Stochastic growth dynamics and composite defects in quenched immiscible binary condensates

Liu, I-Kang; Pattinson, R. W.; Billam, Thomas P.; Gardiner, S. A.; Cornish, Simon L.; Huang, Tien‐Chi; Lin, Wen‐Wei; Gou, Shih-Chuan; Parker, N. G.; Proukakis, N. P.

doi:10.1103/physreva.93.023628

Cited by 33 publications

(29 citation statements)

References 76 publications

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“…The comparison of our experimental data with the full simulation in the preceding sections has shown that it is vital to appropriately include the initial gravitational sag between the two species. The role of trap sag has previously been theoretically investigated in [30,31], while the effect of temperature has been considered in [27,42,[48][49][50]. Figure 7 provides a more complete analysis of the effect of the sag on the COM position of the expanded partially condensed 39 K cloud.…”

Section: Effect Of the Gravitational Sagmentioning

confidence: 99%

Time-of-flight expansion of binary Bose–Einstein condensates at finite temperature

et al. 2018

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Ultracold quantum gases provide a unique setting for studying and understanding the properties of interacting quantum systems. Here, we investigate a multi-component system of 87 Rb-39 K Bose-Einstein condensates (BECs) with tunable interactions both theoretically and experimentally. Such multi-component systems can be characterized by their miscibility, where miscible components lead to a mixed ground state and immiscible components form a phase-separated state. Here we perform the first full simulation of the dynamical expansion of this system including both BECs and thermal clouds, which allows for a detailed comparison with experimental results. In particular we show that striking features emerge in time-of-flight (TOF) for BECs with strong interspecies repulsion, even for systems which were separated in situ by a large gravitational sag. An analysis of the centre of mass positions of the BECs after expansion yields qualitative agreement with the homogeneous criterion for phase-separation, but reveals no clear transition point between the mixed and the separated phases. Instead one can identify a transition region, for which the presence of a gravitational sag is found to be advantageous. Moreover, we analyse the situation where only one component is condensed and show that the density distribution of the thermal component also shows some distinct features. Our work sheds new light on the analysis of multi-component systems after TOF and will guide future experiments on the detection of miscibility in these systems.

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Section: Effect Of the Gravitational Sagmentioning

confidence: 99%

Time-of-flight expansion of binary Bose–Einstein condensates at finite temperature

et al. 2018

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“…Their phase separations were observed in spinor BECs of sodium in all hyperfine states of F=1 [13]. The advances in the experimental investigations with multi-component BECs have activated a large amount of theoretical descriptions applied to condensed mixtures having spatially segregated phases, by studying their properties related to static and dynamical stability [14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Miscibility in coupled dipolar and non-dipolar Bose–Einstein condensates

et al. 2017

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We perform a full three-dimensional study on miscible-immiscible conditions for coupled dipolar and non-dipolar Bose-Einstein condensates (BEC), confined in anisotropic traps. In view of recent experimental studies, our focus was the atomic erbium-dysprosium ( 168 Er-164 Dy) and dysprosiumdysprosium ( 164 Dy-162 Dy) mixtures. The miscibility is quantified by the overlap of the twocomponent densities, using an appropriate defined parameter. By verifying that stable regimes for pure-dipolar coupled BECs are only possible in pancake-type traps, we obtain some non-trivial local minimum biconcave-shaped states with density oscillations in both components. For non-dipolar systems with repulsive interactions, we show that immiscible stable configurations are also possible in cigar-type geometries. The main role of the trap aspect ratio and inter-species contact interaction for the miscibility is verified for different configurations, from non-dipolar to pure dipolar systems.

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“…[60][61][62] and Refs. [41,[63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78], respectfully. Notably, the SPGPE has been able to quantitatively describe experimental results, such as in Refs.…”

Section: Classical Field Methodologymentioning

confidence: 96%

Superflow decay in a toroidal Bose gas: The effect of quantum and thermal fluctuations

et al. 2021

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We theoretically investigate the stochastic decay of persistent currents in a toroidal ultracold atomic superfluid caused by a perturbing barrier. Specifically, we perform detailed three-dimensional simulations to model the experiment of Kumar et al. in [Phys. Rev. A 95 021602 (2017)], which observed a strong temperature dependence in the timescale of superflow decay in an ultracold Bose gas. Our ab initio numerical approach exploits a classical-field framework that includes thermal fluctuations due to interactions between the superfluid and a thermal cloud, as well as the intrinsic quantum fluctuations of the Bose gas. In the low-temperature regime our simulations provide a quantitative description of the experimental decay timescales, improving on previous numerical and analytical approaches. At higher temperatures, our simulations give decay timescales that range over the same orders of magnitude observed in the experiment, however, there are some quantitative discrepancies that are not captured by any of the mechanisms we explore. Our results suggest a need for further experimental and theoretical studies into superflow stability.

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Stochastic growth dynamics and composite defects in quenched immiscible binary condensates

Cited by 33 publications

References 76 publications

Time-of-flight expansion of binary Bose–Einstein condensates at finite temperature

Time-of-flight expansion of binary Bose–Einstein condensates at finite temperature

Miscibility in coupled dipolar and non-dipolar Bose–Einstein condensates

Superflow decay in a toroidal Bose gas: The effect of quantum and thermal fluctuations

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