Zobrazeno 1 - 10
of 141
pro vyhledávání: '"Salomaa M"'
Publikováno v:
Phys. Rev. A 71, 023604 (2005)
We study the energies and decay of elementary excitations in weakly interacting Bose-Einstein condensates within a finite-temperature gapless second-order theory. The energy shifts for the high-lying collective modes turn out to be systematically neg
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502441
The complete low-energy collective-excitation spectrum of vortex lattices is discussed for rotating Bose-Einstein condensates (BEC) by solving the Bogoliubov-de Gennes (BdG) equation, yielding, e.g., the Tkachenko mode recently observed at JILA. The
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308010
Publikováno v:
Phys. Rev. A 68, 023611 (2003)
The stability of doubly quantized vortices in dilute Bose-Einstein condensates of 23Na is examined at zero temperature. The eigenmode spectrum of the Bogoliubov equations for a harmonically trapped cigar-shaped condensate is computed and it is found
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303256
Publikováno v:
J. Low Temp. Phys. 103, 473 (2002)
The formation of quantized vortices in trapped, gaseous Bose-Einstein condensates is considered. The thermodynamic stability of vortex states and the essential role of the surface excitations as a route for vortex penetration into the condensate are
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209051
Publikováno v:
Phys. Rev. A 66, 035601 (2002)
The surface mode spectrum is computed self-consistently for dilute Bose-Einstein condensates, providing the temperature dependence of the surface mode induced vortex nucleation frequency. Both the thermodynamic critical frequency for vortex stability
Externí odkaz:
http://arxiv.org/abs/cond-mat/0204177
Autor:
Virtanen, S. M. M., Salomaa, M. M.
We study the stability of vortices in trapped single-component Bose-Einstein condensates within self-consistent mean-field theories--especially we consider the Hartree-Fock-Bogoliubov-Popov theory and its recently proposed gapless extensions. It is s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0203257
Publikováno v:
Phys. Rev. A 65, 033614 (2002)
Multiply quantized vortices in trapped Bose-Einstein condensates are studied using the Bogoliubov theory. Suitable combinations of a localized pinning potential and external rotation of the system are found to energetically stabilize, both locally an
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109272
Publikováno v:
J. Phys.: Condens. Matter 13 (2001) L819-L824
We compute structures of vortex configurations in a harmonically trapped Bose-Einstein condensed atom gas within three different gapless self-consistent mean-field theories. Outside the vortex core region, the density profiles for the condensate and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108462
Considering a moving vortex line in a dilute atomic Bose-Einstein condensate within time-dependent Hartree-Fock-Bogoliubov-Popov theory, we derive a criterion for the quasiparticle excitations to follow the vortex core rigidly. The assumption of adia
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105398
We compute the structure of a quantized vortex line in a harmonically trapped dilute atomic Bose-Einstein condensate using the Popov version of the Hartree-Fock-Bogoliubov mean-field theory. The vortex is shown to be (meta)stable in a nonrotating tra
Externí odkaz:
http://arxiv.org/abs/cond-mat/0102035