Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Correlated Electrons: Quantum-Critical Phenomena – Theory
TT 56.14: Vortrag
Mittwoch, 18. März 2015, 13:00–13:15, A 053
Spin-orbit coupling in interacting quantum wires — •Nikolaos Kainaris1,2 and Sam T. Carr3 — 1Institut für Theorie der Kondensierten Materie, KIT Karlsruhe, Germany — 2Institut für Nanotechnologie, KIT Karlsruhe, Germany — 3School of Physical Sciences, University of Kent, Canterbury, United Kingdom
We present analysis of the interacting quantum wire problem in the presence of spin-orbital interaction. We find that the most generic model describing spin-orbit-coupling effects is a two band model with a difference in Fermi velocities δ v. This velocity difference destroys the spin-charge-separation and breaks the SU(2) symmetry in the low-energy Luttinger liquid theory. We show that electron-electron interactions then can open a gap in the spin sector of the theory when the interaction strength U is smaller than δ v in appropriate units. The resulting spin-density-wave (SDW) state has a number of interesting properties reminiscent of topological insulators. We show that the the SDW state is robust against non-magnetic disorder and has zero-energy edge modes localized at its boundary.