Novel Z2 Topological Metals and Semimetals

Y. X. Zhao and Z. D. Wang
Phys. Rev. Lett. 116, 016401 – Published 6 January 2016
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Abstract

We report two theoretical discoveries for Z2 topological metals and semimetals. It is shown first that any dimensional Z2 Fermi surface is topologically equivalent to a Fermi point. Then the famous conventional no-go theorem, which was merely proven before for Z Fermi points in a periodic system without any discrete symmetry, is generalized so that the total topological charge is zero for all cases. Most remarkably, we find and prove an unconventional strong no-go theorem: all Z2 Fermi points have the same topological charge νZ2=1 or 0 for periodic systems. Moreover, we also establish all six topological types of Z2 models for realistic physical dimensions.

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  • Received 11 June 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.016401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. X. Zhao* and Z. D. Wang

  • Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China

  • *yuxinphy@hku.hk
  • zwang@hku.hk

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Issue

Vol. 116, Iss. 1 — 8 January 2016

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