Skyrmion crystal from RKKY interaction mediated by 2D electron gas

Wang, Zhentao; Su, Ying; Lin, Shizeng; Batista, Cristian D.

doi:10.1103/PhysRevLett.124.207201

Skyrmion crystal from RKKY interaction mediated by 2D electron gas

Journal Article · Tue May 19 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.207201· OSTI ID:1699484

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Univ. of Tennessee, Knoxville, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We consider a $$C_6$$ 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, $$Q_ν(ν=1,2, 3)$$, is dictated by the Fermi wave number $$k_F:|Q_ν|=2k_F$$. Consequently, the topological contribution to the Hall conductivity of the 2DEG becomes of the order of the quantized value, $e^2/h$, when $$J$$ is comparable to the Fermi energy $$ε_F$$.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725

OSTI ID:: 1699484

Report Number(s):: LA-UR--19-31876

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 124; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Skyrmion crystal from RKKY interaction mediated by 2D electron gas

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