Nonequilibrium dynamics of an ultracold dipolar gas

Sykes, Andrew G.; Bohn, John L.

doi:10.1103/physreva.91.013625

Cited by 18 publications

(31 citation statements)

References 76 publications

(181 reference statements)

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“…Our technique is more convenient than crossdimensional relaxation for measuring scattering length because it requires only a single experimental measurement to determine a at a given field. Cross-dimensional relaxation, by contrast, requires multiple measurements to extract a thermalization time as well as extensive numerical simulations when a strong dipolar interaction is present [30] [31].…”

Section: Strongly Dipolar Lanthanide Gases Such As Dy Andmentioning

confidence: 99%

Anisotropic Expansion of a Thermal Dipolar Bose Gas

et al. 2016

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We report on the anisotropic expansion of ultracold bosonic dysprosium gases at temperatures above quantum degeneracy and develop a quantitative theory to describe this behavior. The theory expresses the post-expansion aspect ratio in terms of temperature and microscopic collisional properties by incorporating Hartree-Fock mean-field interactions, hydrodynamic effects, and Boseenhancement factors. Our results extend the utility of expansion imaging by providing accurate thermometry for dipolar thermal Bose gases, reducing error in expansion thermometry from tens of percent to only a few percent. Furthermore, we present a simple method to determine scattering lengths in dipolar gases, including near a Feshbach resonance, through observation of thermal gas expansion.

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Section: Strongly Dipolar Lanthanide Gases Such As Dy Andmentioning

confidence: 99%

Anisotropic Expansion of a Thermal Dipolar Bose Gas

et al. 2016

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“…However, a more complete simulation, perhaps using the direct simulation Monte Carlo technique (DSMC) of Ref. [52], may yield a more accurate collision rate by taking into account all correlations between position, spin, and momentum. Additional consideration will be given to any contribution from the as yet unmeasured s-wave scattering length between the m F = −21/2 and m F = −19/2 states; this is beyond the scope of this present work.…”

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confidence: 99%

Long-Lived Spin-Orbit-Coupled Degenerate Dipolar Fermi Gas

2016

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We describe the creation of a long-lived spin-orbit-coupled gas of quantum degenerate atoms using the most magnetic fermionic element, dysprosium. Spin-orbit-coupling arises from a synthetic gauge field created by the adiabatic following of degenerate dressed states comprised of optically coupled components of an atomic spin. Because of dysprosium's large electronic orbital angular momentum and large magnetic moment, the lifetime of the gas is limited not by spontaneous emission from the light-matter coupling, as for gases of alkali-metal atoms, but by dipolar relaxation of the spin. This relaxation is suppressed at large magnetic fields due to Fermi statistics. We observe lifetimes up to 400 ms, which exceeds that of spin-orbit-coupled fermionic alkali atoms by a factor of 10-100, and is close to the value obtained from a theoretical model. Elastic dipolar interactions are also observed to influence the Rabi evolution of the spin, revealing an interacting fermionic system. The long lifetime of this weakly interacting spin-orbit-coupled degenerate Fermi gas will facilitate the study of quantum many-body phenomena manifest at longer timescales, with exciting implications for the exploration of exotic topological quantum liquids. arXiv:1605.03211v2 [cond-mat.quant-gas]

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“…We solve equation (4) numerically using a DSMC algorithm, details of which have been published in [45]. We use an initial condition corresponding to both spatial and momentum densities proportional to the probability distribution function,…”

Section: Many-body Considerations: Monte-carlo Simulationmentioning

confidence: 99%

“…The system is then divided into two halves, which propagate along the positive and negative x-axis, respectively. For a detailed account of the simulation method, we refer the reader to [45], which adjusts the original DSMC approach [48] into a version appropriate to dipolar gases. Similar methods have been employed in the study of ultracold gases, see for instance [49][50][51].…”

Section: Many-body Considerations: Monte-carlo Simulationmentioning

confidence: 99%

Anisotropic collisions of dipolar Bose–Einstein condensates in the universal regime

Burdick¹,

Sykes²,

Tang³

et al. 2016

New J. Phys.

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We report the measurement of collisions between two Bose-Einstein condensates with strong dipolar interactions. The collision velocity is significantly larger than the internal velocity distribution widths of the individual condensates, and thus, with the condensates being sufficiently dilute, a halo corresponding to the two-body differential scattering cross section is observed. The results demonstrate a novel regime of quantum scattering, relevant to dipolar interactions, in which a large number of angular momentum states become coupled during the collision. We perform Monte-Carlo simulations to provide a detailed comparison between theoretical two-body cross sections and the experimental observations.

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Nonequilibrium dynamics of an ultracold dipolar gas

Cited by 18 publications

References 76 publications

Anisotropic Expansion of a Thermal Dipolar Bose Gas

Anisotropic Expansion of a Thermal Dipolar Bose Gas

Long-Lived Spin-Orbit-Coupled Degenerate Dipolar Fermi Gas

Anisotropic collisions of dipolar Bose–Einstein condensates in the universal regime

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