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Phys Rev Lett. 2008 Feb 8;100(5):056403. Epub 2008 Feb 6.

Mott transition of fermionic atoms in a three-dimensional optical trap.

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Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany.


We study theoretically the Mott metal-insulator transition for a system of fermionic atoms confined in a three-dimensional optical lattice and a harmonic trap. We describe an inhomogeneous system of several thousand sites using an adaptation of dynamical mean-field theory solved efficiently with the numerical renormalization group method. Above a critical value of the on-site interaction, a Mott-insulating phase appears in the system. We investigate signatures of the Mott phase in the density profile and in time-of-flight experiments.

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