Dissipative Quantum Dynamics of Bosonic Atoms in a Shallow 1D Optical Lattice
Janne Ruostekoski, Lorenzo Isella
We theoretically study the dipolar motion of bosonic atoms in a very shallow, strongly confined 1D optical lattice using the parameters of the recent experiment [C. D. Fertig, Phys. Rev. Lett. 94, 120403 (2005)]. We find that, due to momentum uncertainty, a small, but non-negligible, atom population occupies the unstable velocity region of the corresponding classical dynamics, resulting in the observed dissipative atom transport. This population is generated even in a static vapor, due to quantum fluctuations which are enhanced by the lattice and the confinement, and is not notably affected by the motion of atoms or finite temperature.
arXiv:cond-mat/0504026•Physical Review Letters•Sep 8, 2005•59 citations