Exchange frequencies and magnetic ground state of Wigner crystal in anisotropic two-dimensional electron systems

Chenggang Zhou, Ravindra N. Bhatt

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Abstract

We investigate the effect of mass anisotropy on the magnetic structure of the Wigner crystal of low-density electron systems in two dimensions at T=0. The multiparticle exchange frequencies are calculated with effective mass anisotropy, with and without concomitant lattice distortions. Numerical diagonalization of small lattice sizes with two-, three-, and four-spin exchange terms shows a transition from a ferromagnetic to an antiferromagnetic ground state with increasing mass anisotropy. We map out this transition at various electron densities.

Original languageEnglish (US)
Article number205325
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number20
DOIs
StatePublished - Nov 24 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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