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  • Letter
  • Open Access

Difference between angular momentum and pseudoangular momentum

Simon Streib

  • Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden

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Phys. Rev. B 103, L100409 – Published 16 March, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L100409

Abstract

In condensed matter systems it is necessary to distinguish between the momentum of the constituents of the system and the pseudomomentum of quasiparticles. The same distinction is also valid for angular momentum and pseudoangular momentum. Based on Noether's theorem, we demonstrate that the recently discussed orbital angular momenta of phonons and magnons are pseudoangular momenta. This conceptual difference is important for a proper understanding of the transfer of angular momentum in condensed matter systems, especially in spintronics applications.

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Phys. Rev. B 103, L100409– Published 16 March, 2021
  • Received 29 October 2020
  • Accepted 3 March 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

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