Gate-field control of valley polarization in valleytronics  

作　　者：张婷婷 韩依琳 张闰午 余智明 Ting-Ting Zhang;Yilin Han;Run-Wu Zhang;Zhi-Ming Yu(Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement,Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems,and School of Physics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement,Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems,and School of Physics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Chinese Physics B》2024年第6期2-12,共11页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 12004035);the National Natural Science Fund for Excellent Young Scientists Fund Program(Overseas)。

摘　　要：Valleytronics materials are a kind of special semiconductors which can host multiple symmetry-connected and wellseparated electron or hole pockets in the Brillouin zone when the system is slightly n or p doped. Since the low-energy particles residing in these pockets generally are not easily scattered to each other by small perturbations, they are endowed with an additional valley degree of freedom. Analogous to spin, the valley freedom can be used to process information,leading to the concept of valleytronics. The prerequisite for valleytronics is the generation of valley polarization. Thus,a focus in this field is achieving the electric generation of valley polarization, especially the static generation by the gate electric field alone. In this work, we briefly review the latest progress in this research direction, focusing on the concepts of the couplings between valley and layer, i.e., the valley–layer coupling which permits the gate-field control of the valley polarization, the couplings between valley, layer, and spin in magnetic systems, the physical properties, the novel designing schemes for electronic devices, and the material realizations of the gate-controlled valleytronics materials.

关 键 词：band structure electronic transport optical properties SPINTRONICS 

分 类 号：O469[理学—凝聚态物理]