Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Transport: Quantum Coherence and Quantum Information
TT 44.5: Vortrag
Donnerstag, 26. März 2009, 15:00–15:15, HSZ 304
Spin dehoherence of a heavy hole coupled to nuclear spins in a quantum dot — •Jan Fischer1, William Anthony Coish1,2, Denis Bulaev1,3, and Daniel Loss1 — 1Department of Physics, University of Basel, Switzerland — 2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Ontario, Canada — 3Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District, Russia
We theoretically study the interaction of a heavy hole with nuclear spins in a quasi-two-dimensional III-V semiconductor quantum dot and the resulting dephasing of heavy-hole spin states. It has frequently been stated in the literature that heavy holes have a negligible interaction with nuclear spins. We show that this is not the case. In contrast, the interaction can be rather strong and will be the dominant source of decoherence in some cases. We also show that for unstrained quantum dots the form of the interaction is Ising-like, resulting in unique and interesting decoherence properties, which might provide a crucial advantage to using dot-confined hole spins for quantum information processing, as compared to electron spins.
[1] Jan Fischer, W. A. Coish, D. V. Bulaev, and Daniel Loss, Phys. Rev. B 78, 155329 (2008)