Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.20: Poster

Montag, 16. März 2015, 15:00–20:00, Poster B

Hartree-Fock Ground State Phase Diagram of the Two-Dimensional Electron Gas with Spin-Orbit Interaction — •Akash Chakraborty, Paul Wenk, and John Schliemann — Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

The two-dimensional electron gas (2DEG) has served as a prototype for the understanding of electrons in solid state and condensed matter physics, such as in the quasi two-dimensional semiconductor heterostructures. However, the quantum mechanical many-body nature of these systems increases the complexities and the Hartree-Fock (HF) approximation plays a fundamental role in tackling this problem. Starting from the early works of Overhauser[1], the HF ground state of the 2DEG has been studied over the years but the effects of spin-orbit interaction have not been studied extensively. We calculate the ground state of the 2DEG within the HF approximation in the presence of Rashba and Dresselhaus spin-orbit coupling. Based on an earlier work[2], which included only the Rashba term, we try to identify two competing phases, a ferromagnetic one with partial out-of-plane polarization and a paramagnetic one with in-plane spin. A phase diagram in terms of the electron density and the relative intensities of the spin-orbit couplings with respect to the Coulomb interaction is also presented.

[1] A. W. Overhauser, Phys. Rev. Lett. 4, 462 (1960); Phys. Rev. 128, 1437 (1962).

[2] L. O. Juri and P. I. Tamborenea, Phys. Rev. B 77, 233310 (2008).