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Past Events
log B Periodic Quantum Oscillations in Topological Semimetals
| Speaker: | Prof. Robert Joynt |
| Affiliation: | MS-Physics-Quantum Computing Program Director, Professor and Associate Chair for Alumni Affairs, Department of Physics, University of Wisconsin-Madison |
| Date: | January 13, 2020 (Monday) |
| Time: | 4:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, HKU |
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.