Feshbach-resonant Raman photoassociation in a Bose-Einstein condensate

Abstract

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.

Ultracold Molecules Formed by Photoassociation: Heteronuclear Dimers, Inelastic Collisions, and Interactions with Ultrashort Laser Pulses

“…Enhanced photoassociation rates combined with initially dense ensembles of ultracold atoms may allow one to reach these regimes. Direct adiabatic population transfer from atomic double-species Bose–Einstein condensate into molecular Bose–Einstein condensate may be used − as demonstrated in a degenerate mixture between Rb atoms and molecules . Application of these methods to a mixture of different atomic species would allow one to reach the regime in which the dynamics are governed by the dipole–dipole and higher order multipole interactions.…”

Two-color laser modulation of magnetic Feshbach resonances

“…Table 1 shows the parameters used in the calculation for the 87 Rb which are taken from Ref. [22]. Figure 2 displays the imaginary part of scattering length as a function of the detuning ∆ e 1 and ∆ e 2 .…”

“…They demonstrated that a single-color laser light can not only noticeably shift an MFR but also reduce the rate of particle loss. Mackie [22,23] analyzed the role of quantum interference between magnetic and optical Fesh-bach resonances in cold atomic collision, and found that the quantum interference between photoassociation and Feshbach s-wave resonance could suppress inelastic and enhance the elastic scattering cross section. The improved quantum interference method was applied to the optical control with a wide tunability of scattering parameters.…”

Keeping up with the COVID's—Could siRNA‐based antivirals be a part of the answer?

“…[ 105 ] RSV, like COVID‐19 is a single‐stranded RNA virus and belongs to the Paramyxoviridae family that also includes mumps, measles, rabies, Ebola. [ 106 ] ALN‐RSV01 is designed by Alnylam, the company that successfully produced the first approved siRNA therapeutic, patisiran. ALN‐RSV01 was effective in early clinical trials and finished Phase II in 2018 (NCT00658086).…”