Elementary excitations and their non-equilibrium dynamics in novel materials: From Mott insulators to unconventional superconductors

The project is situated in the quickly growing field of non-equilibrium physics. We will study the ultrafast dynamics of strongly correlated systems ranging from Mott insulators to unconventional superconductors. The aim is to understand the nature oft he interactions which dominate this dynamics and the relaxation in particular. Experimentally, time- and angle-resolved photo emission spectroscopy (tr-ARPES) will be employed. It is based on pumping the system to a highly excited state by short laser pulses and probing its subsequent time evolution by another laser. The effect of the initial temperature, the employed fluence of the pump pulse and the dependence on the concentration of charge carriers (doping) will be investigated.
Theoretically, we intend to reach a quantitative understanding of the ultrafast dynamics including therelaxation. Two issues will be pursued: (i)The excitation process on the time scale of fem to seconds by explicit simulation of the equations of motions on the mean-field level. (ii) The relaxation processes on the scale of picoseconds. For the latter, a quantum master equation approach will be used additionally. The theoretical studies will be based on different effective models comprising electronic, phononic and magnetic degrees depending on the relevant time (and thus energy) scale.

Antragsteller

Technische Universität Dortmund: Prof. Dr. Götz S. Uhrig (LS für Theoretische Physik I);
Universität Duisburg-Essen: Prof. Dr. Uwe Bovensiepen (Fakultät für Physik);
Ruhr-Universität Bochum: Prof. Dr. Ilya Eremin (Institut für Theoretische Physik III)

Förderlinie: Projektförderung
Fördersumme: 257.760 Euro
Laufzeit: 01.09.2011 – 31.08.2013

Ansprechspartner

Prof. Dr. Götz S. Uhrig
Technische Universität Dortmund
Fakultät Physik
Theoretische Physik I
Otto-Hahn-Str. 4
44227 Dortmund

Telefon: 0231-7553563
goetz.uhrig (at) tu-dortmund(dot)de