Electron correlations due to pair spin-orbit interaction in 2D electron systems

We show that the pair spin-orbit interaction (PSOI) created by the Coulomb fields of interacting electrons leads to the appearance of an unconventional correlated electronic state in two-dimensional materials with the large Rashba effect. The effect manifests itse l f at sufficiently strong PSOI as a sharp peak in the structu r e factor, indicating a tendency to form a striped structure with a spatial scale determined by the competition between the Coulomb repulsion and the PSOI-induced attraction of electrons. Above the critical value of PSOI, the system becomes unstable with respect to the charge density fluctuations on this scale.

Automated summary

This study reveals that the pair spin-orbit interaction (PSOI) created by the Coulomb fields of interacting electrons can give rise to an unconventional correlated electronic state in two-dimensional materials with a large Rashba effect. At sufficiently strong PSOI, this effect is indicated by a sharp peak in the structure factor, suggesting a tendency to form a striped structure with a spatial scale determined by the competition between Coulomb repulsion and PSOI-induced electron attraction. Beyond the critical value of PSOI, the system becomes unstable regarding charge density fluctuations on this scale.