2011/12/28 by A. V. Yulin, Yu. V. Bludov, V. V. Konotop +4 · 24 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Josephson effect #Lattice (music) #Nonlinear system #Physics #Plasma #Quantum mechanics #Scattering #Strong Light-Matter Interactions #Superconductivity #Superfluidity #Toroid #cond-mat.quant-gas #nlin.PS
paper · pdf · doi:10.1103/physreva.84.063638
published in Physical Review A 84(6) (American Physical Society)
openalex publication_date 2011/12/28 · arxiv created 2012/01/01 · arxiv updated 2012/01/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.