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TT: Fachverband Tiefe Temperaturen

TT 9: Transport: Quantum Coherence and Quantum Information Systems

TT 9.9: Talk

Monday, February 25, 2008, 16:30–16:45, H 2053

Nuclear spin dynamics in quantum dots — •Daniel Klauser, William Anthony Coish, and Daniel Loss — Departement of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

The hyperfine interaction between the electron spin and the nuclear spins within a quantum dot has been established as the main source of decoherence for the electron spin. The decay of transverse and longitudinal spin components show rich dynamics including exponential, gaussian and power-law decay. Further, a universal phase-shift for driven single spin oscillations has been predicted and experimentally observed recently [1]. In this context of hyperfine induced electron spin decoherence also the dynamics of the nuclear spin system (Overhauser field dynamics) have come into focus. We discuss the dynamics of the nuclear spin system and how measurements of the Overhauser field [2] alter this dynamics.
F.H.L. Koppens, D. Klauser, W.A. Coish, K.C. Nowack, L.P. Kouwenhoven, D. Loss and L.M.K. Vandersypen, Phys. Rev. Lett. 99, 106803, (2007).
D. Klauser, W.A. Coish and Daniel Loss, Phys. Rev. B 73, 205302, (2006).