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Seminars

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  • Title:Hunting for the non-Hermitian exceptional points with fidelity susceptibility
  • Start Date/Time:2020-10-06 / 13:30
  • End Date/Time :2020-10-06 / 15:10
    • Speaker:Dr. Yu-Chin Tzeng (NTHU)
    • Place:R019, Phys. Building
    • Host:Prof. Po-Yao Chang (NTHU)
    • Abstract:
      Recently, more and more non-Hermitian systems are experimentally simulated in many optical set up with gain and loss. Besides the optics, the condensed matter theorists have been recently studying on the non-Hermitian effect in the PT-symmetric systems, e.g. the non-Hermitian Su-Schriffer-Heeger (SSH) model. The exceptional point (EP) of a non-Hermitian Hamiltonian is particularly interesting to be analysed before playing with the non-Hermitian systems. However, due to the non-Hermitian quantum mechanics is still new for many researchers, the lack of theoretical tools to detect EP has become a top priority. In our work, the fidelity susceptibility is generalized to the non-Hermitian system by including the geometry of the Hilbert space. The fidelity susceptibility is originally used for detecting quantum phase transition. Now we find that it is also a good tool for the EP.

      Reference arXiv:2009.07070


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