Normal state of highly polarized Fermi gases: Simple many-body approaches
Anno: 2007
Autori: Combescot R., Recati A., Lobo C., Chevy F.
Affiliazione autori: Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France;
Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy;
Laboratoire Kastler Brossel, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.
Abstract: We consider the problem of a single down arrow atom in the presence of a Fermi sea of up arrow atoms, in the vicinity of a Feshbach resonance. We calculate the chemical potential and the effective mass of the down arrow atom using two simple approaches: a many-body variational wave function and a T-matrix approximation. These two methods lead to the same results and are in good agreement with existing quantum Monte Carlo calculations performed at unitarity and, in one dimension, with the known exact solution. Surprisingly, our results suggest that, even at unitarity, the effect of interactions is fairly weak and can be accurately described using single particle-hole excitations. We also consider the case of unequal masses.
Giornale/Rivista: PHYSICAL REVIEW LETTERS
Volume: 98 (18) Da Pagina: 180402-1 A: 180402-4
Parole chiavi: polaron physics; fermi-fermi mixtures; DOI: 10.1103/PhysRevLett.98.180402Citazioni: 232dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-03-23Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
