Discrete Scale Invariance in Topological Semimetals

  • Event Date: 2023-03-07
  • Computational quantum materials
  • Speaker: Prof. Robert Joynt (University of Wisconsin-Madison)  /  Host:
    Place: 4F Lecture Hall, Cosmology Hall NTU (Hybrid, Webex)

Title：Discrete Scale Invariance in Topological Semimetals
Time：2023/03/07 (Tue.) 10:20
Place：4F Lecture Hall, Cosmology Hall NTU (Hybrid, Webex)

Online Link：https://nationaltaiwanuniversity-zbh.my.webex.com/nationaltaiwanuniversity-zbh.my/j.php?MTID=mf21d7af1253ad22ecb2ff965ab56e298
Meeting number: 2555 750 9659
Password: WZv2QBYY4P6 (99827299 from phones and video systems)

Abstract：
Weyl and Dirac semimetals show anomalous quantum oscillations in the strong magnetic field (B) limit.  Very surprisingly, the oscillations are periodic in ln B.  We propose that the oscillations come from bound state spectra for Coulomb impurities that repeat when the binding energy is changed by a fixed factor, a signature of discrete scale invariance. The oscillations have now been seen in ZrTe₅, HfTe₅, TaAs, and graphene.

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