Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Focus Session: Dynamics, Topology, and Fractionalisation

TT 16.1: Topical Talk

Montag, 31. März 2014, 15:00–15:30, HSZ 01

Dynamics in Heisenberg Chains: From Fractional Excitations to New Out-of-Equilibrium States of Matter — •Jean-Sébastien Caux — Institute for Theoretical Physics, University of Amsterdam, Science Park 904, Postbus 94485, 1090 GL Amsterdam, The Netherlands

The Heisenberg chain has long been a fertile laboratory for the investigation of strongly-correlated many-body quantum physics. The spin-1/2 Heisenberg model has been the theoretical paradigm of exactly-solvable (integrable) systems since Bethe wrote down its wavefunctions in 1931, but recent years have witnessed much progress on the theoretical understanding and experimental observation of its dynamical properties. This talk will review a number of recent results, focusing on the characterization and observation of fractional excitations in the vicinity of the ground state, and on the exotic situations which can occur when one puts the system strongly out of equilibrium, for example after a quantum quench.