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Cited by 106Topological Materials and PhenomenaAdvanced Condensed Matter Physics2D Materials and Applications

A Large Effective Phonon Magnetic Moment in a Dirac Semimetal

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Cheng, Bing, Schumann, T., Wang, Youcheng, Zhang, X., Barbalas, D., Stemmer, S., Armitage, N. P.·2020·Nano Letters
DOI 10.1021/acs.nanolett.0c01983
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Abstract

and observed a particularly low frequency optical phonon as well as a very prominent and field-sensitive cyclotron resonance. As the cyclotron frequency is tuned with the field to pass through the phonon, the phonon becomes circularly polarized, as shown by a notable splitting in its response to right- and left-hand polarized light. This splitting can be expressed as an effective phonon magnetic moment that is approximately 2.7 times the Bohr magneton, which is almost 4 orders of magnitude larger than ab initio calculations predict for phonon magnetic moments in nonmagnetic insulators. This exceedingly large value is due to the coupling of the phonons to the cyclotron motion and is controlled directly by the electron-phonon coupling constant. This field-tunable circular-polarization-selective coupling provides new functionality for nonlinear optics to create light-induced topological phases in Dirac semimetals.

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  • A phonon magnetic moment four orders of magnitude larger than expected from pure phonon motion was observed in a Dirac semimetal.

    “Recently, a phonon magnetic moment four orders of magnitude larger than expected from pure phonon motion was observed in a Dirac semimetal27.”

    From Terahertz electric-field-driven dynamical multiferroicity in SrTiO3 (2024) · cites this paper as [27]

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Authors
Cheng, B., Schumann, T., Wang, Y., Zhang, X., Barbalas, D., Stemmer, S., & Armitage, N. P.
Affiliations
  • Johns Hopkins University (US)
  • University of California, Santa Barbara (US)
Corresponding author
Armitage, N. P.
ORCID
Venue
Nano Letters
Publisher
American Chemical Society (ACS)
Published
2020-07-07
Volume
20
Issue
8
Pages
5991-5996
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
DOI
10.1021/acs.nanolett.0c01983
OpenAlex
W3042118259
Cited by
106
References
3
Citations by year
2026: 19 · 2025: 22 · 2024: 22 · 2023: 17 · 2022: 14 · 2021: 11 · 2019: 1
FWCI
4.24
Type
journal article
Language
en
Open access
Licence
Locations
  • Nano Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Army Research Office (W911NF-15-1-0560)
  • U.S. Department of Defense (N00014-16-1-2814)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
Keywords
Dirac semimetal, cyclotron resonance, electron-phonon coupling, nonlinear optics

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