Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Quantum Liquids, Miscellaneous 1
TT 9.3: Vortrag
Montag, 11. März 2013, 10:00–10:15, H21
Correlated lattice fermions in a spin-dependent random potential — •Karol Makuch1, Jan Skolimowski1, Prabuddha B. Chakraborty2, Krzysztof Byczuk1, and Dieter Vollhardt3 — 1Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, Hoza 69, 00-681 Warszawa, Poland — 2Indian Statistical Institute, Chennai Centre, SETS Campus, MGR Knowledge City, Taramani, Chennai 600113, India — 3Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135, Augsburg, Germany
Motivated by the new possibilities for experiments with ultracold atoms in optical lattices we explore the thermodynamic properties of correlated lattice fermions in the presence of an external spin-dependent random potential. The corresponding Hubbard model with the local on-site spin-dependent disorder is solved within the dynamical mean-field theory. The spin-dependent disorder is found to drive the magnetic polarization of the system when the total number of fermions is fixed. The magnetic response of the system with finite magnetization differs from that of a system with spin-independent disorder. The spin-dependence of the disorder also affects the metal-insulator transition at half filling.