Manipulation and Characterization of the Valley-Polarized Topological Kink States in Graphene-Based Interferometers

作     者：Shu-guang Cheng Haiwen Liu Hua Jiang Qing-Feng Sun X. C. Xie 

作者机构：Department of Physics Northwest University Xi’an 710069 China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi’an 710069 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing 100875 China School of Physical Science and Technology Soochow University Suzhou 215006 China Institute for Advanced Study Soochow University Suzhou 215006 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2018年第121卷第15期

页      面：156801-156801页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China, NSFC, (11574007, 11674028, 11874298, 11534001, 11674264, 11822407) National Natural Science Foundation of China, NSFC NSF of Jiangsu Province, (BK20160007) NBRP, (2015CB921102) Chinese Academy of Sciences, CAS, (XDPB08-4) Chinese Academy of Sciences, CAS National Key Research and Development Program of China, NKRDPC, (2017YFA0303301) National Key Research and Development Program of China, NKRDPC 

主　　题：Quantum transport Topological effects in photonic systems Topological phases of matter Valleytronics Graphene Topological materials Landauer formula S-matrix method in transport 

摘      要：Valley polarized topological kink states, existing broadly in the domain wall of hexagonal lattice systems, are identified in experiments. Unfortunately, only very limited physical properties are given. Using an Aharanov-Bohm interferometer composed of domain walls in graphene systems, we study the periodical modulation of a pure valley current in a large range by tuning the magnetic field or the Fermi level. For a monolayer graphene device, there exists one topological kink state, and the oscillation of the transmission coefficients has a single period. The π Berry phase and the linear dispersion relation of kink states can be extracted from the transmission data. For a bilayer graphene device, there are two topological kink states with two oscillation periods. Our proposal provides an experimentally feasible route to manipulate and characterize the valley-polarized topological kink states in classical wave and electronic graphene-type crystalline systems.