Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.46: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Driven Topological Insulator Quantum Dot: A single-electron spin-source — •Andreas Inhofer and Dario Bercioux — Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, 79104 Freiburg, Germany

We use the concepts of scattering matrix theory and recent progress in theory and experiment on topological insulators in order to investigate the feasibility of a single-particle spin-source. The basic concept of such a device has been realized by Fève and coworkers as a single electron source (SES) in Ref. [1]. They used a driven quantum dot in a quantum Hall device to allow for the controlled emission of quantized charges into the edge-states of a quantum well. The conducting edge-states exhibit interesting features such as insensitivity to (strong) disorder, providing mainly dissipationless transport. However, these SES require high magnetic fields. Recently, spin-polarized edge-states were theoretically predicted and experimentally observed in two- and three-dimensional topological insulators in the absence of magnetic fields [2]. Such a source could provide quantized spin-currents and become one of the key components for spintronic devices. Further investigations involve the characterisation of the emitted spin-currents with respect to current-noise and entanglement of the counter-propagating electrons.
[1] G. Fève et al., Science 316, 1169 (2007)

[2] M. Z. Hasan and C. L. Kane, Rev. Mod. Phys. 82, 3045 (2010)