物理
拓扑绝缘体
可见的
四极
量子
拓扑序
拓扑(电路)
量子模拟器
自旋(空气动力学)
量子力学
量子计算机
数学
组合数学
热力学
作者
Dafa Zhao,Shunzhong Xue,Dong Ruan,Jun Li,Dawei Lu,Wen Huang,Tao Xin,Hang Li,Xinfang Nie,Gui‐Lu Long
出处
期刊:Physical review
[American Physical Society]
日期:2021-12-29
卷期号:104 (6)
被引量:2
标识
DOI:10.1103/physreva.104.062615
摘要
Recently, higher-order topological insulators have drawn much attention from researchers. For chiral-symmetric one-dimensional systems, the mean chiral displacement, a bulk observable related to the topological invariant, can distinguish topological states from trivial phases. Naturally, there exists an analogous quality for the higher-order one. In a previous work [T. Mizoguchi, Y. Kuno, and Y. Hatsugai, Phys. Rev. Lett. 126, 016802 (2021)], the mean chiral quadrupole moment is introduced. Inspired by this work, we investigate the quadrupolar phase of a higher-order topological insulator on a spin quantum simulator. With focus on a two-particle noninteracting Benalcazar-Bernevig-Hughes model, by changing the amplitude of hopping interactions, we first observe quantum phase transitions from topological phase to trivial phase using a spin simulator experimentally. Since the mean chiral quadrupole moment has robustness against environmental noise, we also test its dependence on perturbations. As an exploration of the bulk observable of a higher-order topological insulator, it may provide one path to investigate arbitrary dimensional systems.
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