Interaction-Driven Dynamics of {sup 40}K-{sup 87}Rb Fermion-Boson Gas Mixtures in the Large-Particle-Number Limit

Journal Article · Fri Jan 20 04:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.020401· OSTI ID:20775027

Ospelkaus, C; Ospelkaus, S; Sengstock, K; Bongs, K ^[1]

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1. Institut fuer Laserphysik, Luruper Chaussee 149, 22761 Hamburg (Germany)

We have studied effects of interspecies attraction in a Fermi-Bose mixture over a large regime of particle numbers in the {sup 40}K-{sup 87}Rb system. We report on the observation of a mean-field driven collapse at critical particle numbers of 1.2x10{sup 6} {sup 87}Rb atoms in the condensate and 7.5x10{sup 5} {sup 40}K atoms consistent with mean-field theory for a scattering length of a{sub FB}=-284a{sub 0}. For large overcritical particle numbers, we see evidence for revivals of the collapse. Part of our detailed study of the decay dynamics and mechanisms is a measurement of the ({sup 87}Rb-{sup 87}Rb-{sup 40}K) three-body loss coefficient K{sub 3}=(2.8{+-}1.1)x10{sup -28} cm{sup 6}/s, which is an important parameter for dynamical studies of the system.

• OSTI ID: 20775027
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 96; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSE-EINSTEIN CONDENSATION
BOSONS
FERMIONS
MEAN-FIELD THEORY
MIXTURES
NUCLEAR DECAY
POTASSIUM 40
RUBIDIUM 87
SCATTERING LENGTHS
THREE-BODY PROBLEM