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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Quantum Information Systems, Quantum Coherence (jointly with SAMOP)

TT 29.10: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Different types of integrability and their relation to decoherence in central spin models — •Bjoern Erbe and John Schliemann — Department of Physics, University of Regensburg, 93040 Regensburg, Germany

In a large variety of nanostructures spins couple to a bath of other spin degrees of freedom. Important examples are given by semiconductor and carbon nanotube quantum dots, phosphorus donors in silicon, nitrogen vacancy centers in diamond and molecular magnets. Commonly such systems are described by so-called central spin models [1,2].

We present recent results on the relation between integrability and decoherence in central spin models with more than one central spin [3]. We show that there is a transition between integrability ensured by Bethe ansatz and integrability ensured by complete sets of commuting operators. This has a significant impact on the decoherence properties of the system, suggesting that it is not necessarily integrability or non-integrability which is related to decoherence, but rather its type or a change from integrability to non-integrability.
J. Schliemann, A. Khaetskii, and D. Loss, J. Phys.: Condens. Mat. 15, R1809 (2003).
W. A. Coish and J. Baugh, phys. stat. sol. B 246, 2203 (2009).
B. Erbe and J. Schliemann, Phys. Rev. Lett. 105, 177602 (2010).