Reduced density matrix and order parameters of a topological insulator
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AbstractIt 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.
All Author(s) ListWing Chi Yu, Yan Chao Li, P. D. Sacramento, Hai-Qing Lin
Journal namePhysical Review B
Volume Number94
Issue Number24
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics, Condensed Matter;Physics

Last updated on 2020-13-09 at 01:16