Valley polarization caused by crystalline symmetry breaking
| Autor: | Xingshuai Lv, Yuanyuan Wang, Fengping Li, Wei Wei, Ying Dai, Baibiao Huang |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed matter physics Magnetism Process Chemistry and Technology media_common.quotation_subject 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Asymmetry Inversion (discrete mathematics) Symmetry (physics) Mechanics of Materials Distortion Electric field 0103 physical sciences General Materials Science Symmetry breaking Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Physics::Atmospheric and Oceanic Physics media_common |
| Zdroj: | Materials horizons. 8(1) |
| ISSN: | 2051-6355 |
| Popis: | In two-dimensional (2D) hexagonal lattices with inversion asymmetry, time-reversal (T) connected valleys are at the center of current valleytronic research. In order to trigger valley polarization, dynamical processes and/or magnetism have been considered. In this work, we propose a new mechanism, valley-contrasting sublattice polarization (VCSP), to polarize valleys by reducing the crystalline symmetry that connects the valleys. In our mechanism, significant valley polarization could be readily generated without magnetism, an electric field, or an optical process. Based on tight-binding model analysis and first-principle calculations, the control of valley polarization via crystalline symmetry can be successfully realized in concrete LaOBiS2 polytypes with Peierls-like structure distortion. Our results provide an unprecedented possibility for exploring valley-contrasting physics. |
| Databáze: | OpenAIRE |
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