Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 53: Transport: Topological Insulators 3 (jointly with TT, MA)

HL 53.11: Talk

Wednesday, March 28, 2012, 12:15–12:30, BH 334

A quantum dot in a quantum spin Hall edge: Interaction effects — •Carsten Timm — Technische Universität Dresden, Germany

The edge states of a quantum spin Hall system are topologically protected but can be gapped by a magnetic field. A quantum dot realized by two magnetic tunneling barriers in a quantum spin Hall edge is proposed and transport through this device is analyzed. The analysis goes beyond linear response and incorporates electron-electron interaction in a combination of Green-function and master-equation approaches. A partial recurrence of non-interacting behavior is found for strong interactions. The possibility of controlling the magnetization of the edge by a locally applied gate voltage is proposed.