Abstract
Hybrid organic-inorganic perovskites (HOIPs) are promising materials in several fields related to electronics, offering long carrier-diffusion lengths, high absorption coefficients, tunable band gaps, and long spin lifetimes. Recently, chiral perovskites have attracted huge interest thanks to the possibility of further widening the applications of HOIPs. Chiral materials, being intrinsically non-centrosymmetric, display several attractive physicochemical properties, including circular dichroism, circularly polarized photoluminescence, nonlinear optics, ferroelectricity, and spin-related effects. Recent studies have shown that chirality can be transferred from the chiral organic ligands into the inorganic perovskite framework, resulting in materials combining the advantages of both chirality and perovskite superior optoelectronic characteristics. As for HOIPs for photovoltaics, strong interest is currently devoted towards the development of lead-free chiral perovskites to overcome any toxicity issue. While considering the basic and general features of chiral HOIPs, this review mainly focuses on lead-free materials. It highlights the first attempts to understand the correlation between the crystal structure characteristics and the chirality-induced functional properties in lead and lead-free chiral perovskites.
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Affiliation(s)
| | | | - Lorenzo Malavasi
- Department of Chemistry and INSTM, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (C.C.); (M.M.)
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Zhong F, Nie GZ, Lang Y, Zhang Z, Li H, Gan L, Xu Y, Zhao YQ. First-principles study on photoelectric properties of all-inorganic two-dimensional double perovskite Cs 3AgBiBr 7. Phys Chem Chem Phys 2023; 25:3175-3181. [PMID: 36621958 DOI: 10.1039/d2cp04707a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Two-dimensional (2D) all-inorganic double perovskite materials have attracted great interest owing to their unique photoelectric characteristics, such as high quantum efficiency and relative stability. However, few studies have been conducted on the 2D all-inorganic double perovskite Cs3AgBiBr7, and its photoelectric properties are unclear. In this study, we present a detailed investigation of the band structure, optical absorption spectrum, carrier mobility and exciton binding energy of the double perovskite Cs3AgBiBr7 based on the first-principles. The results show that this system has an indirect band gap and low carrier mobility, high exciton binding energy (2041.38 meV) and significant light absorption in the UV region. We also find that the material may be a potential exciton insulation candidate owing to the exciton binding energy beyond the band gap. Our calculated results also show that low dimensional perovskite Cs3AgBiBr7 is more suitable for luminescence than a photovoltaic device. We hope our theoretical results will inspire and promote the experimental exploration of 2D all-inorganic double perovskite materials for photoelectric applications.
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Affiliation(s)
- Fang Zhong
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Guo-Zheng Nie
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Yufei Lang
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Ziwen Zhang
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Huilin Li
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Longfei Gan
- School of Microelectronics and Physics, Hunan University of Technology and Business, Changsha 410205, People's Republic of China
| | - Ying Xu
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
| | - Yu-Qing Zhao
- School of Physics and Electronics Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China. .,Hunan Provincial key Laboratory of Intelligent Sensors and New Sensor Materials, Xiangtan 411201, Hunan, People's Republic of China
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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.
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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.
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Rybkin AG, Tarasov AV, Rybkina AA, Usachov DY, Petukhov AE, Eryzhenkov AV, Pudikov DA, Gogina AA, Klimovskikh II, Di Santo G, Petaccia L, Varykhalov A, Shikin AM. Sublattice Ferrimagnetism in Quasifreestanding Graphene. PHYSICAL REVIEW LETTERS 2022; 129:226401. [PMID: 36493449 DOI: 10.1103/physrevlett.129.226401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 08/17/2022] [Accepted: 10/14/2022] [Indexed: 06/17/2023]
Abstract
We show that graphene can be magnetized by coupling to a ferromagnetic Co film through a Au monolayer. The presence of dislocation loops under graphene leads to a ferrimagnetic ordering of moments in the two C sublattices. It is shown that the band gap of ∼80 meV in the K[over ¯] point has a magnetic nature and exists for ferrimagnetic ordering. Interplay between Rashba and exchange couplings is evidenced by spin splitting asymmetry in spin-ARPES measurements and fully supported by DFT calculation of a (9×9) unit cell. Owing to sign-opposite Berry curvatures for K[over ¯] and K[over ¯]^{'} valleys, the synthesized system is promising for the realization of a circular dichroism Hall effect.
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Affiliation(s)
- Artem G Rybkin
- St. Petersburg State University, 198504 St. Petersburg, Russia
| | - Artem V Tarasov
- St. Petersburg State University, 198504 St. Petersburg, Russia
| | - Anna A Rybkina
- St. Petersburg State University, 198504 St. Petersburg, Russia
| | | | | | | | | | | | - Ilya I Klimovskikh
- St. Petersburg State University, 198504 St. Petersburg, Russia
- Center for Advanced Mesoscience and Nanotechnology, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - Giovanni Di Santo
- Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Luca Petaccia
- Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Andrei Varykhalov
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, D-12489 Berlin, Germany
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