Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.32: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Comparison of dynamics in quantum impurity models with bosonic and fermionic baths — •David Roosen1, Karyn Le Hur2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt/Main, Germany — 2Department of Physics, Yale University, New Haven, CT 06520, USA
Equivalence relations between quantum impurity models with bosonic and fermionic baths can be derived using the bosonization technique [1]. We focused on the well-known mapping between the anisotropic Kondo and the spin boson model (for a recent review on this model see [2]) and investigated, to which degree this equivalence holds for general local observables, and whether it extends to nonequilibrium dynamics.
The dynamics of the two models are investigated using a time-dependent Numerical Renormalization Group (NRG) algorithm [3] developed recently. A detailed study of the time-dependent entanglement entropy, a measure of increasing importance due to its prominent role in numerous fields of physics ranging from quantum information science to quantum phase transitions in condensed matter systems [4], has been carried out.
[1] S. Chakravarty, Phys. Rev. Lett. 49, 681 (1982).
[2] K. Le Hur, Annals of Physics 323, 9, 2208, (2008).
[3] F. Anders, and A. Schiller, Phys. Rev. Lett. 95, 196801 (2005).
[4] L. Amico, R. Fazio, A. Osterloh, and V. Vedral, Rev. Mod. Phys. 80, 517 (2008).