Chiral anomaly in wave propagation through Weyl and Dirac semimetals

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• Pavlo Sukhachov, Yale University
• Monday 19 June 2023, 14:00-15:30
• on Zoom (please email Hannah for the Zoom link).

If you have a question about this talk, please contact Dr Hannah Price.

Note: **unusual day of the week**

Owing to their nontrivial topology and relativistic-like electronic spectra, Dirac and Weyl semimetals realize various anomalous responses including the celebrated chiral anomaly. In this talk, I will discuss 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 [1]. 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. I will also 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 [2]. Signatures of this nonlocality may be found in the transmission of electromagnetic waves.

[1] P. O. Sukhachov and L. I. Glazman, Anomalous electromagnetic field penetration in a Weyl or Dirac semimetal, Phys. Rev. Lett. 128, 146801 (2022). [2] P. O. Sukhachov and L. I. Glazman, Anomalous sound attenuation in Weyl semimetals in magnetic and pseudomagnetic fields, Phys. Rev. B 103 , 214310 (2021).

This talk is part of the Theoretical Physics Seminars series.

This talk is included in these lists:

• Bham Talks
• Theoretical Physics Seminars
• What's on in Physics?
• on Zoom (please email Hannah for the Zoom link)

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