BEC Dynamics with Fluctuations: Beyond HFB Approximation

Nonequilibrium dynamics of a Bose-Einstein condensate (BEC) dynamics with fluctuations was analyzed using nonequilibrium many-body approaches beyond the Hartree-Fock-Bogoliubov (HFB) approximation. Nonequilbrium dynamics of BEC was loaded in an optical lattice was described by the closed-time-path (...

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Detalles Bibliográficos
Autor principal: Calzetta, Esteban Adolfo
Publicado: 2004
Materias:
Approximation theory
Condensation
Convergence of numerical methods
Correlation methods
Green's function
Hamiltonians
Kinetic energy
Oscillations
Perturbation techniques
Superlattices
Multiparticle scattering
Optical lattices
Quantum theory
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1054660X_v14_n2_p318_Rey
http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Nonequilibrium dynamics of a Bose-Einstein condensate (BEC) dynamics with fluctuations was analyzed using nonequilibrium many-body approaches beyond the Hartree-Fock-Bogoliubov (HFB) approximation. Nonequilbrium dynamics of BEC was loaded in an optical lattice was described by the closed-time-path (CTP) functional formalism for two-particle irreducible (2PI) Green's function. It was observed that second-order 2PI approximations were able to capture the damping effects due to the multiplarticle scattering in a systematic way. It was also observed that second-order 2PI approximation worked at intermediate times when correlations were not negligible and standard mean-field techniques.

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