Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions

Croft, J. F.  E.; Balakrishnan, N.; Kendrick, B. K.

doi:10.1103/PhysRevA.96.062707

Title: Long-lived complexes and signatures of chaos in ultracold $K_{2}$ +Rb collisions

Journal Article · 18 December 2017 · Physical Review A

DOI: https://doi.org/10.1103/PhysRevA.96.062707 · OSTI ID:1524374

Croft, J. F. E. ^[1]; Balakrishnan, N. ^[1];

^[2]

Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Lifetimes of complexes formed during ultracold collisions are of current experimental interest as a possible cause of trap loss in ultracold gases of alkali-metal dimers. Microsecond lifetimes for complexes formed during ultracold elastic collisions of K₂ with Rb are reported, from numerically exact quantum-scattering calculations. Thermally averaged lifetimes are compared with those calculated using a simple density-of-states approach, which are shown to be reasonable. This validates the density-of-states approach and suggests that the formation of long-lived complexes is indeed the cause of observed experimental trap loss in ultracold alkali-metal-dimer systems. Long-lived complexes correspond to narrow scattering resonances which we examine for the statistical signatures of quantum chaos, finding that the positions and widths of the resonances are in good agreement with the Wigner-Dyson and Porter-Thomas distributions, respectively.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001; 20170221ER; AC52-06NA25396

OSTI ID:: 1524374

Alternate ID(s):: OSTI ID: 1413815

Report Number(s):: LA-UR-17-29347; PLRAAN

Journal Information:: Physical Review A, Vol. 96, Issue 6; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Title: Long-lived complexes and signatures of chaos in ultracold K 2 +Rb collisions

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