Abstract
Weyl semimetals show the chiral anomaly and topological Fermi arc surface states among other dramatic physical effects. We show another surprising effect: discrete scale invariance. This invariance leads to bound state spectra that repeat when the binding energy is changed by a fixed factor, reminiscent of fractal behavior. It can be observed in a magnetic field B: there are oscillations in the magnetoresistance somewhat similar to Shubnikov- deHaas oscillations but with a periodicity in ln(B) rather than 1/B. These oscillations have now been seen in ZrTe5, HfTe5, and TaAs.
Coffee and tea will be served 20 minutes prior to the seminar.
Anyone interested is welcome to attend.