Differential scattering measurements from a collider for ultracold atoms

Kjærgaard, Niels; Mellish, A. S.; Wilson, Andrew

doi:10.1088/1367-2630/6/1/146

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…With the experimental realization of a BEC [1], the growth rate of a condensed fraction from thermal vapor was observed [6,7], and found to differ from a pure relaxation process. The quantum mechanical nature of cold atom scattering has been revealed through energetic BEC collisions [8][9][10]. Thermalization processes depend largely on the microscopic properties of the system involved, such as the s-wave scattering length.…”

Section: Introductionmentioning

confidence: 99%

Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas

et al. 2018

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We experimentally and numerically investigate thermalization processes of a trapped 87 Rb Bose gas, initially prepared in a non-equilibrium state through partial Bragg diffraction of a Bose-Einstein condensate (BEC). The system evolves in a Gaussian potential, where we observe the destruction of the BEC due to collisions, and subsequent growth of a new condensed fraction in an oscillating reference frame. Furthermore, we occasionally observe the presence of defects, which we identify as gray solitons. We simulate the evolution of our system using the truncated Wigner method and compare the outcomes with our experimental results.

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Section: Introductionmentioning

confidence: 99%

Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas

et al. 2018

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“…In addition to these naturally produced energetic atoms, it is also possible to externally shoot energetic atoms into an atomic gas in a controlled way and measure the momentum distribution of scattered atoms. Indeed, closely related experiments to collide two atomic clouds have been performed successfully for Bose gases [54][55][56][57][58][59][60][61] and strongly interacting Fermi gases [23][24][25], which have been analyzed theoretically [62][63][64][65].…”

Section: Introductionmentioning

confidence: 99%

Probing strongly interacting atomic gases with energetic atoms

Nishida

2012

Phys. Rev. A

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We investigate properties of an energetic atom propagating through strongly interacting atomic gases. The operator product expansion is used to systematically compute a quasiparticle energy and its scattering rate both in a spin-1/2 Fermi gas and in a spinless Bose gas. Reasonable agreement with recent quantum Monte Carlo simulations even at a relatively small momentum k/kF>1.5 indicates that our large-momentum expansions are valid in a wide range of momentum. We also study a differential scattering rate when a probe atom is shot into atomic gases. Because the number density and current density of the target atomic gas contribute to the forward scattering only, its contact density (measure of short-range pair correlation) gives the leading contribution to the backward scattering. Therefore, such an experiment can be used to measure the contact density and thus provides a new local probe of strongly interacting atomic gases.Comment: 35 pages, 11 figures; (v4) published with the new titl

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“…Indeed, our main motivation was to develop a theory capable of describing the ultracold-atom collider developed by the Otago group [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Direct simulation Monte Carlo method for cold-atom dynamics: Classical Boltzmann equation in the quantum collision regime

2011

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In this paper, we develop a direct simulation Monte Carlo method for simulating highly nonequilibrium dynamics of nondegenerate ultracold gases. We show that our method can simulate the high-energy collision of two thermal clouds in the regime observed in experiments [Thomas et al. Phys. Rev. Lett. 93, 173201 (2004)], which requires the inclusion of beyond s-wave scattering. We also consider the long-time dynamics of this system, demonstrating that this would be a practical experimental scenario for testing the Boltzmann equation and studying rethermalization.

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Differential scattering measurements from a collider for ultracold atoms

Cited by 19 publications

References 23 publications

Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas

Thermalization, condensate growth, and defect formation in an out-of-equilibrium Bose gas

Probing strongly interacting atomic gases with energetic atoms

Direct simulation Monte Carlo method for cold-atom dynamics: Classical Boltzmann equation in the quantum collision regime

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