Observation of dipolar splittings in high-resolution atom-loss spectroscopy of Li6 p -wave Feshbach resonances

Abstract

We report on the observation of dipolar splitting in 6 Li p-wave Feshbach resonances by highresolution atom-loss spectroscopy. The Feshbach resonances at 159 G and 215 G exhibit a doublet structure of 10 mG and 13 mG, respectively, associated with different projections of the orbital angular momentum. The observed splittings agree very well with coupled-channel calculations. We map out the temperature dependence of the atom-loss spectrum allowing us to extrapolate resonance positions and the corresponding widths to zero temperature. The observed dipolar splitting in fermionic lithium might be useful for the realization of the quantum phase transition between the polar and axial p-wave superfluid phases.

Collisional loss of one-dimensional fermions near a $p$-wave Feshbach resonance

“…We characterized the |1 − |1 p-wave Feshbach resonance in 3D and quasi-1D, by measuring atom loss as functions of B and τ . In the same 3D trap that we prepare the ultracold atoms, we find the onset of loss at B 3D =159.05(1) G, which agrees with the previous measurements of the location of this resonance in 3D [15,17] but differs with other measurements [19,35] by a few 10's of mG. We were not able to resolve the expected doublet feature arising from the dipole-dipole interaction [12,19,36] because of limitations of the field stability. As V L is increased, we observe a confinement-induced shift in the resonance field and broadening of the atom-loss feature, as shown in Fig.…”

“…These zero-modes have been observed in semiconducting nanowires [8], and are a promising candidate platform for fault-tolerant quantum computing [9,10]. p-Wave Feshbach resonances have been observed in 40 K [11][12][13] and 6 Li [14][15][16][17][18][19]. The severe atom losses associated with these resonances, however, have limited their usefulness.…”

Beyond Born-Oppenheimer approximation in ultracold atomic collisions

“…The data set for the 7 Li-6 Li molecule is small compared to that of both homonuclear molecules 7 Li-7 Li and 6 Li-6 Li, thus it could be not sufficiently significant for the above mentioned distinction. For Li 2 there exist also measurements of Feshbach resonances for the homonuclear cases, see the latest report by Gerken et al [34], but nothing on 7 Li-6 Li. Thus studies of Feshbach resonances of Li-Li would be very worth to investigate both homonuclear and heteronuclear beyond BO corrections.…”

Shape resonances in H$_2$ as photolysis reaction intermediates

“…Subsequently the shape resonances X(v, J): (7,21), (8,19), (9,17), (10,15) and (11,13) are probed in a precision measurement, with the narrowband PDA-laser detecting the Doppler-free F 1 Σ + g -X 1 Σ + g two-photon transition. In Fig.…”

“…Magnetic Feshbach resonances play an important role in the study of cold interacting Bose and Fermi gases, but experimental studies have been mainly limited to s-wave resonances. Recently, resonances for higher partial waves J = 0 have been observed [9][10][11], which must be characterized as of mixed Feshbach/shape resonance character. A detailed understanding of higher partial wave magnetic Feshbach resonances requires therefore a good understanding of shape resonances [12].…”