Loading of bosons in optical lattices into the p band

Details Loading of bosons in optical lattices into the p band Loading of bosons in optical lattices into the p band

2011-01-25

arxiv.org/abs/1101.4785v2

Phys. Rev. A 84, 023612 (2011)

Physics

Condensed Matter

Quantum Gases

8 pages, 7 figures

Scientific paper

10.1103/PhysRevA.84.023621

We present a method for transferring bosonic atoms residing on the lowest s-band of an optical lattice to the first excited p-bands. Our idea hinges on resonant tunneling between adjacent sites of accelerated lattices. The acceleration effectively shifts the quasi-bound energies on each site such that the system can be cast into a Wannier-Stark ladder problem. By adjusting the acceleration constant, a situation of resonant tunneling between the s- and p-bands is achievable. Within a mean-field model, considering 87Rb atoms, we demonstrate population transfer from the s- to the p-bands with around 95 % efficiency. Nonlinear effects deriving from atom-atom interactions, as well as coupling of the quasi bound Wannier-Stark states to the continuum, are considered.

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