German-Ukrainian Seminar on Quantum Materials
Lecture #6: March 2nd 2023 at 14:00 EET (13:00 CET) // IFW Dresden - D2E.27
Speaker: Dr. Pavel Sukhachov, Yale University
Title: Anomalous sound attenuation and electromagnetic field penetration in Weyl and Dirac materials
Meeting ID: 992 8170 3595 // Passcode: 963908
A salient feature of Weyl and Dirac materials is the possibility to realize the chiral anomaly due to their relativistic-like electronic spectra and nontrivial topology. In this talk, I will present my recent results related to the manifestations of the chiral anomaly in sound attenuation and electromagnetic field penetration. Due to the interplay of intra- and inter-node scattering processes as well as screening, an external magnetic field generically reduces the sound absorption. A nontrivial dependence on the relative direction of the magnetic field and the sound wave vector, i.e., the magnetic sound dichroism, can occur in materials with nonsymmetric Weyl nodes. Also, I will demonstrate that the current response to an electromagnetic field in a Weyl or Dirac semimetal becomes nonlocal due to the chiral anomaly even under the conditions of the normal skin effect. Signatures of this nonlocality may be found in the transmission of electromagnetic waves.