Excitations of a Superfluid in a 3D Optical Lattice

Details Excitations of a Superfluid in a 3D Optical Lattice Excitations of a Superfluid in a 3D Optical Lattice

2004-08-20

arxiv.org/abs/cond-mat/0408449v2

Phys. Rev. Lett. 93, 240402 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.240402

We prepare a Bose-Einstein condensed gas in a three-dimensional optical lattice and study the excitation spectrum of the superfluid phase for different interaction strengths. We probe the response of the system by modulating the depth of the optical lattice along one axis. The interactions can be controlled independently by varying the tunnel coupling along the other two lattice axes. In the weakly interacting regime we observe a small susceptibility of the superfluid to excitations, while for stronger interactions an unexpected resonance appears in the excitation spectrum. In addition we measure the coherent fraction of the atomic gas, which determines the depletion of the condensate.

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