Binding energies ofL6ip-wave Feshbach molecules

Abstract

We present measurements of the binding energies of 6 Li p-wave Feshbach molecules formed in combinations of the |F = 1/2, mF = +1/2 (|1 ) and |F = 1/2, mF = −1/2 (|2 ) states. The binding energies scale linearly with magnetic field detuning for all three resonances. The relative molecular magnetic moments are found to be 113 ± 7 µK/G, 111 ± 6 µK/G and 118 ± 8 µK/G for the |1 −|1 , |1 −|2 and |2 −|2 resonances, respectively, in good agreement with theoretical predictions. Closed channel amplitudes and the size of the p-wave molecules are obtained theoretically from full closed-coupled calculations.

Experimental determination ofp-wave scattering parameters in ultracold6Li atoms

“…Since atoms are purely in the lowest energy state |1 , atomic loss is only due to three-body collisions. The vertical axis shows the fraction of atoms remaining after the 50 ms holding time, and the horizontal axis shows the magnetic field detuning from the p-wave Feshbach resonance at B res = 159.17(5) G [13][14][15][17][18][19]. B res was determined from the frequency to drive an RF transition from |1 to |2 at the Feshbach resonance magnetic field.…”

“…Since the enhancement of elastic collisions and strong inelastic collision losses are inextricably linked near a Feshbach resonance, it is necessary to determine precisely the pwave scattering parameters and find the optimum experimental conditions to realize p-wave superfluidity. In this paper, we report the experimental determination of the scattering parameters for the p-wave Feshbach resonance in a single component Fermi gas of 6 Li atoms in the lowest spin state at 159 G [13][14][15][17][18][19]. The magnetic-field dependence of the p-wave elastic scattering cross section is measured by a widely-used cross-dimensional relaxation method [23].…”

“…With precise control of experimental parameters and the capability of direct observation of the motions of single atoms through absorption imaging, we may be able to deepen our understanding of the microscopic mechanism of pair formation and the emergence of p-wave superfluidity in a strongly-interacting fermion system. However, strong inelastic collision losses near pwave Feshbach resonances have made the realization of a p-wave superfluid one of the biggest challenges in the field of trapped Fermi gases [13][14][15][16][17][18][19].…”

Two-body relaxation in a Fermi gas at a p -wave Feshbach resonance

“…In the large scattering volume limit, the effective range can be expressed in terms of scattering parameters from the pole of the scattering amplitude as k e = − 2 /(mV bg ∆Bδµ) [3], where δµ = k B × 111 µK/G is the relative magnetic moment between the molecular state and the atomic state [13] and the effective range is estimated to be k e ≈ 0.14a…”

“…In two dimensions, the vortices in the BCS topological phase of the p-wave superfluid with m l = ±1 trap quasiparticles that obey non-Abelian statistics [6] and may have potential applications to realize decoherence-free quantum information processing [7]. In the past, quantum gases of 40 K and 6 Li atoms have been intensively studied across p-wave Feshbach resonances to pursue the possibility of achieving a p-wave superfluid [8][9][10][11][12][13][14][15][16]. However, the observed lifetime of pwave Feshbach molecules so far has been found to be too short to perform conventional evaporative cooling in order to achieve quantum degeneracy [11,12].…”