Observation of quantum droplets in a heteronuclear bosonic mixture

D’Errico, Chiara; Burchianti, Alessia; Prevedelli, M.; Salasnich, Luca; Ancilotto, Francesco; Modugno, Michèle; Minardi, F.; Fort, C.

doi:10.1103/physrevresearch.1.033155

Cited by 264 publications

(231 citation statements)

References 47 publications

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“…Further, its center-of-mass follows a trajectory in between the ones of the unbound single-species components, and can be easily distinguished from those for sufficiently long evolution times. From the center-of-mass motions of the bound and the unbound components we have extracted the ratio N 1 /N 2 in the bound state, confirming the result predicted by the theory [34]. Taking into account our experimental atom number, stable droplets form for a 12 < −82a 0 .…”

Section: Observation Of 41 K-87 Rb Droplets In a Waveguidesupporting

confidence: 83%

“…Indeed, as pointed out by D. Petrov [24], the interplay between attractive inter-and repulsive intra-species couplings can give rise to the formation of liquid-like "quantum droplets". These were first observed in single-species dipolar gases [25][26][27][28][29][30], wherein the attractive dipole-dipole interaction plays the role of the interspecies interaction, and then in homonuclear mixtures of 39 K [31][32][33] and heteronuclear mixtures of 41 K-87 Rb [34]. In the latter cases, as originally proposed [24,35], the system is characterized only by isotropic contact interactions, allowing for a simple theoretical description of the droplet state.…”

Section: Introductionmentioning

confidence: 85%

“…This difference is caused by the fact that the 41 K-87 Rb droplets are more dilute than the 39 K ones. Close to the MF threshold for collapse, we have measured a three-body loss coefficient K 3 of the order of 10 −40 m 6 /s [34], whose value is mainly determined by K-Rb-Rb collisions [57]. This yields, for small values of δa, an expected droplet lifetime τ life = K −1 3 n −2 of the order of 1 s.…”

Section: B Observation Of 41 K-87 Rb Droplets In Free Spacementioning

confidence: 93%

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A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions

et al. 2020

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We report on the production of a 41 K-87 Rb dual-species Bose-Einstein condensate with tunable interspecies interaction and we study the mixture in the attractive regime, i.e. for negative values of the interspecies scattering length a12. The binary condensate is prepared in the ground state and confined in a pure optical trap. We exploit Feshbach resonances for tuning the value of a12. After compensating the gravitational sag between the two species with a magnetic field gradient, we drive the mixture into the attractive regime. We let the system to evolve both in free space and in an optical waveguide. In both geometries, for strong attractive interactions, we observe the formation of self-bound states, recognizable as quantum droplets. Our findings prove that robust, long-lived droplet states can be realized in attractive two-species mixtures, despite the two atomic components possibly experiencing different potentials. * burchianti@lens.unifi.it † Present address: Istituto per la Protezione Sostenibile delle Piante, CNR-IPSP, 10135 Torino, Italy arXiv:2003.13362v1 [cond-mat.quant-gas]

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Section: Observation Of 41 K-87 Rb Droplets In a Waveguidesupporting

confidence: 83%

Section: Introductionmentioning

confidence: 85%

Section: B Observation Of 41 K-87 Rb Droplets In Free Spacementioning

confidence: 93%

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A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions

et al. 2020

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“…The crucial difference is that the ultracold atoms provide an unprecedented control over the tunability of interactions and geometry of the system. The droplets were first produced in Bose gases with dipolar interactions [11][12][13]19] and afterwards in binary bosonic mixtures with contact-like interactions [14][15][16][17]. The observed equilibrium density can be eight orders of magnitude smaller than in liquid helium, due to an almost exact compensation between mean-field repulsion and attraction.…”

mentioning

confidence: 99%

“…Notes on a possible experimental implementation. One of the main complications of the experimental observation of quantum droplets is their very short life-times due to three-body losses [16,17]. This effect can be suppressed by reducing the density of the quantum droplet [17].…”

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confidence: 99%

Quantum droplets of bosonic mixtures in a one-dimensional optical lattice

Morera

Astrakharchik

Polls

et al. 2020

Phys. Rev. Research

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We demonstrate the existence of quantum droplets in two-component one-dimensional Bose-Hubbard chains. The droplets exist for any strength of repulsive intra-species interactions provided they are balanced by comparable attractive inter-species interactions. The ground-state phase diagram is presented and the different phases are characterized by examining the density profile and off-diagonal one-and two-body correlation functions. A rich variety of phases is found, including atomic superfluid gases, atomic superfluid droplets, pair superfluid droplets, pair superfluid gases and a Mott-insulator phase. A parameter region prone to be experimentally explored is identified, where the average population per site is lower than three atoms, thus avoiding three-body losses. Finally, the bipartite entanglement of the droplets is found to have a non-trivial dependence on the number of particles.

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Semidiscrete Vortex Solitons

Chen

et al. 2021

Advanced Photonics Research

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A possibility of creation of stable optical solitons combining one continuous and one discrete coordinates, with embedded vorticity, in an array of planar waveguides with intrinsic cubic–quintic (CQ) nonlinearity is demonstrated. The same system may be realized in terms of the spatiotemporal light propagation in an array of tunnel‐coupled optical fibers with the CQ nonlinearity. In contrast with zero‐vorticity states, semidiscrete vortex solitons do not exist without the quintic term in the nonlinearity. Two types of the solitons, viz., intersite‐centered (IC) and onsite‐centered (OC) ones, with even and odd numbers N of actually excited sites in the discrete direction, are identified. The modes carrying the embedded vorticity S=1 and 2 are considered. In accordance with their symmetry, the vortex solitons of the OC type exhibit an intrinsic core, whereas the IC solitons with small N may have a coreless structure. Facilitating their creation in the experiment, the modes reported in the present work may be much more compact states than their counterparts considered in other systems, and they feature strong anisotropy. They can be set in motion in the discrete direction, provided that the coupling constant exceeds a certain minimum value. Collisions between moving vortex solitons are also considered.

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Observation of quantum droplets in a heteronuclear bosonic mixture

Cited by 264 publications

References 47 publications

A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions

A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions

Quantum droplets of bosonic mixtures in a one-dimensional optical lattice

Semidiscrete Vortex Solitons

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