Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1 (jointly with DY)
TT 4.6: Vortrag
Montag, 16. März 2015, 11:00–11:15, H 0104
Time-dependent Gutzwiller wave function for the Hubbard model in nonequilibrium — •Marcus Kollar1 and Christian Gramsch1,2 — 1Theoretische Physik III, Universitität Augsburg — 2I. Institut für Theoretische Physik, Universität Hamburg
In previous studies the time-dependent Gutzwiller wave function (GWF) has been applied to the fermionic Hubbard model in nonequilibrium [1], using the Gutzwiller approximation which is known to become exact in the limit of infinite lattice dimension. As an alternative, we employ the variational formalism for the GWF which applies in arbitrary dimensions, recovering the dynamics obtained in Ref. [1]. We present results for the one-dimensional Hubbard model, for which exact evaluations of the GWF are available. In particular we find that the GWF captures the transient momentum distribution on short timescales [2].
[1] M. Schiró and M. Fabrizio, Phys. Rev. Lett. 105, 076401 (2010).
[2] S. A. Hamerla and G. S. Uhrig, Phys. Rev. B 87, 064304 (2013).