Postquench dynamics and prethermalization in a resonant Bose gas

Yin, Xiao; Radzihovsky, Leo

doi:10.1103/physreva.93.033653

Cited by 27 publications

(27 citation statements)

References 84 publications

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“…In order to predict contact dynamics from a three-body wave function, it is necessary to choose initial conditions such that Eqs. (10) and (11) matches the prepared manybody system under study. In this work, we consider an ultracold Bose gas prepared as either a BEC or an ideal thermal Bose gas.…”

Section: A Initial Conditionsmentioning

confidence: 74%

Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas

et al. 2019

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We study the growth of two-and three-body correlations in an ultracold Bose gas quenched to unitarity. This is encoded in the dynamics of the two-and three-body contacts analyzed in this work. Via a set of relations connecting many-body correlations dynamics with few-body models, signatures of the Efimov effect are mapped out as a function of evolution time at unitarity over a range of atomic densities n. For the thermal resonantly interacting Bose gas, we find that atombunching leads to an enhanced growth of few-body correlations. These atom-bunching effects also highlight the interplay between few-body correlations that occurs before genuine many-body effects enter on Fermi timescales.

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Section: A Initial Conditionsmentioning

confidence: 74%

Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas

et al. 2019

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“…Our estimate of η is close to the predictions for a prethermal state in Refs. [22,24], but the exponential n k k 3 n has (to our knowledge) not been theoretically predicted. Explaining this experimental observation may require explicitly considering the quench away from unitarity.…”

mentioning

confidence: 76%

Universal prethermal dynamics of Bose gases quenched to unitarity

Eigen

Glidden

Lopes

et al. 2018

Nature

171

173

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“…Time-resolved studies of the single-particle momentum distribution in Ref. [13] revealed that the theoretically predicted prethermal state [14][15][16] transitions to steady state prior to being overcome by heating. Although * s.musolino@tue.nl these findings, combined with studies of loss dynamics in Refs.…”

Section: Introductionmentioning

confidence: 98%

Pair formation in quenched unitary Bose gases

2019

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We study a degenerate Bose gas quenched to unitarity by solving a many-body model including three-body losses and correlations up to second order. As the gas evolves in this strongly interacting regime, the buildup of correlations leads to the formation of extended pairs bound purely by manybody effects, analogous to the phenomenon of Cooper pairing in the BCS regime of the Fermi gas. Through fast sweeps away from unitarity, we detail how the correlation growth and formation of bound pairs emerge in the fraction of unbound atoms remaining after the sweep, finding quantitative agreement with experiment. We comment on the possible role of higher-order effects in explaining the deviation of our theoretical results from experiment for slower sweeps and longer times spent in the unitary regime. though these findings, combined with studies of loss dy-52 namics in Refs. [10-12], are consistent with the univer-53 sality hypothesis, a macroscopic population of Efimov 54 trimers was observed in Ref. [11]. Understanding the 55 role of the Efimov effect [17, 18] and dynamics of higher-56 order correlations [19-21] in the quenched unitary Bose 57 gas remains however an ongoing pursuit in the commu-58 nity. 59 60The difficulties of probing the system at unitarity re-61 quire that experiments return to the more stable and 62 better-understood weakly-interacting regime. During the 63 course of the experiment, we have to distinguish differ-64 ent types of atomic pairs: (i) pairs of atoms with op-65 posite momentum, analogous to Cooper pairs in Fermi 66 gases, (ii) embedded dimers at unitarity whose size is de-67 termined by the mean interparticle separation, and (iii) 68 specific ramp, we find a molecular fraction ∼ 10%, which 472 is compatible with the experimental estimate in Ref. [12]. 473 By comparing three values A = {0.28, 0.20, 0.18} to the 474 0.3 µs/G experimental data we find that A = 0.20 pro-475 vides the best fit of the experimental results over the full 476 range of t hold considered in this work. For the slower 6 477 µs/G ramp, we find that A = 0.20 gives good agreement 478 at early-times until roughly t hold 0.5t n . We discuss 479 possible sources of this discrepancy at longer t hold at the 480 conclusion of this section. 481 Our results for N free over a range of 1/R are com-482 pared against the experimental findings in Ref. [12] as 483 shown in Fig. 5. The results shown in Fig. 5 are at 484 fixed t hold = 1.9t n , nearing the limit of validity of our 485 model [see Sec. II A]. The intuitive picture, discussed 486 in Secs. II B, II C and illustrated in Fig. 2 provides a 487 way to understand our results particularly at this later 488 time where the bound pairs at unitarity play a dom-489 inant role [see Fig. 3]. For smaller ramp rates, the 490 largest values of N free shown in Fig. 5 result from the 491 fast-sweep projection occurring further away from unitar-492 ity where the overlap between embedded dimers (φ D (k)) 493 with molecules (φ * (k)) becomes minimal. We find good 494 agreement with experiment only ...

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Postquench dynamics and prethermalization in a resonant Bose gas

Cited by 27 publications

References 84 publications

Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas

Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas

Universal prethermal dynamics of Bose gases quenched to unitarity

Pair formation in quenched unitary Bose gases

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