Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： By including the contribution of the thermal cloud in the Lagrangian of the condensate of a Bose gas, we extend the time-dependent variational method at zero temperature to study temperature-dependent low collective excitation modes. A Gaussian trial wave function of the condensate and a static distribution density of the thermal cloud are used and analytical expressions for temperature-dependent excitation frequencies obtained. Theoretical results are compared with measurements in the JILA and MIT experiments.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： Phase separation of two-component untrapped and trapped Bose gases at finite temperature is studied. Conditions for the stability of a homogeneous binary Bose gas mixture at finite temperature and the density profile of the trapped binary mixture are obtained. Our extended results include the known results for zero temperature.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： A Bose gas in an external potential is studied by means of the local density approximation. Analytical results are derived for the thermodynamic properties of an ideal Bose gas in a generic power-law trapping potential, and their dependence on the mutual interaction of atoms in the case of a non-ideal Bose gas.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： A Bose gas in an external potential is studied by means of the semiclassical approximation. Analytical results are derived for the energy of an interacting Bose gas in a generic power-law trapping potential. An expression for the chemical potential below the critical temperature is also obtained. The theoretical results are in agreement with a recent energy measurement.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： The behavior of a trapped燼tomic爂as爑ndergoing a燘ose-Einstein燾ondensation爄s strongly influenced by the燼ttractive爄nteraction between particles. The role played by such燼n爄nteraction is analyzed by means of a variation method. The critical number of atoms for a metastable state to exist is determined, The aspect ratio of condensed bosons爄n燼n燼nisotropic trap, the loss rate of atoms, and the excitation spectrum are studied. The vortex state is discussed.
Peer Review Status:Awaiting Review
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties submitted time 2016-05-08
Abstract： The燘ose-Einstein爂as爄n燼n external potential is studied by means爋f爐he爈ocal-density燼pproximation. An analytical result is derived for爐he燿ependence爋fthe燾ritical爐emperature爋f燘ose-Einstein condensation on爐he爉utual interaction爄n燼爂eneric power-law potential.
Peer Review Status:Awaiting Review
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