Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/21964
Título: | Superfuidity of Bose-Einstein condensates in toroidal traps with nonlinear lattices |
Autor(es): | Yulin, Alex V. Bludov, Yuliy V. Konotop, Vladimir V. Kuzmiak, Vladimir Salerno, Mario |
Palavras-chave: | Bose-Einstein condensate Superfluidity Optical lattice Nonlinear lattice |
Data: | 28-Dez-2011 |
Editora: | American Physical Society |
Revista: | Physical Review A |
Resumo(s): | Superfluid properties of Bose-Einstein condensates (BEC) in toroidal quasi-one-dimensional traps are investigated in the presence of periodic scattering length modulations along the ring. The existence of several types of stable periodic waves, ranging from almost uniform to very fragmented chains of weakly interacting and equally spaced solitons, is demonstrated.We show that these waves may support persistent atomic currents and sound waves with spectra of Bogoliubov type. Fragmented condensates can be viewed as arrays of Josephson junctions and the current as a BEC manifestation of the dc-Josephson effect. The influence of linear defects on BEC superfluidity has been also investigated.We found that for subcritical velocities, linear defects that are static with respect to the lattice (while the condensate moves in respect to both the optical lattice and the defect) preserve the BEC superfluidity. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/21964 |
DOI: | 10.1103/PhysRevA.84.063638 |
ISSN: | 1050-2947 |
Versão da editora: | http://link.aps.org/doi/10.1103/PhysRevA.84.063638 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Superfluid_arxiv.pdf | 754,43 kB | Adobe PDF | Ver/Abrir |