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

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...

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Bibliographic Details
Published in:Physical review letters 2018-10, Vol.121 (15), p.156801-156801, Article 156801
Main Authors: Cheng, Shu-Guang, Liu, Haiwen, Jiang, Hua, Sun, Qing-Feng, Xie, X C
Format: Article
Language:English
Subjects:
Bilayers
Domain walls
Graphene
Hexagonal lattice
Interferometers
Physical properties
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.156801