APS Logo

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.

–

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