Zobrazeno 1 - 10
of 126
pro vyhledávání: '"Beugnon, J."'
A gas of ultracold atoms probed with laser light is a nearly-ideal experimental realization of a medium of resonant point-like scatterers, a key problem from condensed matter to biology or photonics. Yet, several recent experiments have reported larg
Externí odkaz:
http://arxiv.org/abs/2409.04148
Autor:
Chauveau, G., Maury, C., Rabec, F., Heintze, C., Brochier, G., Nascimbene, S., Dalibard, J., Beugnon, J., Roccuzzo, S. M., Stringari, S.
Publikováno v:
Phys. Rev. Lett. 130 226003 (2023)
At zero temperature, a Galilean-invariant Bose fluid is expected to be fully superfluid. Here we investigate theoretically and experimentally the quenching of the superfluid density of a dilute Bose-Einstein condensate due to the breaking of translat
Externí odkaz:
http://arxiv.org/abs/2302.01776
Autor:
Maury, C., Bakkali-Hassani, B., Chauveau, G., Rabec, F., Nascimbene, S., Dalibard, J., Beugnon, J.
Cold quantum gases, when acted upon by electromagnetic fields, can give rise to samples where isolated atoms coexist with dimers or trimers, which raises the question of the interactions between these various constituents. Here we perform microwave p
Externí odkaz:
http://arxiv.org/abs/2211.05049
Publikováno v:
New J. Phys 25 013007 (2023)
When two Bose-Einstein condensates -- labelled 1 and 2 -- overlap spatially, the equilibrium state of the system depends on the miscibility criterion for the two fluids. Here, we theoretically focus on the non-miscible regime in two spatial dimension
Externí odkaz:
http://arxiv.org/abs/2207.06939
Autor:
Bakkali-Hassani, B., Maury, C., Zou, Y. -Q., Cerf, É. Le, Saint-Jalm, R., Castilho, P. C. M., Nascimbene, S., Dalibard, J., Beugnon, J.
Publikováno v:
Phys. Rev. Lett. 127, 023603 (2021)
Most experimental observations of solitons are limited to one-dimensional (1D) situations, where they are naturally stable. For instance, in 1D cold Bose gases, they exist for any attractive interaction strength $g$ and particle number $N$. By contra
Externí odkaz:
http://arxiv.org/abs/2103.01605
Autor:
Zou, Y. -Q., Cerf, É. Le, Bakkali-Hassani, B., Maury, C., Chauveau, G., Castilho, P. C. M., Saint-Jalm, R., Nascimbene, S., Dalibard, J., Beugnon, J.
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 54 08LT01 (2021)
We demonstrate the arbitrary control of the density profile of a two-dimensional Bose gas by shaping the optical potential applied to the atoms. We use a digital micromirror device (DMD) directly imaged onto the atomic cloud through a high resolution
Externí odkaz:
http://arxiv.org/abs/2102.05492
Autor:
Zou, Y. -Q., Bakkali-Hassani, B., Maury, C., Cerf, É. Le, Nascimbene, S., Dalibard, J., Beugnon, J.
Publikováno v:
Nat. Commun. 12, 760 (2021)
Tan's contact is a quantity that unifies many different properties of a low-temperature gas with short-range interactions, from its momentum distribution to its spatial two-body correlation function. Here, we use a Ramsey interferometric method to re
Externí odkaz:
http://arxiv.org/abs/2007.12385
Autor:
Zou, Y. -Q., Bakkali-Hassani, B., Maury, C., Cerf, É. Le, Nascimbene, S., Dalibard, J., Beugnon, J.
Publikováno v:
Phys. Rev. Lett. 125, 233604 (2020)
In atomic systems, clock states feature a zero projection of the total angular momentum and thus a low sensitivity to magnetic fields. This makes them widely used for metrological applications like atomic fountains or gravimeters. Here, we show that
Externí odkaz:
http://arxiv.org/abs/2007.12389
Autor:
Aguilera, M. Bosch, Bouganne, R., Dareau, A., Scholl, M., Beaufils, Q., Beugnon, J., Gerbier, F.
Publikováno v:
EPL (Europhysics Letters) 123, 40004 (2018)
We study the dynamics of a two-component Bose-Einstein condensate (BEC) of $^{174}$Yb atoms coherently driven on a narrow optical transition. The excitation transfers the BEC to a superposition of states with different internal and momentum quantum n
Externí odkaz:
http://arxiv.org/abs/1806.07210
Autor:
Ville, J. L., Saint-Jalm, R., Cerf, É. Le, Aidelsburger, M., Nascimbène, S., Dalibard, J., Beugnon, J.
Publikováno v:
Phys. Rev. Lett. 121, 145301 (2018)
In superfluid systems several sound modes can be excited, as for example first and second sound in liquid helium. Here, we excite propagating and standing waves in a uniform two-dimensional Bose gas and we characterize the propagation of sound in bot
Externí odkaz:
http://arxiv.org/abs/1804.04037