Skyrmion Crystal from RKKY Interaction Mediated by 2D Electron Gas

2019/11/30 by Zhentao Wang, Ying Su, Shi-Zeng Lin +1
Physics and Astronomy · #cond-mat.str-el #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevlett.124.207201

published as Phys. Rev. Lett. 124, 207201 (2020) · 7 pages, 4 figures

arxiv created 2020/05/19 · arxiv updated 2020/05/20

Abstract

We consider a C₆ invariant lattice of magnetic moments coupled via a Kondo exchange J with a 2D electron gas (2DEG). The effective Ruderman-Kittel-Kasuya-Yosida interaction between the moments stabilizes a magnetic skyrmion crystal in the presence of magnetic field and easy-axis anisotropy. An attractive aspect of this mechanism is that the magnitude of the magnetic ordering wave vectors, \mathbf Q_ν (ν=1,2,3), is dictated by the Fermi wave number k_F: |\mathbf Q_ν |=2k_F. Consequently, the topological contribution to the Hall conductivity of the 2DEG becomes of the order of the quantized value, e²/h, when J is comparable to the Fermi energy ε_F.

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