High phase-space density gas of NaCs Feshbach molecules

Lam, Aden Z.; Bigagli, Niccolò; Warner, Claire; Yuan, Weijun; Zhang, Siwei; Tiemann, E.; Stevenson, Ian; Will, Sebastian

doi:10.1103/physrevresearch.4.l022019

Cited by 18 publications

(9 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dipole-dipole interaction could be strengthened using Feshbach molecules made from two magnetic atoms [81] or with polar molecules which interact using electric dipole moments. For polar molecules, dipole-dipole interactions > h×1 kHz are achievable for lattice spacings of 532 nm, meaning V = 4k B T corresponds to temperatures below 10 nK, while temperatures of below 60 nK have been recorded in bulk gases of polar molecules [82,83]. A further consideration for polar molecules, however, is that the filling fraction of boson per two lattice sites investigated here is greater than recent experiments where 30% of sites were occupied [12].…”

Section: B Physical Implementationmentioning

confidence: 52%

Dipolar Bose-Hubbard model in finite-size real-space cylindrical lattices

Hughes

Jaksch

2022

Phys. Rev. A

View full text Add to dashboard Cite

Recent experimental progress in magnetic atoms and polar molecules has created the prospect of simulating dipolar Hubbard models with off-site interactions. When applied to real-space cylindrical optical lattices, these anisotropic dipole-dipole interactions acquire a tunable spatially dependent component while they remain translationally invariant in the axial direction, creating a sublattice structure in the azimuthal direction. We numerically study how the coexistence of these classes of interactions affects the ground state of hard-core dipolar bosons at half filling in a finite-size cylindrical optical lattice with octagonal rings. When these two interaction classes cooperate, we find a solid state where the density order is determined by the azimuthal sublattice structure and builds smoothly as the interaction strength increases. For dipole polarizations where the axial interactions are sufficiently repulsive, the repulsion competes with the sublattice structure, significantly increasing entanglement and creating two distinct ordered density patterns. The spatially varying interactions cause the emergence of these ordered states in small lattices as a function of interaction strength to be staggered according to the azimuthal sublattices.

show abstract

Section: B Physical Implementationmentioning

confidence: 52%

Dipolar Bose-Hubbard model in finite-size real-space cylindrical lattices

Hughes

Jaksch

2022

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…The study of the Molecular Superfluid (MSF) phase of weakly interacting ultracold Bose atoms, first analyzed theoretically some two decades ago [1,2], has recently heated up again [3][4][5] due to groundbreaking experimental progress [6] in coherently trapping ultracold cesium atoms and controlling their Feshbach resonances to produce cesium molecules (Cs 2 ) [7][8][9][10][11]. The refinement of these trapping techniques enables a new generation of experiments probing both equilibrium and dynamical properties of both the MSF and proximate Atomic Superfluid (ASF) phase.…”

Section: Introductionmentioning

confidence: 99%

Lifetime of Excitations in Atomic and Molecular Bose-Einstein Condensates

Bellitti¹,

Goldstein²,

Laumann³

2022

Preprint

View full text Add to dashboard Cite

Recent experimental progress has produced Molecular Superfluids (MSF) in thermal equilibrium; this opens the door to a new class of experiments investigating the associated thermodynamic and dynamical responses. We review the theoretical picture of the phase diagram and quasiparticle spectrum in the Atomic Superfluid (ASF) and MSF phases. We further compute the parametric dependence of the quasiparticle lifetimes at one-loop order. In the MSF phase, the U (1) particle number symmetry breaks to Z2 and the spectrum exhibits a gapless Goldstone mode in addition to a gapped Z2-protected atom-like mode. In the ASF phase, the U (1) symmetry breaks completely, leaving behind a Goldstone mode and an unprotected gapped mode. In both phases, the Goldstone mode decays with a rate given by the celebrated Belyaev result, as in a single component condensate. In the MSF phase, the gapped mode is sharp up to a critical Cherenkov momentum beyond which it emits phonons. In the ASF phase, the gapped mode decays with a constant rate even at small momenta. These decay rates govern the spectral response in microtrap tunneling experiments and lead to sharp features in the transmission spectrum of atoms fired through molecular clouds.

show abstract

“…The experiment starts with an ultracold gas of 4 × 10 4 NaCs Feshbach molecules. The molecules are associated from ultracold gases of Na and Cs via a magnetic field ramp across the Feshbach resonance at 864.12(5) G [48,49]. Na and Cs are in their lowest hyperfine state f , m f = |1, 1 and |3, 3 , respectively.…”

mentioning

confidence: 99%

“…For detection, the molecules are dissociated into free atoms via a reverse magnetic field ramp and imaged at low field using the procedure described in Ref. [49].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Ultracold Gas of Dipolar NaCs Ground State Molecules

Stevenson¹,

Lam²,

Bigagli³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

We report on the creation of bosonic NaCs molecules in their absolute rovibrational ground state via stimulated Raman adiabatic passage. We create ultracold gases with up to 22,000 dipolar NaCs molecules at a temperature of 300(50) nK and a peak density of 1.0(4) × 10 12 cm −3 . We demonstrate comprehensive quantum state control by preparing the molecules in a specific electronic, vibrational, rotational, and hyperfine state. Employing the tunability and strength of the permanent electric dipole moment of NaCs, we induce dipole moments of up to 2.6 D. Dipolar systems of NaCs molecules are uniquely suited to explore strongly interacting phases in dipolar quantum matter.techniques to be highly effective as they generally scale proportional to higher powers of d [41][42][43]. For resonant collisional shielding in NaCs, a superb ratio of elastic to inelastic collisions of 10 6 has been predicted [37,42]; for microwave shielding, the large dipole moment will facilitate the required strong microwave coupling between the ground and first ex-

show abstract

High phase-space density gas of NaCs Feshbach molecules

Cited by 18 publications

References 57 publications

Dipolar Bose-Hubbard model in finite-size real-space cylindrical lattices

Dipolar Bose-Hubbard model in finite-size real-space cylindrical lattices

Lifetime of Excitations in Atomic and Molecular Bose-Einstein Condensates

Ultracold Gas of Dipolar NaCs Ground State Molecules

Contact Info

Product

Resources

About