Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 69: Other Low Temperature Topics: Cold Atomic Gases
TT 69.14: Vortrag
Mittwoch, 18. März 2015, 18:30–18:45, A 053
Anderson and Mott transitions in the presence of spin-dependent disorder — •Jan Skoliomwski1, Krzysztof Byczuk1, and Dieter Vollhardt2 — 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
Recent experiments with ultra-cold atoms in optical lattices [1] have caused us to investigate the phase diagram of correlated lattice fermions in the presence of spin-dependent disorder [2,3]. To this end we solved the Anderson-Hubbard model with a spin-dependent random potential within the dynamical mean-field theory, using the geometrically averaged local density of states to make the theory sensitive to Anderson localization [4]. The paramagnetic ground state phase diagram was determined. Spin-dependent disorder is seen to destabilize the metallic solution, in contrast to the usual case of spin-independent disorder [5]. For strong disorder above the critical point for the Mott transition novel spin-dependent localized phases are found.
[1] D. McKay and B. DeMarco, New J. Phys. 12, 055013 (2010).
[2] K. Makuch et al., New J. Phys. 15, 045031 (2013).
[3] R. Nanguneri et al., Phys. Rev. B 85, 134506 (2012).
[4] V. Dobrosavljevic et al., Europhys. Lett. 62, 76 (2003).
[5] K. Byczuket al., Phys. Rev. Lett. 94, 056404 (2005).