Journal
PHYSICAL REVIEW B
Volume 89, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.155103
Keywords
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Funding
- Alexander von Humboldt Foundation
- Israeli Science Foundation (ISF)
- US-Israel Binational Science Foundation (BSF)
- DFG [RE 2978/1-1]
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TheWigner-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 60. 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.
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