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  • Letter
  • Open Access

Interstate Berry curvature of hinge state and its detection

Zheng Liu1, Zhenhua Qiao1,2,*, Yang Gao1,2,†, and Qian Niu1

  • 1CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2ICQD, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China

  • *Corresponding author: qiao@ustc.edu.cn
  • †Corresponding author: ygao87@ustc.edu.cn
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Phys. Rev. Research 6, L012005 – Published 11 January, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012005

Abstract

We demonstrate that the topological hinge state can possess a nontrivial interstate Berry curvature in the non-Abelian formulation of the Berry curvature. It can be readily probed by the circular photogalvanic effect (CPGE), with the light illuminating a specific hinge, and we refer to it as the hinge CPGE. As a concrete example, we calculate the hinge CPGE in ferromagnetic MnBi2nTe3n+1, and find that the hinge CPGE peak structure well reflects the interstate Berry curvature of hinge states and the optical sum rule captures the interstate Berry curvature between the hinge state and the ground state. Thus, the hinge CPGE provides a promising route towards the optical detection of a hinge-state geometrical structure.

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Phys. Rev. Research 6, L012005– Published 11 January, 2024
  • Received 9 December 2022
  • Revised 2 July 2023
  • Accepted 13 December 2023
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