Dynamics of symmetry broken states in the Hubbard model

Date

Aug 27, 2013

Time

2:30 PM - 3:15 PM

Speaker

Martin Eckstein

Language

en

Main Topic

Physik

Other Topics

Physik

Host

QSOE13

Description

Strong perturbations of the antiferromagnetic phase of the Hubbard model, e.g., by means of interaction quenches or photo-excitation, can induce a melting of the long-range order (LRO). However, even when the excitation density exceeds the energy that would be needed to heat the system above the Neel temperature, LRO can survive for very long times. For the Hubbard model at weak coupling, these long-lived states are related to the phenomenon of pre-thermalization, which was found earlier to occur after quenches in the paramagnetic phase. In this talk, we also address the crossover to the excitation regime in which LRO disappears already on fast timescales, within the pre-thermalized state. At the crossover between metastable states, signatures of non-thermal critical behavior become evident through a diverging timescale for melting of LRO, as well as through a softening of the amplitude mode oscillations. The results can be carried over to superconducting and charge-ordered states.

Last modified: Aug 27, 2013, 9:35:57 AM