Skyrmion crystal from RKKY interaction mediated by 2DEG

ORAL

Abstract

Skyrmion crystals have been found in centro-symmetric itinerant magnets, where the long-range Ruderman-Kittel-Kasuya-Yoshida (RKKY) effective coupling is believed to be the dominant interaction between the local moments. In this work we show that the RKKY interaction mediated by a dilute (kF«1) 2D electron gas (2DEG) on a C6 invariant lattice stabilizes a magnetic skyrmion crystal in the presence of magnetic field and easy-axis anisotropy. A remarkable aspect of this mechanism is that the ordering wave vectors of the resulting skyrmion crystal are dictated by the Fermi wave vector: |Qν|=2kF (ν=1,2,3). Consequently, the topological contribution to the Hall conductivity of the 2DEG becomes very large within the weak-coupling regime: the quantized value e2/h is reached when J becomes comparable to the Fermi energy EF.

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Presenters

  • Zhentao Wang

    • University of Tennessee, Knoxville

Authors

  • Zhentao Wang

    • University of Tennessee, Knoxville

  • Ying Su

    • Los Alamos Natl Lab
    • Theoretical Division, T-4 and CNLS, Los Alamos National Laboratory
    • Los Alamos National Laboratory

  • Shizeng Lin

    • Theoretical Division, Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • Theoretical Division, T-4, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Lab
    • Theoretical Division, T-4 and CNLS, Los Alamos National Laboratory
    • Los Alamos National Lab

  • Cristian Batista

    • Physics and Astronomy, The University of Tennessee
    • Neutron Scattering Division and Shull-Wollan Center, Oak Ridge National Laboratory
    • Department of Physics and Astronomy, The University of Tennessee
    • University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee