Localization of cold atoms in state-dependent optical lattices via a Rabi pulse

Abstract

We propose a novel realization of Anderson localization in non-equilibrium states of ultracold atoms trapped in state-dependent optical lattices. The disorder potential leading to localization is generated with a Rabi pulse transfering a fraction of the atoms into a different internal state for which tunneling between lattice sites is suppressed. Atoms with zero tunneling create a quantum superposition of different random potentials, localizing the mobile atoms. We investigate the dynamics of the mobile atoms after the Rabi pulse for non-interacting and weakly interacting bosons, and we show that the evolved wavefunction attains a quasi-stationary profile with exponentially decaying tails, characteristic of Anderson localization. The localization length is seen to increase with increasing disorder and interaction strength, oppositely to what is expected for equilibrium localization.

arXiv comment4 pages, 4 figures

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• Controlling disorder with periodically modulated interactions
• Itinerant ferromagnetism of two-dimensional repulsive fermions with Rabi coupling
• Boosting entanglement growth of many-body localization by superpositions of disorder
• Tunable zero and first sounds in ultracold Fermi gases with Rabi coupling