Reduced density matrix and order parameters of a topological insulator
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要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.
著者Wing Chi Yu, Yan Chao Li, P. D. Sacramento, Hai-Qing Lin
期刊名稱Physical Review B
出版年份2016
月份12
日期16
卷號94
期次24
出版社AMER PHYSICAL SOC
頁次245123
國際標準期刊號2469-9950
電子國際標準期刊號2469-9969
語言英式英語
Web of Science 學科類別Physics, Condensed Matter;Physics

上次更新時間 2020-15-10 於 02:47