Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 83: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems I

TT 83.7: Vortrag

Donnerstag, 3. April 2014, 11:30–11:45, HSZ 03

Thermalization timescales in a 1d Hubbard model with slightly broken integrability — •Fabian Biebl and Stefan Kehrein — Univ. Göttingen, Germany

Understanding relaxation in quantum systems is essential to determine whether an experimental setup can be described by equilibrium concepts. For example integrable systems do not thermalize, but develop into non-thermal steady states. By slightly breaking integrability, thermalization of such non-thermal (prethermalized) states becomes possible. An important question is to identify the corresponding timescale for thermalization due to the breaking of integrability.

We investigate this question for a fermionic Hubbard chain. The integrability breaking term is a small next to nearest neighbor hopping term [1,2]. The thermalization timescale is extracted from the quantum Boltzmann equation and depends strongly on temperature.
M. L. R. Fuerst et al., Phys. Rev. E 86, 031122 (2012)
M. L. R. Fuerst et al., Phys. Rev. E 88, 012108 (2013)