Zobrazeno 1 - 10
of 21
pro vyhledávání: '"S. M. M. Virtanen"'
Publikováno v:
Journal of Low Temperature Physics. 129:473-487
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
Autor:
S. M. M. Virtanen, Martti M. Salomaa
Publikováno v:
Computer Physics Communications. 142:391-395
We present an efficient computational method to solve selfconsistently the Bogoliubov–de Gennes equations of weak coupling superconductivity. As a function of system size, the scaling of the CPU time required by the scheme is shown to be preferable
Publikováno v:
Computer Physics Communications. 142:396-400
We compute using a microscopic mean-field theory the structure and the quasiparticle excitation spectrum of a dilute, trapped Bose–Einstein condensate penetrated by an axisymmetric vortex line. The Gross–Pitaevskii equation for the condensate and
Autor:
S. M. M. Virtanen, Martti M. Salomaa
Publikováno v:
Journal of Physics: Condensed Matter. 12:L147-L153
The electronic structure of domain walls in superconductors is computed as a function of temperature within Bogoliubov-de Gennes theory. We find a spontaneous interface transition at an ultralow temperature T* 10-2 T c , in which the self-consistent
Autor:
Martti M. Salomaa, S. M. M. Virtanen
Publikováno v:
Physical Review B. 60:14581-14584
Superconducting quasiparticle excitation spectra are computed for m times quantized flux lines using a self-consistent Bogoliubov--de Gennes approach. We find m discrete branches of bound-state solutions in the spectrum, corresponding to different va
Publikováno v:
Physical Review A. 76
We investigate theoretically the tunneling of a dilute Bose-Einstein condensate through a potential barrier. This scenario is closely related to recent experimental studies of condensates trapped in one-dimensional optical lattices. We derive analyti
The formation of vortices by topological phase engineering has been realized experimentally to create the first two- and four-quantum vortices in dilute atomic Bose-Einstein condensates [A. E. Leanhardt et al., Phys. Rev. Lett. 89, 190403 (2002)]. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0d6ef3a1c19460b91c92d860c787697
http://arxiv.org/abs/0706.1840
http://arxiv.org/abs/0706.1840
We study the energetic and dynamic stability of coreless vortices in nonrotated spin-1 Bose-Einstein condensates, trapped with a three-dimensional optical potential and a Ioffe-Pritchard field. The stability of stationary vortex states is investigate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4625a65df3fbba0621c22b48d1f0a66
We study stationary clusters of vortices and antivortices in dilute pancake-shaped Bose-Einstein condensates confined in nonrotating harmonic traps. Previous theoretical results on the stability properties of these topologically nontrivial excited st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68a5bee6c903dc2a79aa87d4736d8b61
Publikováno v:
Physical Review A. 74
Multiquantum vortices in dilute atomic Bose-Einstein condensates confined in long cigar-shaped traps are known to be both energetically and dynamically unstable. They tend to split into single-quantum vortices even in the ultralow temperature limit w