Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance

Junker, M.; Dries, D.; Welford, C.; Hitchcock, J.; Chen, Y. P.; Hulet, R. G.

doi:10.1103/physrevlett.101.060406

Cited by 95 publications

(106 citation statements)

References 41 publications

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“…For the intuitive scheme, coincident pulses (D = 0) are generally optimal for all magnetic fields, both the pulse width and one-photon detuning are optimized at each magnetic fields, but the twophoton detuning is again fixed to resonance in the weak case and Stark-shifted resonance in the strong case. Although we do not go into details, for both pulse schemes the optimized one-photon detuning is consistent with the expected [24,25] dispersive-like behavior.…”

Section: Numerical Detailssupporting

confidence: 63%

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Feshbach-resonant Raman photoassociation in a Bose-Einstein condensate

et al. 2011

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We model the formation of stable heteronuclear molecules via pulsed Raman photoassociation of a two-component Bose-Einstein condensate near a strong Feshbach resonance, for both counterintuitive and intuitive pulse sequencing. Compared to lasers alone, weak Raman photoassociation is enhanced by as much as a factor of ten (five) for a counterintuitive (intuitive) pulse sequence, whereas strong Raman photoassociation is barely enhanced at all-regardless of pulse sequence. Stronger intra-atom, molecule, or atom-molecule collisions lead to an expected decrease in conversion efficiency, but stronger ambient inter-atom collisions lead to an unexpected increase in the efficiency of stable molecule production. Numerical results agree reasonably with an analytical approximation.

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Section: Numerical Detailssupporting

confidence: 63%

“…As detailed previously [23][24][25], in the resonantinteraction model the Feshbach resonance effectively modifies the photoassociation interaction Ω R = Ω−ακ/ω and detuningν = ν R − iΓ R /2, where the effective detuning is ν R = δ − κ 2 /ω and the effective decay rate…”

Section: Quasicontinuum and Resonant-interaction Modelsmentioning

confidence: 97%

Feshbach-resonant Raman photoassociation in a Bose-Einstein condensate

et al. 2011

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“…However, OFR often suffers from rapid loss of atoms due to the light-induced inelastic collisions between atoms. Recently, optical lasers in combination with magnetic Feshbach resonances have been developed to modify the interatomic interaction in a Bose gas [8,9] atoms and have been shown to reduce the loss rate by an order of magnitude compared with the ordinary OFR in 87 Rb [8,10]. In this Letter, we demonstrate the realization of such a laser-controlled magnetic Feshbach resonance in a strongly interacting Fermi gas of 40 K atoms.…”

mentioning

confidence: 86%

Optical control of a magnetic Feshbach resonance in an ultracold Fermi gas

Wang

Huang

et al. 2013

Phys. Rev. A

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We use laser light near-resonant with a molecular bound-to-bound transition to control a magnetic Feshbach resonance in ultracold Fermi gases of 40 K atoms. The spectrum of excited molecular states is measured by applying a laser field that couples the ground Feshbach molecular state to electronically excited molecular states. Nine strong bound-to-bound resonances are observed below the 2 P 1/2 + 2 S 1/2 threshold. We use radio-frequency spectroscopy to characterize the laser-dressed bound state near a specific bound-to-bound resonance and show clearly the shift of the magnetic Feshbach resonance using light. The demonstrated technology could be used to modify interatomic interactions with high spatial and temporal resolutions in the crossover regime from a Bose-Einstein condensate (BEC) to a Bardeen-Cooper-Schrieffer (BCS) superfluid.PACS numbers: 05.30. Fk, 03.75.Hh, 03.75.Ss, The ability to control the strength of interatomic interactions has led to revolutionary progress in the field of ultracold atomic gases [1]. Magnetic-field-induced Feshbach resonance is one of the such powerful tools and has been used widely in atomic gases of alkali atoms to understand strong correlation of quantum many-body systems [1]. An alternative technique for tuning interatomic interactions is optical Feshbach resonance (OFR) [2,3], in which free atom pairs are coupled to an excited molecular state by laser field near a photoassociation resonance. OFR is particularly useful for controlling interatomic interactions in atomic gases of alkali earth atoms [4][5][6][7], because of the lack of magnetic structure in the ground state of these atoms. It also offers more flexible control on the interaction strength with high spatial and temporal resolutions, since the laser intensity can be varied on short length and time scales. However, OFR often suffers from rapid loss of atoms due to the light-induced inelastic collisions between atoms. Recently, optical lasers in combination with magnetic Feshbach resonances have been developed to modify the interatomic interaction in a Bose gas [8,9] atoms and have been shown to reduce the loss rate by an order of magnitude compared with the ordinary OFR in 87 Rb [8,10]. In this Letter, we demonstrate the realization of such a laser-controlled magnetic Feshbach resonance in a strongly interacting Fermi gas of 40 K atoms. Strongly interacting atomic Fermi gas is a clean and easily controllable system with rich and intriguing physical properties [11,12]. It provides a new platform for solving some challenging problems in condensed matter physics and for quantum simulating novel exotic quantum states of matter, such as the high-temperature superconductivity and BEC-BCS crossover [13]. Magnetic Feshbach resonance has already been shown to play a key role in exploring strongly interacting Fermi gases with balanced or imbalanced spin-populations, leading to the creation of molecules [14][15][16][17], realization of fermionic superfluidity [18][19][20][21][22] and discovery of fermionic universality [23][2...

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“…Here, B 0 is the position of the resonance where a diverges and changes sign, ∆ is the width of the resonance, and a bg is the background scattering length which characterizes the scattering properties away from the resonance. Particularly convenient atomic species for such experiments are cesium [91], lithium [92,93] and potassium [94,95], where several wide Feshbach resonances are easily accessible in experiments.…”

Section: Tunability Of Interactionsmentioning

confidence: 99%

Ultracold Atoms Out of Equilibrium

Langen

Geiger

Schmiedmayer

2015

Annu. Rev. Condens. Matter Phys.

327

316

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The relaxation of isolated quantum many-body systems is a major unsolved problem connecting statistical and quantum physics. Studying such relaxation processes remains a challenge despite considerable efforts. Experimentally, it requires the creation and manipulation of well-controlled and truly isolated quantum systems. In this context, ultracold neutral atoms provide unique opportunities to understand non-equilibrium phenomena because of the large set of available methods to isolate, manipulate and probe these systems. Here, we give an overview of the rapid experimental progress that has been made in the field over the last years and highlight some of the questions which may be explored in the future.

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Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance

Cited by 95 publications

References 41 publications

Feshbach-resonant Raman photoassociation in a Bose-Einstein condensate

Feshbach-resonant Raman photoassociation in a Bose-Einstein condensate

Optical control of a magnetic Feshbach resonance in an ultracold Fermi gas

Ultracold Atoms Out of Equilibrium

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