Artículos de revistas
Nonlinear Schrodinger equation for a superfluid Bose gas from weak coupling to unitarity: Study of vortices
Fecha
2008-03-01Registro en:
Physical Review A. College Pk: Amer Physical Soc, v. 77, n. 3, p. 10, 2008.
1050-2947
10.1103/PhysRevA.77.033618
WOS:000254541100182
WOS000254541100182.pdf
8031087349809439
Autor
Universidade Estadual Paulista (Unesp)
Univ Padua
Institución
Resumen
We introduce a nonlinear Schrodinger equation to describe the dynamics of a superfluid Bose gas in the crossover from the weak-coupling regime, where an(1/3)<<1 with a the interatomic s-wave scattering length and n the bosonic density, to the unitarity limit, where a ->+infinity. We call this equation the unitarity Schrodinger equation (USE). The zero-temperature bulk equation of state of this USE is parametrized by the Lee-Yang-Huang low-density expansion and Jastrow calculations at unitarity. With the help of the USE we study the profiles of quantized vortices and vortex-core radius in a uniform Bose gas. We also consider quantized vortices in a Bose gas under cylindrically symmetric harmonic confinement and study their profile and chemical potential using the USE and compare the results with those obtained from the Gross-Pitaevskii-type equations valid in the weak-coupling limit. Finally, the USE is applied to calculate the breathing modes of the confined Bose gas as a function of the scattering length.