Reduced density matrix and order parameters of a topological insulator

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number245123
Journal / PublicationPhysical Review B
Volume94
Issue number24
Publication statusPublished - 15 Dec 2016
Externally publishedYes

Abstract

It has been recently proposed that the reduced density matrix may be used to derive the order parameter of a condensed matter system. Here we propose order parameters for the phases of a topological insulator, specifically a spinless Su-Schrieffer-Heeger (SSH) model, and consider the effect of short-range interactions. All the derived order parameters and their possible corresponding quantum phases are verified by the entanglement entropy and electronic configuration analysis results. The order parameter appropriate to the topological regions is further proved by calculating the Berry phase under twisted boundary conditions. It is found that the topological nontrivial phase is robust to the introduction of repulsive intersite interactions and can appear in the topological trivial parameter region when appropriate interactions are added.

Citation Format(s)

Reduced density matrix and order parameters of a topological insulator. / Yu, Wing Chi; Li, Yan Chao; Sacramento, P. D.; Lin, Hai-Qing.

In: Physical Review B, Vol. 94, No. 24, 245123, 15.12.2016.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review