Wigner crystal of a two-dimensional electron gas with a strong spin-orbit interaction
arXiv:1309.2307 · doi:10.1103/PhysRevB.89.155103
Abstract
The Wigner-crystal phase of two-dimensional electrons interacting via the Coulomb repulsion and subject to a strong Rashba spin-orbit coupling is investigated. For low enough electronic densities the spin-orbit band splitting can be larger than the zero-point energy of the lattice vibrations. Then the degeneracy of the lower subband results in a spontaneous symmetry breaking of the vibrational ground state. The rotational symmetry of the triangular (spin-orbit coupling free) structure is lost, and the unit cell of the new lattice contains two electrons. Breaking the rotational symmetry also leads to a (slight) squeezing of the underlying triangular lattice.
5 pages + appendix, 3 figures, minor improvements to the text
References in corpus (3)
Cited by in corpus (14)
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