Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Cold Atomic Gases

TT 7.7: Vortrag

Montag, 7. März 2016, 12:00–12:15, H18

Competition between spin-selective localization and antiferromagnetism of correlated lattice fermions — •Jan Skolimowski¹, Dieter Vollhardt², and Krzysztof Byczuk¹ — ¹Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warszawa, Poland — ²Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135, Augsburg, Germany

Following our recent investigation of the paramagnetic ground state of correlated lattice fermions subjected to spin-dependent randomness [1], we study the magnetic ground state phase diagram of the Anderson-Hubbard model with spin-dependent disorder. The model is solved on a bipartite lattice within the dynamical mean-field theory with geometrically averaged local density of states, which makes our approach sensitive to Anderson localization and magnetic long range order. We determined the phase diagram which shows four phases: antiferromagnetic insulator, paramagnetic metal, and two distinct antiferromagnetic spin-selective localized phases. Our results show that antiferromagnetism (AF) is suppressed more strongly at weak spin-dependent disorder, whereas for large disorder strengths AF is sustained for all interaction strengths.
J. Skolimowski, D. Vollhardt, K. Byczuk, PRB 92, 094202 (2015)