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Abstract: We examine and explain the spatial emission patterns of ultracold excitedfermions in anisotropic trapping potentials in the presence of a spin polarisedFermi sea of ground state atoms. Due to the Pauli principle, the Fermi seamodifies the available phase space for the recoiling atom and thereby modifiesits decay rate and the probability of the emitted photon-s direction. We showthat the spatial anisotropies are due to an intricate interplay between Fermienergies and degeneracy values of specific energy levels and identify a regimein which the emission will become completely directional. Our results arerelevant for recent advances in trapping and manipulating cold fermionicsamples experimentally and give an example of a conceptually new idea for adirectional photon source.



Autor: Brian O'Sullivan, Thomas Busch

Fuente: https://arxiv.org/



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