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

Shu-guang Cheng, Haiwen Liu, Hua Jiang, Qing-Feng Sun, and X. C. Xie
Phys. Rev. Lett. 121, 156801 – Published 8 October 2018
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Abstract

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.

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  • Received 10 May 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.156801

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shu-guang Cheng1,2, Haiwen Liu3, Hua Jiang4,5,*, Qing-Feng Sun6,7,8,†, and X. C. Xie6,7,8

  • 1Department of Physics, Northwest University, Xi’an 710069, China
  • 2Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi’an 710069, China
  • 3Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China
  • 4School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • 5Institute for Advanced Study, Soochow University, Suzhou 215006, China
  • 6International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
  • 7Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
  • 8CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China

  • *jianghuaphy@suda.edu.cn
  • sunqf@pku.edu.cn

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Issue

Vol. 121, Iss. 15 — 12 October 2018

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