Scattering resonances in a degenerate Fermi gas

Abstract

We consider elastic single-particle scattering from a one-dimensional two-component trapped superfluid Fermi gas when the incoming projectile particle is identical to one of the confined species. Our theoretical treatment is based on the Hartree-Fock ground state of the trapped gas and a configuration-interaction description of the excitations. We determine the scattering phase shifts for the system and predict Fano-type scattering resonances that are a direct consequence of interatomic pairing. We describe the main characteristics of the scattering resonances and make a comparison with the results of BCS mean-field theory.

Complex and real unconventional Bose-Einstein condensations in high orbital bands

“…Considerable efforts have been made to study unconventional states of bosons both experimentally and theoretically. Among the most exciting achievements are the realizations of the meta-stable excited states of bosons in high orbital bands [4][5][6][7], which leads to the opportunity to the study of the UBECs [8][9][10][11][12][13][14][15], and other exotic properties [16][17][18][19][20][21]. Below are some recent experimental results.…”

Orbital optical lattices with bosons

“…Even in a simple square lattice potential with a monopartite unit cell the second band provides a rich structure of different Mott-insulator states, depending on the occupation [29,34,58,59]. For unity occupation the inclusion of super-exchange interactions is predicted to energetically favor alternating p x /p y orbital order [29], while for occupations above unity staggered angular momentum ordering is found [34].…”