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Updated: May 25, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Klein tunneling of a quasirelativistic Bose-Einstein condensate in an optical lattice
Tobias Salger1, Christopher Grossert, Sebastian Kling
1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany. salger@iap.uni-bonn.de
Abstract:
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 is reported. 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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