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Effects of non-Hermitian perturbations on Weyl Hamiltonians with arbitrary topological charges

  • 发布时间:2020-05-16
  • 点击次数:
  • 发表刊物:Physical Review B
  • 摘要:We provide a systematic study of non-Hermitian topologically charged systems. Starting from a Hermitian Hamiltonian supporting Weyl points with arbitrary topological charge, adding a non-Hermitian perturbation transforms the Weyl points to one-dimensional exceptional contours. We analytically prove that the topological charge is preserved on the exceptional contours. In contrast to Hermitian systems, the addition of gain and loss allows for a new class of topological phase transition: when two oppositely charged exceptional contours touch, the topological charge can dissipate without opening …
  • 卷号:97
  • 期号:7
  • 页面范围:075128
  • 是否译文:
  • 发表时间:2018

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