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

ORAL

Abstract

Valley polarized topological kink states, existing broadly in the domain wall of hexagonal lattice systems, are identified in experiments. 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. The realization of the proposal in photonic graphene is also discussed.

–

Presenters

  • Hua Jiang

    Soochow University, School of Physical Science and Technology, Soochow University, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, China

Authors

  • Shuguang Cheng

    Department of Physics, Northwest University, China

  • Haiwen Liu

    Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University

  • Hua Jiang

    Soochow University, School of Physical Science and Technology, Soochow University, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, China

  • Qing-Feng Sun

    School of Physics, Peking University, International Center for Quantum Materials, Peking University

  • Xincheng Xie

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing, International Center for Quantum Materials, School of Physics, Peking University, Beijing, China