Honors & Awards


  • Chi-Sun YEH Prize, Tsinghua University (2019.07)
  • Tsinghua Presidential Award(清华大学特等奖学金), Tsinghua University (2018.12)

Education & Certifications


  • B.S., Tsinghua University, Math and Physics (2019)

All Publications


  • Non-Hermitian Chern Bands PHYSICAL REVIEW LETTERS Yao, S., Song, F., Wang, Z. 2018; 121 (13): 136802

    Abstract

    The relation between chiral edge modes and bulk Chern numbers of quantum Hall insulators is a paradigmatic example of bulk-boundary correspondence. We show that the chiral edge modes are not strictly tied to the Chern numbers defined by a non-Hermitian Bloch Hamiltonian. This breakdown of conventional bulk-boundary correspondence stems from the non-Bloch-wave behavior of eigenstates (non-Hermitian skin effect), which generates pronounced deviations of phase diagrams from the Bloch theory. We introduce non-Bloch Chern numbers that faithfully predict the numbers of chiral edge modes. The theory is backed up by the open-boundary energy spectra, dynamics, and phase diagram of representative lattice models. Our results highlight a unique feature of non-Hermitian bands and suggest a non-Bloch framework to characterize their topology.

    View details for DOI 10.1103/PhysRevLett.121.136802

    View details for Web of Science ID 000445515500010

    View details for PubMedID 30312068

  • Edge States and Topological Invariants of Non-Hermitian Systems PHYSICAL REVIEW LETTERS Yao, S., Wang, Z. 2018; 121 (8): 086803

    Abstract

    The bulk-boundary correspondence is among the central issues of non-Hermitian topological states. We show that a previously overlooked "non-Hermitian skin effect" necessitates redefinition of topological invariants in a generalized Brillouin zone. The resultant phase diagrams dramatically differ from the usual Bloch theory. Specifically, we obtain the phase diagram of the non-Hermitian Su-Schrieffer-Heeger model, whose topological zero modes are determined by the non-Bloch winding number instead of the Bloch-Hamiltonian-based topological number. Our work settles the issue of the breakdown of conventional bulk-boundary correspondence and introduces the non-Bloch bulk-boundary correspondence.

    View details for DOI 10.1103/PhysRevLett.121.086803

    View details for Web of Science ID 000442348000009

    View details for PubMedID 30192628

  • Topological invariants of Floquet systems: General formulation, special properties, and Floquet topological defects PHYSICAL REVIEW B Yao, S., Yan, Z., Wang, Z. 2017; 96 (19)
  • Non-Hermitian Skin Effect and Chiral Damping in Open Quantum Systems PHYSICAL REVIEW LETTERS Song, F., Yao, S., Wang, Z. 2019; 123 (17)