Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Correlated Electrons: Low-dimensional Systems - Models
TT 24.17: Vortrag
Mittwoch, 27. Februar 2008, 18:30–18:45, H 2053
Spin-orbit coupling and electron correlations in quantum wires — •Jens Eiko Birkholz1 and Volker Meden2 — 1Institut für Theoretische Physik, Universität Göttingen, D- 37077 Göttingen, Germany — 2Institut für Theoretische Physik A, RWTH Aachen, D-52056 Aachen, Germany
We investigate the influence of the spin-orbit coupling on the transport properties of mesoscopic quantum wires. For a continuum model we discuss the effect of the spin-orbit interaction resulting from the lateral potential necessary to confine the two-dimensional electron gas, ocurring at a semiconductor hetero junction, to a quasi one-dimensional wire geometry. The spin polarization at a potential step in the presence of a magnetic field is analyzed. We introduce a lattice model which shows similar low-energy physics. For this lattice model we use the functional renormalization group method to investigate the role of the two-particle interaction (Coulomb interaction). The interplay of spin-orbit coupling, potential barriers, and electron correlations leads to interesting phenomena in the low-energy physics regime.