Zobrazeno 1 - 10
of 233
pro vyhledávání: '"Tozzo, C."'
The small oscillations of solitons in 2D Bose-Einstein condensates are investigated by solving the Kadomtsev-Petviashvili equation which is valid when the velocity of the soliton approaches the speed of sound. We show that the soliton is stable and t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607160
We theoretically investigate the dynamic properties of a Bose-Einstein condensate in a toroidal trap. A periodic modulation of the transverse confinement is shown to produce a density pattern due to parametric amplification of phonon pairs. By imagin
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605183
We consider a periodic vortex lattice in a rotating Bose-Einstein condensed gas, where the centrifugal potential is exactly compensated by the external harmonic trap. By introducing a gauge transformation which makes the Hamiltonian periodic, we solv
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509559
A Bose-Einstein condensate in an optical lattice exhibits parametric resonances when the intensity of the lattice is periodically modulated in time. These resonances correspond to an exponential growth of the population of counter-propagating Bogoliu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505625
We study the response of a Bose-Einstein condensate to a periodic modulation of the depth of an optical lattice. Using Gross-Pitaevskii theory, we show that a modulation at frequency Omega drives the parametric excitation of Bogoliubov modes with fre
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410122
Publikováno v:
Phys. Rev. A 70, 043625 (2004)
The occurrence of energetic and dynamical instabilities in a Bose-Einstein condensate moving in a one-dimensional (1D) optical lattice is analyzed by means of the Gross-Pitaevskii theory. Results of full 3D calculations are compared with those of an
Externí odkaz:
http://arxiv.org/abs/cond-mat/0405653
We study low momentum excitations of a Bose-Einstein condensate using a novel matter-wave interference technique. In time-of-flight expansion images we observe strong matter-wave fringe patterns. The fringe contrast is a sensitive spectroscopic probe
Externí odkaz:
http://arxiv.org/abs/cond-mat/0405222
We measure the response of an elongated Bose-Einstein condensate to a two-photon Bragg pulse. If the duration of the pulse is long, the total momentum transferred to the condensate exhibits a nontrivial behavior which reflects the structure of the un
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209075
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Akademický článek
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