Liu, Feng, Deng, Hai-Yao  ORCID: https://orcid.org/0000-0001-6065-483X and Wakabayashi, Katsunori
2019.
Helical topological edge states in a quadrupole phase.
Physical Review Letters
122
(8)
, 086804.
10.1103/PhysRevLett.122.086804
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Abstract
A topological electric quadrupole is a recently proposed concept that extends the theory of electric polarization of crystals to higher orders. Such a quadrupole phase supports topological states localized on both edges and corners. In this work, we show that in a quadrupole phase of a honeycomb lattice, topological helical edge states and pseudospin-polarized corner states appear by making use of a pseudospin degree of freedom related to point group symmetry. Furthermore, we argue that a general condition for the emergence of helical edge states in a (pseudo)spinful quadrupole phase is the existence of either mirror or time-reversal symmetry. Our results offer a way of generating topological helical edge states without spin-orbital couplings.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | American Physical Society |
| ISSN: | 0031-9007 |
| Date of First Compliant Deposit: | 20 January 2020 |
| Last Modified: | 04 May 2023 04:08 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/128132 |
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