Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 64: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1

TT 64.9: Vortrag

Donnerstag, 10. März 2016, 11:45–12:00, H22

Slow relaxing electronic dynamics at the Mott transition — •Sharareh Sayyad and Martin Eckstein — Max Planck Institute for the Structure and Dynamics of Matter, University of Hamburg-CFEL, 22761 Hamburg, Germany

While electron thermalization in metals is usually very fast, we propose a slow-down of the electronic relaxation around the metal-insulator crossover regime. Using nonequilibrium slave-rotor dynamical mean field theory, we studied the one-band Hubbard model, weakly coupled to a dissipative bosonic bath. After a slow quench of the hopping amplitude, the relaxation starts from the bad metal and is headed to the good metal forming the quasiparticle. The timescale of the dynamics is dominated by the spinon equilibrium physics. The spinon evolution goes through a U-turn, governed by a nonmonotonous temperature dependence of the bandwidth in equilibrium. In companion to this evolution, the rotor is forming low-energy spectral weight. Although, before the turning point, the rotor is able to build up the spectral density, it takes time to go along with the spinon after the turn.