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Multichannel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects
Názov Multichannel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects Aut.údaje G. M. Bruun, A. D. Jackson, Evgeni E. Kolomeitsev Autor Bruun G. M. (34%)
Spoluautori Jackson A. D. (33%)
Kolomeitsev Evgeni E. 1970- (33%)
Zdroj.dok. Physical Review A : covering atomic, molecular, and optical physics and quantum information. Vol. 71, no. 5 (2005), pp. 2713-2713. - Maryland : American Physical Society, 2005 Kľúč.slová atómová fyzika cold atoms T-matrix Jazyk dok. angličtina Krajina Spojené štáty Systematika 539.1 Anotácia A low-energy effective theory based on a microscopic multichannel description of the atom-atom interaction is derived for the scattering of alkali-metal atoms in different hyperfine states. This theory describes all scattering properties, including medium effects, in terms of the singlet and triplet scattering lengths and the range of the atom-atom potential and provides a link between a microscopic description of Feshbach scattering and more phenomenological approaches. It permits the calculation of medium effects on the resonance coming from the occupation of closed channel states. The examination of such effects is demonstrated to be of particular relevance to an experimentally important Feshbach resonance for 40K atoms. We analyze a recent rethermalization rate experiment on 40K and demonstrate that a measurement of the temperature dependence of this rate can determine the magnetic moment of the Feshbach molecule. Finally, the energy dependence of the Feshbach interaction is shown to introduce a negative effective range inversely proportional to the width of the resonance. Since our theory is based on a microscopic multichannel picture, it allows the explicit calculation of corrections to commonly used approximations such as the neglect of the effective range and the treatment of the Feshbach molecule as a point boson Kategória publikačnej činnosti ADC Číslo archívnej kópie 26412 Kategória ohlasu ZHU, Shangguo - TAN, Shina. Universality in s-wave and higher partial-wave Feshbach resonances : an illustration with a single atom near two scattering centers. In Physical review A. ISSN 1050-2947, 2013, vol. 87, no. 6, art. no. 063029.
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HE, Lianyi - HU, Hui - LIU, Xia-Ji. Two-band description of resonant superfluidity in atomic Fermi gases. In Physical review A. ISSN 1050-2947, 2015, vol. 91, no. 2, art. no. 023622.
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