Cold atoms in optical lattices :a Hamiltonian ratchet

Details Cold atoms in optical lattices :a Hamiltonian ratchet Cold atoms in optical lattices :a Hamiltonian ratchet

2002-03-19

arxiv.org/abs/physics/0203056v2

Physics

Atomic Physics

new version with typos corrected

Scientific paper

We investigate a new type of quantum ratchet which may be realised by cold atoms in a double-well optical lattice which is pulsed with unequal periods. The classical dynamics is chaotic and we find the classical diffusion rate $D$ is asymmetric in momentum up to a finite time $t_r$. The quantum behaviour produces a corresponding asymmetry in the momentum distribution which is 'frozen-in' by Dynamical Localisation provided the break-time $t^* > t_r$. We conclude that the cold atom ratchets require $Db/ \hbar \sim 1$ where b is a small deviation from period-one pulses.

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