Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Quantum dynamics, decoherence and quantum information
DY 31.11: Vortrag
Freitag, 29. Februar 2008, 12:45–13:00, MA 004
Entanglement entropy in disordered and non-equilibrium systems — •Zoltán Zimborás1, Viktor Eisler2, Róbert Juhász3, and Ferenc Iglói3 — 1Theoretische Physik, Univerität des Saarlandes, Campus 1, D-66041 Saarbrücken, Germany — 2Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — 3Research Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary
The effects of non-equilibrium currents and quenched disorder on the entanglement properties of quantum spin chains are studied. For the investigated models, we find that the entanglement entropy of a block of spins is smaller in the ground state, than in a minimally excited non-equilibrium current-carrying pure steady state. We relate this finding to recent studies on the dynamics of entanglement entropy after a quench. For disordered models, we falsify a recent conjecture stating that the ground state entanglement entropy decreases due to disorder. We show both for aperiodically disordered couplings and for randomly disordered couplings with spatially correlation, that the ground state entanglement can either decrease and increase depending on the type of interaction and on the type of disorder.
References:
1) F. Iglói, R. Juhász, and Z. Zimborás, Europhysics Letters 79,
37001 (2007).
2) V. Eisler and Z. Zimborás, Phys. Rev. A 71, 042318 (2005).