Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.4: Poster
Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B
Entanglement entropy dynamics in quantum impurity systems — •David Roosen1, Karyn Le Hur2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, J. W. Goethe-Universität, D-60438 Frankfurt, Germany — 2Department of Physics, Yale University, New Haven, CT 06520, USA
Studying entanglement entropy in quantum many body systems has become interesting for quantum information science, where entanglement is the main source of speed-up in quantum computers, and for condensed matter theory, due to its role as a non-classical correlation in quantum phase transitions (for a recent review, see [1]).
In earlier publications the entanglement between a localized spin and a bosonic bath has been studied [2,3]. Here we investigate characteristic time-scales where the quantum impurity system becomes entangled, as well as universality of the short-time dynamics. Specifically we analyze the real-time dynamics of entanglement entropy in the anisotropic Kondo model, applying a time-dependent Numerical Renormalization Group (NRG) algorithm [4].
[1] L. Amico, R. Fazio, A. Osterloh, and V. Vedral, quant-phys/0703044.
[2] K. Le Hur, P. Doucet-Beaupré, and W. Hofstetter, Phys. Rev. Lett. 99, 126801 (2007).
[3] A. Kopp, and K. Le Hur, Phys. Rev. Lett. 98, 220401 (2007).
[4] F. Anders, and A. Schiller, Phys. Rev. Lett. 95, 196801 (2005).