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

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.

arXiv comment5 pages, 5 figures, supplemetary material

References in corpus (5)

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• Spin Tunneling and Phonon-assisted Relaxation in Mn12-acetate
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Cited by in corpus (2)

• Vibronic effects on the quantum tunnelling of magnetisation in Kramers single-molecule magnets
• Toroidal magnetic molecules stripped to their basics