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AUGER-SPECTRA OF 3D TRANSITION-METALS WITH ORBITAL DEGENERACY
No full textThe equation of motion approach is employed to derive the two-body Green function. relevant for the calculation of Auger spectra, in the case of systems well described by the Hubbard Hamiltonian with many bands. The results have been used to calculate the Mlvv (M, valence-valence) Auger rate of copper, which has been shown to be well described by the present theory. as distinct contributions belonging to different bands are clearly present
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Boson-Fermion mixtures in Two-Color OpticalDipole Traps
Full text linkWe propose the use of a combined optical dipole trap to achieve Fermi degeneracy by sympathetic cooling with a different bosonic species. Two far-detuned pairs of laser beams focused on the atomic clouds are used to confine the two atomic species with different trapping strengths. We show that a deep Fermi degeneracy regime can be potentially achieved earlier than Bose-Einstein condensation, as discussed in the favorable situation of a {sup 6}L i-{sup 23}Na mixture. This opens up the possibility of experimentally investigating a mixture of superfluid Fermi and normal Bose gases
Cooling dynamics of ultracold two-species Fermi-Bose mixtures
No full textWe compare strategies for evaporative and sympathetic cooling of two-species Fermi-Bose mixtures in single-color and two-color optical dipole traps. We show that in the latter case a large heat capacity of the bosonic species can be maintained during the entire cooling process. This could allow one to efficiently achieve a deep Fermi degeneracy regime having at the same time a significant thermal fraction for the Bose gas, crucial for a precise thermometry of the mixture. Two possible signatures of a superfluid phase transition for the Fermi species are discussed
Reaching Fermi degeneracy in two-speciesoptical dipole traps
No full textWe propose the use of a combined optical dipole trap to achieve Fermi degeneracy by sympathetic cooling with a different bosonic species. Two far-detuned pairs of laser beams focused on the atomic clouds are used to confine the two atomic species with different trapping strengths. We show that a deep Fermi degeneracy regime can be potentially achieved earlier than Bose-Einstein condensation, as discussed in the favorable situation of a Li-6-Na-23 mixture. This opens up the possibility of experimentally investigating a mixture of superfluid Fermi and normal Bose gases
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