Photoinduced Two-Body Loss of Ultracold Molecules

Christianen, Arthur; Zwierlein, Martin; Groenenboom, Gerrit C.; Karman, Tijs

doi:10.1103/physrevlett.123.123402

Cited by 128 publications

(160 citation statements)

References 41 publications

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“…The average time for laser excitation of the complex at this intensity is < 100 ns. This is three orders of magnitude smaller than τ c , confirming the prediction [51] that k l I(t) 1/τ c and validating our earlier assumption. For a CW trap, the photoinduced loss is therefore highly saturated, and the depth would need to be reduced to ∼nK for an observable change in the loss rate.…”

supporting

confidence: 90%

“…2(b) and (c). Here we assume k l I(t) 1/τ c when the trap light is on, as predicted [51]. The suppression of loss depends strongly upon the ratio of the complex lifetime to the dark time, τ c /t dark ; the dark time must be sufficiently long that a significant number of complexes can form and dissociate back to RbCs molecules between the destructive laser pulses.…”

mentioning

confidence: 97%

“…However, recent work indicates that the density of states was over-estimated by Mayle et al, leading to complex lifetimes that are 2 to 3 orders of magnitude too large [49,50]. Specifically, Christianen et al have estimated the rate of (NaK) 2 +NaK complex-molecule collisions [51], and find that for typical experimental densities, the lifetime associated with this rate is significantly longer than τ c . They conclude that complex-molecule collisions are unlikely to be the cause of loss.…”

mentioning

confidence: 99%

“…Christianen et al instead propose that complexes may be removed via electronic excitation by the trapping light [51], as depicted schematically in Fig. 1(a).…”

mentioning

confidence: 99%

“…The average time for laser excitation of the complex is expected to be 2 to 3 orders of magnitude shorter than τ c [51]. Photoinduced loss of complexes may therefore be highly saturated, such that orders of magnitude reduction of the trap intensity is necessary to observe an intensity dependence.…”

mentioning

confidence: 99%

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Loss of Ultracold Rb87Cs133 Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes

et al. 2020

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We show that the lifetime of ultracold ground-state 87 Rb 133 Cs molecules in an optical trap is limited by fast optical excitation of long-lived two-body collision complexes. We partially suppress this loss mechanism by applying square-wave modulation to the trap intensity, such that the molecules spend 75% of each modulation cycle in the dark. By varying the modulation frequency, we show that the lifetime of the collision complex is 0.53 ± 0.06 ms in the dark. We find that the rate of optical excitation of the collision complex is 3 +4 −2 × 10 3 W −1 cm 2 s −1 for λ = 1550 nm, leading to a lifetime of < 100 ns for typical trap intensities. These results explain the two-body loss observed in experiments on nonreactive bialkali molecules.

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supporting

confidence: 90%

mentioning

confidence: 97%

mentioning

confidence: 99%

“…Christianen et al instead propose that complexes may be removed via electronic excitation by the trapping light [51], as depicted schematically in Fig. 1(a).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Loss of Ultracold Rb87Cs133 Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes

et al. 2020

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Losses, Many‐Body Correlations, and Universality in Ultracold Molecules

He¹,

Zhou

2022

Adv Quantum Tech

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Recent experimental developments have allowed physicists to freeze molecules' motion down to an ultracold temperature regime where quantum effects become profound. Furthermore, each molecule can be precisely prepared at chosen internal states and the mutual interactions between molecules are also highly tunable. As such, ultracold molecules have emerged as a powerful platform in multiple disciplines across physics and chemistry. Meanwhile, a grand challenge exists as to how losses of molecules depend on a quantum many-body environment. In this article, the recent experimental and theoretical progress of exploring losses of ultracold molecules is reviewed. Since the conventional theoretical scheme of treating isolated pairs of molecules is no longer applicable to the quantum degenerate regime that has been reached in recent experiments, an alternative framework of universal relations between two-body losses and many-body correlations has been established. Regardless of microscopic parameters ranging from the temperature and the particle number to the interaction strength, these universal relations always hold. This approach unfolds a simple universality behind complex loss processes of many-body systems and provides physicists and chemists with a new tool to explore ultracold molecules. OverviewThe realization of Bose-Einstein condensates in laboratories has brought physicists to an ultracold world in which intriguing quantum phenomena arise in a temperature regime down to a few nano-Kelvin. [1,2] In the past many years, a vast range of important quantum states and quantum phenomena have been accessed and explored in the field of quantum gases. [3][4][5][6][7][8][9][10][11][12] While the study of ultracold atoms continues to prosper, a new platform

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Ultracold $${ }^{88}\mathrm {Sr}_2$$ Molecules in the Absolute Ground State

Leung

2023

Springer Theses

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Photoinduced Two-Body Loss of Ultracold Molecules

Cited by 128 publications

References 41 publications

Loss of Ultracold Rb87Cs133 Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes

Loss of Ultracold Rb87Cs133 Molecules via Optical Excitation of Long-Lived Two-Body Collision Complexes

Losses, Many‐Body Correlations, and Universality in Ultracold Molecules

Ultracold $${ }^{88}\mathrm {Sr}_2$$ Molecules in the Absolute Ground State

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