Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Magalhaes, K. M. F."'
Autor:
Caracanhas, Mônica, Fetter, Alexander L., Muniz, Sérgio R., Magalhães, K. M. F., Roati, G., Bagnato, G., Bagnato, Vanderlei S.
Publikováno v:
J Low Temp Phys (2012) 166: 49
In a recent study we demonstrated the emergence of turbulence in a trapped Bose-Einstein condensate of Rb-87 atoms. An intriguing observation in such a system is the behavior of the turbulent cloud during free expansion.The aspect ratio of the cloud
Externí odkaz:
http://arxiv.org/abs/1103.2039
Autor:
Romero-Rochin, V, Shiozaki, R F, Caracanhas, M, Henn, E A L, Magalhaes, K M F, Roati, G, Bagnato, V S
We measure the phase diagram of a $^{87}$Rb Bose gas in a harmonic trap in terms of macroscopic parameters obtained from the spatial distribution of atoms. Considering the relevant variables as size of the cloud ${\cal V}$, number of atoms $N$ and te
Externí odkaz:
http://arxiv.org/abs/1102.4642
Autor:
Seman, J. A., Henn, E. A. L., Shiozaki, R. F., Roati, G., Poveda-Cuevas, F. J., Magalhães, K. M. F., Yukalov, V. I., Tsubota, M., Kobayashi, M., Kasamatsu, K., Bagnato, V. S.
Publikováno v:
Laser Physics Letters 8, 691-696 (2011)
We have studied a Bose-Einstein condensate of $^{87}Rb$ atoms under an oscillatory excitation. For a fixed frequency of excitation, we have explored how the values of amplitude and time of excitation must be combined in order to produce quantum turbu
Externí odkaz:
http://arxiv.org/abs/1007.4953
Autor:
Pollack, S. E., Dries, D., Hulet, R. G., Magalhaes, K. M. F., Henn, E. A. L., Ramos, E. R. F., Caracanhas, M. A., Bagnato, V. S.
Publikováno v:
Phys. Rev. A 82, 020701(R) (2010) [4 pages]
We excite the lowest-lying quadrupole mode of a Bose-Einstein condensate by modulating the atomic scattering length via a Feshbach resonance. Excitation occurs at various modulation frequencies, and resonances located at the natural quadrupole freque
Externí odkaz:
http://arxiv.org/abs/1004.2887
We report on the experimental observation of vortex formation and production of tangled vortex distribution in an atomic BEC of Rb-87 atoms submitted to an external oscillatory perturbation. The oscillatory perturbations start by exciting quadrupolar
Externí odkaz:
http://arxiv.org/abs/0910.2729
Autor:
Paiva, R., Muhammad, R., Shiozaki, R., de Oliveira, A. L., Morizot, O., Bagnato, V. S., Magalhães, K. M. F.
Motivated by recent interest in low dimensional arrays of atoms, we experimentally investigated the way cold collisional processes are affected by the geometry of the considered atomic sample. More specifically, we studied the case of photoassociativ
Externí odkaz:
http://arxiv.org/abs/0907.5534
Autor:
Seman, J. A., Henn, E. A. L., Haque, M., Shiozaki, R. F., Ramos, E. R. F., Caracanhas, M., Branco, C. Castelo, Tavares, P. E. S., Poveda-Cuevas, F. J., Roati, G., Magalhães, K. M. F., Bagnato, V. S.
Publikováno v:
Published in Physical Review A 82, 033616 (2010)
We report on the creation of three-vortex clusters in a $^{87}Rb$ Bose-Einstein condensate by oscillatory excitation of the condensate. This procedure can create vortices of both circulation, so that we are able to create several types of vortex clus
Externí odkaz:
http://arxiv.org/abs/0907.1584
Publikováno v:
Phys. Rev. Lett. 103, 045301 (2009)
We report on the experimental observation of vortices tangle in an atomic BEC of Rb-87 atoms when an external oscillatory perturbation is introduced in the trap. The vortices tangle configuration is a signature of the presence of a turbulent regime i
Externí odkaz:
http://arxiv.org/abs/0904.2564
Autor:
Henn, E. A. L., Seman, J. A., Ramos, E. R. F., Caracanhas, M., Castilho, P., Olimpio, E. P., Roati, G., Magalhães, D. V., Magalhães, K. M. F., Bagnato, V. S.
Publikováno v:
Phys. Rev. A 79, 043618 (2009)
We report on the observation of vortex formation in a Bose-Einstein condensate of Rb-87 atoms. Vortices are generated by superimposing an oscillating excitation to the trapping potential introduced by an external magnetic field. For small amplitudes
Externí odkaz:
http://arxiv.org/abs/0806.0814
Autor:
Ramos, E. R. F., Henn, E. A. L., Seman, J. A., Caracanhas, M. A., Magalhães, K. M. F., Helmerson, K., Yukalov, V. I., Bagnato, V. S.
Publikováno v:
Phys. Rev. A 78, 063412 (2008)
A technique is proposed for creating nonground-state Bose-Einstein condensates in a trapping potential by means of the temporal modulation of atomic interactions. Applying a time-dependent spatially homogeneous magnetic field modifies the atomic scat
Externí odkaz:
http://arxiv.org/abs/0805.3083