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  • Letter
  • Open Access

Chiral phonon induced spin polarization

J. Fransson*

  • Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden

  • *Jonas. Fransson@physics.uu.se
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Phys. Rev. Research 5, L022039 – Published 24 May, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022039

Abstract

The current understanding of chirality suggests the existence of a connection between structure and angular momentum, including spin. This is particularly emphasized in the chiral induced spin selectivity effect, where chiral structures act as spin filters. However, the recent discovery of chiral phonons have demonstrated that phonons too may carry angular momentum which also can be regarded as magnetic moments adding to the total moment. Here, it is shown that chiral phonons may induce a nontrivial spin texture in an otherwise nonmagnetic electronic structure. By considering a setup in which electrons and phonons are interfaced with each other, it is shown that chiral phonons may transfer their angular momentum into the electron reservoir which, thereby, becomes spin polarized. It is, moreover, shown that an equivalent mechanism does not exist whenever the electrons are interfaced with achiral phonons.

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Outline

Information

Phys. Rev. Research 5, L022039– Published 24 May, 2023
  • Received 23 October 2022
  • Revised 22 March 2023
  • Accepted 26 April 2023
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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.

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