Observation of broad 
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-wave Feshbach resonances in ultracold 
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 mixtures

Dong, Shikui; Cui, Yue; Shen, Chuyang; Wu, Yewei; Tey, Meng Khoon; You, Li; Gao, Bo

doi:10.1103/physreva.94.062702

Cited by 28 publications

(36 citation statements)

References 63 publications

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“…The predictive power of the analytic MQDT for nonzero partial-wave FRs has been proven by our previous observations of "broad" p-wave FRs in the 85 Rb and 87 Rb mixture [35]. With the discovery of the d-wave FRs in this Letter, the territory governed by the analytic MQDT is further expanded.…”

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confidence: 57%

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Observation of Broad d -Wave Feshbach Resonances with a Triplet Structure

et al. 2017

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High partial-wave (l≥2) Feshbach resonance (FR) in an ultracold mixture of ^{85}Rb-^{87}Rb atoms is investigated experimentally aided by a partial-wave insensitive analytic multichannel quantum-defect theory. Two "broad" resonances from coupling between d waves in both the open and closed channels are observed and characterized. One of them shows a fully resolved triplet structure with a splitting ratio well explained by the perturbation to the closed channel due to interatomic spin-spin interaction. These tunable "broad" d-wave resonances, especially the one in the lowest-energy open channel, could find important applications in simulating d-wave coupling dominated many-body systems. In addition, we find that there is generally a time and temperature requirement, associated with tunneling through the angular momentum barrier, to establish and observe resonant coupling in nonzero partial waves.

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“…The splitting of the bound states gives rise to a triplet FR structure when the open channel is also d-wave. previously [35]. In brief, the experiment starts with loading of both atomic isotopes into a magneto-optical trap (MOT).…”

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Observation of Broad d -Wave Feshbach Resonances with a Triplet Structure

et al. 2017

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“…B e ±1 (G) w e 0 (mG) w e ±1 (mG) δ e (mG) δ t (mG) |1 ⊕ |1 159.097(1)(10) 6(2) 17(2) 10(1) 10 |1 ⊕ |2 185.092(1)(10) 10(1) 10(1) -4 |2 ⊕ |2 214.825(1)(10) 7(2) 10(1) 13 (1) 13 tion [1,11,36,40,41]. Averaging over the Maxwell-Boltzmann distribution of the collision energy results in an asymmetric lineshape [1,35] shifting the resonance center and broadening the spectrum.…”

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confidence: 99%

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

et al. 2019

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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.

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“…Rb and 87 Rb mixture [35]. With the discovery of the d-wave FRs in this Letter, the territory governed by the analytic MQDT is further expanded.…”

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confidence: 88%

“…Rb atoms has been described previously [35]. In brief, the experiment starts with the loading of both atomic isotopes into a magneto-optical trap.…”

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confidence: 99%

Scattering Atoms Catch the d Wave

Kjærgaard

2017

Physics

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High partial-wave (l ≥ 2) Feshbach resonance (FR) in an ultracold mixture of 85 Rb- 87Rb atoms is investigated experimentally aided by a partial-wave insensitive analytic multichannel quantum-defect theory. Two "broad" resonances from coupling between d waves in both the open and closed channels are observed and characterized. One of them shows a fully resolved triplet structure with a splitting ratio well explained by the perturbation to the closed channel due to interatomic spin-spin interaction. These tunable "broad" d-wave resonances, especially the one in the lowest-energy open channel, could find important applications in simulating d-wave coupling dominated many-body systems. In addition, we find that there is generally a time and temperature requirement, associated with tunneling through the angular momentum barrier, to establish and observe resonant coupling in nonzero partial waves. DOI: 10.1103/PhysRevLett.119.203402 Ultracold atoms with controllable interaction via Feshbach resonance (FR) have provided an ideal platform to study novel phenomena in few-and many-body physics [1]. While quantum gases often display smooth crossover behavior when crossing an s-wave FR [2-6], they are predicted to exhibit complex order parameters and quantum phase transitions when driven across FRs of higher partial waves [7][8][9][10][11]. High partial-wave FRs can enhance the nominally suppressed nonzero partial-wave interactions at low temperatures to the unitarity limit [1]. They give access to high partial-wave pairing, which plays an important role in p-wave superfluidity in liquid 3 He [12] or the proposed d-wave high-T c superconductors [13], and can significantly expand the platforms for cold atom based quantum simulations.To coherently control high partial-wave interactions, it is crucial to find suitable high partial-wave FRs with small atom losses. Nearly lossless FRs have only been found in "broad" [1,14] s-wave resonances of fermionic alkali mixtures. All p-wave FRs observed to date are accompanied by strong losses due to either two-body dipolar spin flip or three-body recombination, even for fermionic atomic species [15][16][17][18]. The prevailing wisdom has been to search for high partial-wave FRs in the lowest energy open channels to avoid exothermic dipolar loss, and to search for "broad" high partial-wave FRs dominated by open channels to minimize the influence of the bound states. Unfortunately, the only alkali fermionic atoms, either [29,30]. Both cases described above exhibit one resonance peak.This Letter reports the first observation of two "broad" d-wave FRs, arising from the direct coupling between an open channel d wave and a closed channel d wave. We find a triplet structure with a peak-separation ratio in good agreement with interatomic spin-spin interaction [31] induced level splitting. One of the resonances is in the lowest-energy open channel and is thus free from two-body dipolar spin flip. This work is stimulated and guided by a partial-wave insensitive multichannel quantum-defect...

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Observation of broad p -wave Feshbach resonances in ultracold Rb85−Rb87 mixtures

Cited by 28 publications

References 63 publications

Observation of Broad d -Wave Feshbach Resonances with a Triplet Structure

Observation of Broad d -Wave Feshbach Resonances with a Triplet Structure

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

Scattering Atoms Catch the d Wave

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