Quantum Phases of Three-Dimensional Chiral Topological Insulators on a Spin Quantum Simulator.
Quantum Phases of Three-Dimensional Chiral Topological Insulators on a Spin Quantum Simulator.
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自旋量子模拟器上三维手性拓扑绝缘体的量子相
DOI：
10.1103/physrevlett.125.090502
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发表时间：
2020-08
影响因子：
8.6
通讯作者：
T. Xin;Yishan Li;Yu-ang Fan;Xuanran Zhu;Yingjie Zhang;Xinfang Nie;Jun Li;Qihang Liu;Dawei Lu
中科院分区：
文献类型：
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作者：
T. Xin;Yishan Li;Yu-ang Fan;Xuanran Zhu;Yingjie Zhang;Xinfang Nie;Jun Li;Qihang Liu;Dawei Lu
近年来，对物质拓扑相的探测已成为一个热点问题。传统上，凝聚态物理学中特定拓扑相的实现依赖于探测真实的材料的潜在表面能带色散或量子输运特征，其可能是不完美的或甚至不存在。另一方面，量子模拟提供了一种替代方法，可以在通用量子计算机上直接测量拓扑不变量。然而，由于目前实验平台的技术限制，实验证明高维拓扑相仍然是一个挑战。在这里，我们调查的三维拓扑绝缘体中的AIII（手征酉）对称类，但缺乏实验实现。使用核磁共振系统，我们在实验上证明了它们的拓扑性质，其中采用动力学猝灭方法，并观察到动量空间中的动力学体边界对应。其结果是，拓扑不变量测量的带反转表面上的高精度，表现出的退相干效应的鲁棒性。我们的信通过可控的量子相变为更高维度和更复杂系统中物质拓扑相的量子模拟铺平了道路。
The detection of topological phases of matter has become a central issue in recent years. Conventionally, the realization of a specific topological phase in condensed matter physics relies on probing the underlying surface band dispersion or quantum transport signature of a real material, which may be imperfect or even absent. On the other hand, quantum simulation offers an alternative approach to directly measure the topological invariant on a universal quantum computer. However, experimentally demonstrating high-dimensional topological phases remains a challenge due to the technical limitations of current experimental platforms. Here, we investigate the three-dimensional topological insulators in the AIII (chiral unitary) symmetry class, which yet lack experimental realization. Using the nuclear magnetic resonance system, we experimentally demonstrate their topological properties, where a dynamical quenching approach is adopted and the dynamical bulk-boundary correspondence in the momentum space is observed. As a result, the topological invariants are measured with high precision on the band-inversion surface, exhibiting robustness to the decoherence effect. Our Letter paves the way toward the quantum simulation of topological phases of matter in higher dimensions and more complex systems through controllable quantum phases transitions.