Jiang Yongjin, Low Tony, Chang Kai, Katsnelson Mikhail I, Guinea Francisco
Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China and Beijing Computational Science Research Center, Beijing 100084, People's Republic of China.
IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Phys Rev Lett. 2013 Jan 25;110(4):046601. doi: 10.1103/PhysRevLett.110.046601. Epub 2013 Jan 23.
The generation of valley current is a fundamental goal in graphene valleytronics but no practical ways of its realization are known yet. We propose a workable scheme for the generation of bulk valley current in a graphene mechanical resonator through adiabatic cyclic deformations of the strains and a chemical potential in the suspended region. The accompanied strain gauge fields can break the spatial mirror symmetry of the problem within each of the two inequivalent valleys, leading to a finite valley current due to quantum pumping. An all-electrical measurement configuration is designed to detect the novel state with pure bulk valley currents.
谷电流的产生是石墨烯能谷电子学的一个基本目标，但目前尚无实现它的实用方法。我们提出了一种可行的方案，通过对悬浮区域的应变和化学势进行绝热循环形变，在石墨烯机械谐振器中产生体谷电流。伴随产生的应变规范场可以打破两个不等价能谷中每个能谷内问题的空间镜面对称性，由于量子泵浦效应导致有限的谷电流。设计了一种全电学测量配置来检测具有纯体谷电流的新状态。
