Supersymmetric spin–phonon coupling prevents odd integer spins from quantum tunneling

Kilian Irländer, Heinz-Jürgen Schmidt and Jürgen Schnack ()
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Kilian Irländer: Fakultät für Physik, Universität Bielefeld
Heinz-Jürgen Schmidt: Fachbereich Physik, Universität Osnabrück
Jürgen Schnack: Fakultät für Physik, Universität Bielefeld

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 3, 1-10

Abstract: Abstract Quantum tunneling of the magnetization is a phenomenon that impedes the use of small anisotropic spin systems for storage purposes even at the lowest temperatures. Phonons, usually considered for temperature dependent relaxation of magnetization over the anisotropy barrier, also contribute to magnetization tunneling for integer spin quantum numbers. Here we demonstrate that certain spin–phonon Hamiltonians are unexpectedly robust against the opening of a tunneling gap, even for strong spin–phonon coupling. The key to understanding this phenomenon is provided by an underlying supersymmetry that involves both spin and phonon degrees of freedom.

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00073-3

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