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Anomaly-induced sound absorption in Weyl semimetals

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4]
  1. Tel Aviv Univ., Tel Aviv (Israel); OSTI
  2. Univ. of Virginia, Charlottesville, VA (United States)
  3. Skolkovo Institute of Science and Technology, Moscow (Russia); Univ. of Washington, Seattle, WA (United States); L. D. Landau Institute for Theoretical Physics, Moscow (Russia)
  4. Tel Aviv Univ., Tel Aviv (Israel)
+ Show Author Affiliations
We develop a semiclassical theory of sound absorption in Weyl semimetals in magnetic fields. In this work, we focus on the contribution to the absorption that stems from the existence of Berry monopoles in the band structure of such materials or, equivalently, due to the chiral anomaly and chiral magnetic effect. Sound absorption is shown to come primarily from the motion of Weyl nodes in energy space, associated with the propagation of a sound wave. We argue that acoustic magnetochiral dichroism, which occurs when absorption of sound is different for opposite propagation directions and for opposite directions of the magnetic field, can be a definitive probe of band topology. The part of the monopole-related sound magnetoabsorption that is even in the magnetic field is negative in time-reversal Weyl materials. The difference in the sign of the effect as compared to the positive anomaly-related transport magnetoconductance stems from the existence of valley electrochemical imbalances without magnetic field in the sound propagation problem. In centrosymmetric Weyl semimetals with few Weyl nodes, the magnetoabsorption is negative at low frequencies but can change signs with increasing frequency.
Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
Israel Science Foundation (ISF); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46452
OSTI ID:
1849810
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Anomalous sound attenuation in Weyl semimetals in magnetic and pseudomagnetic fields journal June 2021

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