Coherent negative mobility of ultracold atoms in an optical lattice

Details Coherent negative mobility of ultracold atoms in an optical lattice Coherent negative mobility of ultracold atoms in an optical lattice

2012-02-23

arxiv.org/abs/1202.5174v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

The paradoxical response, when a system produces an output - current, flux or rotation - in the direction opposite to an applied bias or torque, seemingly contradicts Newton's second law. Nevertheless, such a response, termed absolute negative mobility, can occur in a system driven far out of thermal equilibrium. In earlier works, the presence of strong decoherence mechanisms was regarded as a prerequisite for negative mobility to appear. Here we report an experimental and theoretical study showing absolute negative mobility in a fully coherent quantum regime. Using a rubidium Bose-Einstein condensate loaded in a time-periodically modulated optical lattice, we observe a negative response from a coherent quantum system. The experimental results are explained in terms of eigenstates of a time-periodic Hamiltonian. Our findings open new possibilities for the control of quantum transport in the decoherence-free limit.

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