Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1
TT 64.2: Vortrag
Donnerstag, 10. März 2016, 09:45–10:00, H22
Many-Body Localization in the central spin model — •Daniel Hetterich1, Maksym Serbyn2, Norman Yao2, Frank Pollmann3, and Björn Trauzettel1 — 1Institut für theoretische Physik, Universität Würzburg, Würzburg, Germany — 2Department of Physics, University of California, Berkeley, USA — 3Max-Plank-Insitut für Physik komplexer Systeme, Dresden, Germany
The periodic Heisenberg chain model obeys signatures of many-body localization (MBL) that persist the insertion of a central spin, which interacts with all other spins of the periodic chain. To support this statement, we present numerical results for the level repulsion of eigenvalues and for the growth of entanglement entropy of subsystems. We discuss why the central spin is not destroying the transition from the thermal phase to the localized phase. Surprisingly, local observables that measure the central spin only can be used to detect MBL within the whole system. Finally, more realistic modifications of our model are addressed by which we depict the experimental relevance of our results for quantum dots.