Klein-Tunneling of a Quasirelativistic Bose-Einstein Condensate in an Optical Lattice

Details Klein-Tunneling of a Quasirelativistic Bose-Einstein Condensate in an Optical Lattice Klein-Tunneling of a Quasirelativistic Bose-Einstein Condensate in an Optical Lattice

2011-08-22

arxiv.org/abs/1108.4447v1

Phys. Rev. Lett. 107, 240401 (2011)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.240401

Optical lattices have proven to be powerful systems for quantum simulations of solid state physics effects. Here we report a proof-of-principle experiment simulating effects predicted by relativistic wave equations with ultracold atoms in a bichromatic optical lattice that allows for a tailoring of the dispersion relation. We observe the analog of Klein-tunneling, the penetration of relativistic particles through a potential barrier without the exponential damping that is characteristic for nonrelativistic quantum tunneling. Both linear (relativistic) and quadratic (nonrelativistic) dispersion relations are investigated, and significant barrier transmission is observed only for the relativistic case.

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