Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.86: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

Controlled manipulations of fermionic doublon states in the Hubbard model — •Karsten Balzer and Martin Eckstein — Max Planck Research Department for Structural Dynamics, University of Hamburg (CFEL), Building 99, Luruper Chaussee 149, 22761 Hamburg, Germany

External fields can cause interesting phases and phase transitions in strongly correlated quantum systems [1-3].

In this contribution, we study the dynamics of the Hubbard model at strong coupling and show that a specifically tailored time-dependent electric field can separate a localized doublon into two electrons with a given lattice spacing and also to gradually move one or more doublons through the lattice without destroying the spaciotemporal coherence.

Furthermore, we demonstrate that the same mechanism can be used to create a charge-ordered state (of doublons) starting from a band insulator. This may be of importance for initial state preparations, manipulations and measurements in cold-atom experiments involving optical lattices.
[1] S. Sachdev, K. Sengupta and S.M. Girvin, Phys. Rev. B 66, 075128 (2002)
J. Simon, W.S. Bakr, R. Ma, M.E. Tai, P.M. Preiss and M. Greiner, Nature 472, 307 (2011)
Ph. Werner, N. Tsuji and M. Eckstein, Phys. Rev. B 86, 205101 (2012).