Feshbach resonances in an ultracoldLi7andRb87mixture

Observation of interspecies6Li-133Cs Feshbach resonances

“…We analyze the obtained resonances in a coupled channels (cc) calculation in a similar way to previous calculations on other alkaline systems (see, e.g., [19,27]), using the atomic parameters for Li and Cs as compiled by Arimondo et al [43]. Precise determination of FRs and scattering lengths relies on accurate potential curves for the a 3 Σ + and X 1 Σ + states of LiCs.…”

“…FRs between different alkaline species have been identified for a variety of Bose-Bose [18][19][20][21], Bose-Fermi mixtures [22][23][24][25][26][27][28] as well as for the Fermi-Fermi mixture of 6 Li-40 K [29]. While the broad intraspecies FRs in 133 Cs [30,31] and 6 Li [32][33][34][35][36] are well-explored, until * weidemueller@uni-heidelberg.de now, only little is known about the interspecies interaction properties of Li and Cs.…”

“…Such a system can directly be mapped to the Fröhlich polaron Hamiltonian [15][16][17], which describes the interaction of an electron gas with the charged lattice atoms in a crystal. As the excitations in a Bose-Einstein condensate represent the lattice phonons, a FR allows the precise adjustment of the modeled phonon-electron coupling strength α, thus allowing one to explore fundamental solid-state systems.FRs between different alkaline species have been identified for a variety of Bose-Bose [18][19][20][21] Cs were studied by means of thermalization measurements at zero magnetic field [40], however, the tunability of the interspecies scattering properties via tuning the magnetic field has yet remained unexplored. Here, we report on the observation of nineteen interspecies loss features in different spin channels of an optically trapped 6 Li -133 Cs mixture, by scanning a homogeneous magnetic field (Feshbach spectroscopy).…”

“…FRs between different alkaline species have been identified for a variety of Bose-Bose [18][19][20][21] Cs were studied by means of thermalization measurements at zero magnetic field [40], however, the tunability of the interspecies scattering properties via tuning the magnetic field has yet remained unexplored. Here, we report on the observation of nineteen interspecies loss features in different spin channels of an optically trapped 6 Li -133 Cs mixture, by scanning a homogeneous magnetic field (Feshbach spectroscopy).…”

Mimicking multichannel scattering with single-channel approaches

“…The potential curve V 0 (V 1 ) for the singlet (triplet) states of 6 Li-87 Rb in Born-Oppenheimer (BO) approximation were obtained using data from [40,41] and references therein. In [40] refined potential parameters such as the van der Waals and exchange coefficients, which we use in the following, were determined by a comparison of MC calculations with experimentally observed resonances. It is important to note that the MC approach considered in the present work is formulated in relative motion coordinates.…”