Elimination of the Stark shift from the vibrational transition frequency of optically trapped174Yb6Li molecules

Abstract

Transition frequencies of cold molecules must be accurately evaluated to test the variance in the protonto-electron mass ratio. Measuring the X 2 (v,N) = (0,0) → (1,0) transition frequency of optically trapped 174 Yb 6 Li molecules is a promising method for achieving this goal. The Stark shifts induced by trap and probe (for the Raman transition) lasers are eliminated by choosing appropriate frequencies (magic frequencies) during the construction of the optical lattice. In the far-off resonance region, the Stark shift is found to be less than 10 −16 even when the laser frequencies are detuned from the magic frequencies by ∼1 MHz.

Scattering lengths in isotopologues of the RbYb system

“…The group at the University of Washington [21,22] sympathetically cooled Li atoms by collisions with ultracold Yb atoms below the Fermi temperature and estimated the magnitude of the scattering length. The same system was investigated by the group of Kyoto University [23,24] and the magnitude of the scattering length found for 6 Li 174 Yb confirmed the findings of Ivanov et al [21]. This system, contrary to Rb-Yb, is limited in its range of available scattering lengths because of the much smaller range of variation in reduced mass due to a much larger mass imbalance.…”

“…It is expected that further development of production techniques for ultracold molecular samples will find many extremely exciting applications, for example, in quantum information theory [2], quantum simulations of many-body physics [3], and high-precision measurements [4][5][6].…”

Test ofmp/mechanges using vibrational transitions in N2+

“…(8). By choosing the laser wavelength correctly, the contributions for the various excited states to the level shift cancel and thus the effect of the Raman laser on the transition frequency can be eliminated [19,20,29,33]. At this magic wavelength, only differential changes in the laser intensities may cause a shift of the transition frequency.…”

“…The measured molecular transition must be chosen by considering the sensitivity tom p /m e and achievable accuracy of the measurement. Several authors have presented molecular transition frequencies with sensitivity to m p /m e much higher than pure vibrational or rotational transition frequencies [15][16][17] [19,20]. These molecules can be potentially generated in large numbers from cold atoms through photoassociation or Feshbach resonances and may be trapped in optical traps.…”

Microwave state transfer and adiabatic dynamics of magnetically trapped polar molecules

“…Polar radicals behave in even richer fashions: topological crystals [15], half-integer vortices generated by conical intersections [16], and spin-dependent chemistry [17] have been predicted, and the utility of using magnetic fields to trap radicals while performing electricdipole-dependent studies has already been demonstrated [14,18,19]. Motivated by these predictions, several groups are pursuing the production of ultracold radicals such as RbSr [19,20] and LiYb [21].While the combination of electric and magnetic dipoles enables fascinating new phenomena, it also comes with substantial complications. In particular, simple linear Zeeman spectra are converted to tangles of interwoven avoided crossings by the application of remarkably small transverse electric fields.…”