Wigner crystal of a two-dimensional electron gas with a strong spin-orbit interaction

被引：16
|
作者：
Silvestrov, P. G. [1 ,2 ,3 ]
Entin-Wohlman, O. [4 ,5 ]
机构：
[1] Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany
[2] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst, D-14195 Berlin, Germany
[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math Phys, D-38106 Braunschweig, Germany
[4] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[5] Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv, Israel
来源：
PHYSICAL REVIEW B | 2014年 / 89卷 / 15期
关键词：
CRYSTALLIZATION; TRANSITION; STATE;
D O I：
10.1103/PhysRevB.89.155103
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：7
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