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

Wade, A. C. J.; Baillie, D.; Blakie, P. B.

doi:10.1103/physreva.84.023612

Cited by 29 publications

(41 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The test particles are binned into collision cells to determine possible collision partners. Because the density of the atom cloud can vary considerably, we use an adaptive cartesian grid in real space as outlined in [77], while keeping a global time step.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Evaporative cooling of cold atoms at surfaces

et al. 2014

View full text Add to dashboard Cite

We theoretically investigate the evaporative cooling of cold rubidium atoms that are brought close to a solid surface. The dynamics of the atom cloud are described by coupling a dissipative GrossPitaevskii equation for the condensate with a quantum Boltzmann description of the thermal cloud (the Zaremba-Nikuni-Griffin method). We have also performed experiments to allow for a detailed comparison with this model and find that it can capture the key physics of this system provided the full collisional dynamics of the thermal cloud are included. In addition, we suggest how to optimize surface cooling to obtain the purest and largest condensates.

show abstract

Section: Methodsmentioning

confidence: 99%

“…It is interesting to note that our ZNG method remains at least qualitatively correct even for this unusually warm starting state. It suggests that the primary limitations of the method are the simulation run time and the s-wave scattering approximation, which is valid up to approximately 100 µK [77].…”

Section: Distance Seriesmentioning

confidence: 99%

Evaporative cooling of cold atoms at surfaces

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The only available option would be to use a Monte Carlo method (see, e.g., Ref. [24]). Additionally we note that several realistic experiments have been modeled within the ergodic approximation and in general have found excellent agreement with the experimental data [18][19][20][21].…”

Section: A Model Overviewmentioning

confidence: 99%

Quantum kinetic theory model of a continuous atom laser

Dennis

Hope

2012

Phys. Rev. A

View full text Add to dashboard Cite

We investigate the feasible limits for realizing a continuously evaporated atom laser with high-temperature sources. A plausible scheme for realizing a truly continuous atom laser is to outcouple atoms from a partially condensed Bose gas while continuously reloading the system with noncondensed thermal atoms and performing evaporative cooling. Here we use quantum kinetic theory to model this system and estimate feasible limits for the operation of such a scheme. For sufficiently high temperatures, the figure of merit for the source is shown to be the phase-space flux. The dominant process limiting the usage of sources with low phase-space flux is the three-body loss of the condensed gas. We conclude that certain double-magneto-optical trap sources may produce substantial mean condensate numbers through continuous evaporation and provide an atom laser source with a narrow linewidth and reasonable flux.

show abstract

“…The use of optical fields means that atoms in any internal state can be explored in the collider, that collisions can take place in free space since the lasers can be switched off on a nanosecond timescale, and, crucially, magnetic bias fields can be applied to investigate magnetic Feshbach resonances. program we have also developed analysis methods where effects of multiple scattering are taken into account via direct simulation Monte Carlo (DSMC) modelling [21]. In these proceedings we present a summary of collision experiments that we have undertaken using our second-generation optical collider.…”

Section: Introductionmentioning

confidence: 99%

Quantum Scattering in an Optical Collider for Ultracold Atoms

Thomas

Chilcott

Chisholm

et al. 2017

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. We report on experiments investigating the collisional properties of atoms at ultralow collision energies using an all-optical atom collider. By using a pair of optical tweezers, we can manipulate two ultracold atom clouds and collide them together at energies up to three orders of magnitude larger than their thermal energy. Our experiments measure the scattering of 87 Rb, 40 K, and 40 K-87 Rb collisions. The versatility of our collider allows us to probe both shape resonances and Feshbach resonances in any partial wave. As examples, we present experiments demonstrating p-wave scattering with indistinguishable fermions, inelastic scattering at non-zero energies near a homonuclear Feshbach resonance, and partial wave interference in heteronuclear collisions.

show abstract

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

Cited by 29 publications

References 67 publications

Evaporative cooling of cold atoms at surfaces

Evaporative cooling of cold atoms at surfaces

Quantum kinetic theory model of a continuous atom laser

Quantum Scattering in an Optical Collider for Ultracold Atoms

Contact Info

Product

Resources

About