Noncontact Spin Pumping by Microwave Evanescent Fields

Journal article (2020)

Authors

T. Yu Kavli institute of nanoscience Delft, QN/Bauer Group - AS
G.E. Bauer QN/Bauer Group - AS , Tohoku University, Kavli institute of nanoscience Delft
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2020 T. Yu, G.E. Bauer
DOI: https://doi.org/10.1103/PhysRevLett.124.236801
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

The angular momentum of evanescent light fields has been studied in nano-optics and plasmonics but not in the microwave regime. Here we predict noncontact pumping of electron spin currents in conductors by the evanescent stray fields of excited magnetic nanostructures. The coherent transfer of the photon to the electron spin is proportional to the g factor, which is large in narrow gap semiconductors and surface states of topological insulators. The spin pumping current is chiral when the spin susceptibility displays singularities that indicate collective states. However, 1D systems with linear dispersion at the Fermi energy, such as metallic carbon nanotubes, are an exception since spin pumping is chiral even without interactions.