Chiral properties of topological-state loops

Marko M. Grujić, Milan Ž. Tadić, and François M. Peeters
Phys. Rev. B 91, 245432 – Published 26 June 2015

Abstract

The angular momentum quantization of chiral gapless modes confined to a circularly shaped interface between two different topological phases is investigated. By examining several different setups, we show analytically that the angular momentum of the topological modes exhibits a highly chiral behavior, and can be coupled to spin and/or valley degrees of freedom, reflecting the nature of the interface states. A simple general one-dimensional model, valid for arbitrarily shaped loops, is shown to predict the corresponding energies and the magnetic moments. These loops can be viewed as building blocks for artificial magnets with tunable and highly diverse properties.

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  • Received 23 February 2015
  • Revised 5 June 2015

DOI:https://doi.org/10.1103/PhysRevB.91.245432

©2015 American Physical Society

Authors & Affiliations

Marko M. Grujić1,2,*, Milan Ž. Tadić1, and François M. Peeters2

  • 1School of Electrical Engineering, University of Belgrade, P.O. Box 3554, 11120 Belgrade, Serbia
  • 2Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

  • *marko.grujic@etf.bg.ac.rs

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Vol. 91, Iss. 24 — 15 June 2015

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