Quantum Collapse of a Skyrmion

ORAL

Abstract

We analytically and numerically investigate the quantum collapse of a small skyrmion in a thin magnetic film with Dzyaloshinskii-Moriya interaction (DMI). The stability threshold determined by the DMI, the external magnetic field, and the underlying atomic lattice has been computed. The Lagrangian describing the coupled dynamics of the skyrmion size and the chirality angle has been derived. An instanton solution of the equations of motion that corresponds to the skyrmion underbarrier contraction via quantum tunneling has been obtained. The tunneling rate has been computed and the conditions needed to observe quantum collapse of a skyrmion in a magnetic film have been elucidated [1].

[1] A. Derras-Chouk, E. M. Chudnovsky, and D. A. Garanin, Phys. Rev. B, 98, 024423 (2018)

*This work has been supported by the grant No. DEFG02-93ER45487 funded by the U.S. Department of Energy, Office of Science.

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Presenters

  • Amel Derras-Chouk

    • CUNY Graduate Center and Herbert H. Lehman College

Authors

  • Amel Derras-Chouk

    • CUNY Graduate Center and Herbert H. Lehman College

  • Eugene M Chudnovsky

    • CUNY Graduate Center and Herbert H. Lehman College

  • Dmitry Garanin

    • CUNY Graduate Center and Herbert H. Lehman College