Optical Feshbach resonances through a molecular dark state: Efficient manipulation ofp-wave resonances in fermionicYb171atoms

Abstract

In a recent experiment by Yamazaki et al. [Phys.Rev. A 87 010704 (R) (2013) ], p-wave optical Feshbach resonance in fermionic 171 Yb atoms using purely long-range molecular excited states has been demonstrated. We theoretically show that, if two purely long range excited states of 171 Yb are coupled to the ground-state continuum of scattering states with two lasers, then it is possible to significantly suppress photoassociative atom loss by a dark resonance in the excited states. We present a general theoretical framework for creating a dark state in electronically excited molecular potential for the purpose of increasing the efficiency of an optical Feshbach resonance. This can be accomplished by properly adjusting the relative intensity, phase, polarizations and frequency detunings of two lasers. We present selective numerical results on atom loss spectra, p-wave elastic and inelastic scattering cross sections of 171 Yb atoms to illustrate the effects of the molecular dark state on optical Feshbach resonance.

Photoassociative cooling and trapping of a pair of interacting atoms

“…For numerical illustration, we consider fermionic 171 Yb atoms which have p-wave PLR excited states that are recently used to demonstrate p-wave optical Feshbach resonance [63][64][65]. For these PLR molecular states, the projection Φ of the total angular momentum F = J + I on the internuclear axis is a good quantum number.…”

Quantum Information and Computation for Chemistry

“…The major challenge for the realization of this approach is the implementation of long-range hopping and repulsion interactions between arbitrary sites of the optical lattice. (Saha et al, 2014;Höfer et al, 2015). ansatz.…”

Creation and manipulation of bound states in the continuum with lasers: Applications to cold atoms and molecules

“…This means that this is an excited molecular dark state that is predicted to play an important role in suppression of photoassociative atom loss [23]. We call this dark state as A-type BIC.…”

“…This can be identified with the standard result that the population trapping occurs due to the "confluence" of coherences [22] at Fano minimum. When the quasibound state in ground-state potential is absent or the magnetic Feshbach resonance is turned off, the resulting effective Hamiltonian has a real eigenvalue when the corresponding eigenvector is an excited molecular dark state [23].…”