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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Electrons: Low-Dimensional Systems - Models 1
TT 3.11: Vortrag
Montag, 11. März 2013, 12:15–12:30, H9
Wigner Crystal in a Two-Dimensional Electron Gas with Strong Spin-Orbit Interaction — •Peter Silvestrov1, Ora Entin-Wohlman2, and Yoseph Imry3 — 1Dahlem Center for Complex Quantum Systems, Freie Universitaet Berlin, 14195 Berlin, Germany — 2Physics Department, Ben Gurion University, Beer Sheva 84105, Israel — 3Department of Condensed Matter Physycs, Weizmann Institute of Science, Rehovot 76100, Israel
The Wigner crystal phase of a two-dimensional electron gas with unscreened Coulomb repulsion and Rashba spin-orbit interaction is investigated. We assume that the electron density is sufficiently low such that the spin-orbit interaction dominates over the electrons kinetic energy. In this limit the degeneracy of the minimum of the lower spin-orbit-split subband results in a strong change of the crystals properties. We predict a spontaneous breaking of the ground state symmetry, where all electrons have a finite momentum corresponding to one point at the bottom of a Mexican-hat shaped subband. In this phase electrons in the Wigner crystal become in-plane polarized and the plasmon dispersion acquires a strong angular dependance. The symmetry breaking results also in a (slight) squeezing of the triangular lattice.