Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Schweikhard V"'
We observe the proliferation of vortices in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional array of Josephson-coupled Bose-Einstein condensates. As long as the Josephson (tunneling) energy J exceeds the thermal energy T, the array is
Externí odkaz:
http://arxiv.org/abs/0704.0289
We report the observation of vortex pinning in rotating gaseous Bose-Einstein condensates (BEC). The vortices are pinned to columnar pinning sites created by a co-rotating optical lattice superimposed on the rotating BEC. We study the effects of two
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607697
Publikováno v:
Phys. Rev. A 74, 023623 (2006)
A Bose-Einstein condensate (BEC) is a quantum fluid that gives rise to interesting shock wave nonlinear dynamics. Experiments depict a BEC that exhibits behavior similar to that of a shock wave in a compressible gas, eg. traveling fronts with steep g
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603389
Publikováno v:
Phys. Rev. Lett. 93, 210403 (2004)
We observe interlaced square vortex lattices in rotating two-component dilute-gas Bose-Einstein condensates (BEC). After preparing a hexagonal vortex lattice in a single-component BEC in an internal state $|1>$ of $^{87}$Rb atoms, we coherently trans
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410237
Publikováno v:
Phys. Rev. Lett. 94, 080404 (2005)
Repulsive laser potential pulses applied to vortex lattices of rapidly rotating Bose-Einstein condensates create propagating density waves which we have observed experimentally and modeled computationally to high accuracy. We have observed a rich var
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407343
We characterize several equilibrium vortex effects in a rotating Bose-Einstein condensate. Specifically we attempt precision measurements of vortex lattice spacing and the vortex core size over a range of condensate densities and rotation rates. Thes
Externí odkaz:
http://arxiv.org/abs/cond-mat/0405240
We create rapidly rotating Bose-Einstein condensates in the lowest Landau level, by spinning up the condensates to rotation rates $\Omega>99%$ of the centrifugal limit for a harmonically trapped gas, while reducing the number of atoms. As a consequen
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308582
Publikováno v:
Phys.Rev.Lett.91:100402,2003
We directly image Tkachenko waves in a vortex lattice in a dilute-gas Bose-Einstein condensate. The low (sub-Hz) resonant frequencies are a consequence of the small but nonvanishing elastic shear modulus of the vortex-filled superfluid. The frequenci
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305008
We study the formation of large vortex aggregates in a rapidly rotating dilute-gas Bose-Einstein condensate. When we remove atoms from the rotating condensate with a tightly focused, resonant laser, the density can be locally suppressed, while fast c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0301532
Autor:
Schoser, J., Bataer, A., Loew, R., Schweikhard, V., Grabowski, A., Ovchinnikov, Yu. B., Pfau, T.
We present a 2D-MOT setup for the production of a continuous collimated beam of cold 87-Rb atoms out of a vapor cell. The underlying physics is purely two-dimensional cooling and trapping, which allows for a high flux of up to 6*10^(10) atoms/s and a
Externí odkaz:
http://arxiv.org/abs/physics/0201034