A5066004117- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Strong Light-Matter Interactions
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
- Advanced Thermodynamics and Statistical Mechanics
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Quantum Electrodynamics and Casimir Effect
- Nonlinear Dynamics and Pattern Formation
- Quantum Mechanics and Applications
- Elasticity and Wave Propagation
- Quantum optics and atomic interactions
- Advanced Mathematical Modeling in Engineering
- Heat Transfer and Mathematical Modeling
- Gas Dynamics and Kinetic Theory
- Minerals Flotation and Separation Techniques
- Organic and Molecular Conductors Research
Centre National de la Recherche Scientifique
2022-2024
Institute of Photonic Sciences
2023-2024
Laboratoire de Physique Théorique et Modèles Statistiques
2019-2024
Université Paris-Saclay
2022-2024
Université Paris-Sud
2023
University of Padua
2018-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2022
National Interuniversity Consortium for the Physical Sciences of Matter
2018-2019
Motivated by the recent achievement of space-based Bose-Einstein condensates (BEC) with ultracold alkali-metal atoms under microgravity and proposal bubble traps which confine on a thin shell, we investigate BEC thermodynamics surface sphere. We determine analytically critical temperature condensate fraction noninteracting Bose gas. Then consider inclusion zero-range interatomic potential, extending results at zero finite temperature. Both in interacting cases crucial role radius sphere is...
Abstract Progress in understanding quantum systems has been driven by the exploration of geometry, topology, and dimensionality ultracold atomic systems. The NASA Cold Atom Laboratory (CAL) aboard International Space Station enabled study bubbles, a terrestrially-inaccessible topology. Proof-of-principle bubble experiments have performed on CAL with an radiofrequency-dressing technique; alternate technique (dual-species interaction-driven bubbles) also proposed. Both techniques can drive...
The recent developments of microgravity experiments with ultracold atoms have produced a relevant boost in the study shell-shaped ellipsoidal Bose-Einstein condensates. For realistic bubble-trap parameters, here we calculate critical temperature condensation, which, if compared to one bare harmonic trap same frequencies, shows strong reduction. We simulate zero-temperature density distribution Gross-Pitaevskii equation, and free expansion hollow condensate. While part expands outward...
Ultracold quantum gases are highly controllable and thus capable of simulating difficult many-body problems ranging from condensed matter physics to astrophysics. Although experimental realizations have so far been restricted flat geometries, recently also curved systems, with the prospect exploring tunable produced in microgravity facilities as ground-based experiments technically limited. Here, we analyze bubble-trapped condensates, which atoms confined on surface a thin spherically...
We investigate the ground-state properties of N bosons with attractive zero-range interactions characterized by scattering length a > 0 and confined to surface sphere radius R. present analytic solution problem for = 2, mean-field analysis N→∞, exact diffusion Monte Carlo results intermediate N. For finite N, we observe smooth crossover from uniform state in limit a/R≫1 (weak attraction) localized at small a/R (strong attraction). With increasing this narrows down discontinuous...
We solve the problem of a dimer moving on spherical surface and find that its binding energy wave function are sensitive to total angular momentum. The gets squeezed in direction orthogonal center-of-mass motion can qualitatively change geometry from two-dimensional one-dimensional.
Recent experimental and theoretical results show that weakly interacting atomic Bose-Bose mixtures with attractive interspecies interaction are stabilized by beyond-mean-field effects. Here we consider the peculiar properties of these systems in a strictly one-dimensional configuration, taking also into account nontrivial role spin-orbit Rabi couplings. We when value inter- intraspecies strengths such mean-field contributions to energy cancel, self-bound bright soliton fully governed quantum...
We consider the problem of $N$ identical fermions interacting via a zero-range attractive potential with lighter atom in one dimension. Using few-body approach based on Skorniakov and Ter-Martirosian equation, we determine energies critical mass ratios for emergence tetramer, pentamer, hexamer. For large $N$, solve analytically by using mean-field theory Thomas-Fermi approximation. The system becomes bound when heavy-to-light ratio exceeds value, which grows as ${N}^{3}$ at $N$. also employ...
The control over the geometry and topology of quantum systems is crucial for advancing novel technologies. This work provides a synthesis recent insights into behavior vortices within atomic Bose–Einstein condensates (BECs) subject to curved geometric constraints. We highlight significant impact curvature on condensate density phase distribution, particularly in quasi-one-dimensional waveguides different angular momentum states. An engineered periodic transport quantized vorticity between...
We investigate an ultracold and dilute Bose gas by taking into account a finite-range two-body interaction. The coupling constants of the resulting Lagrangian density are related to measurable scattering parameters following effective-field-theory approach. A perturbative scheme is then developed up Gaussian level, where both quantum thermal fluctuations crucially affected corrections. In particular, relation between spontaneous symmetry breaking onset superfluidity emphasized recovering...
We analyze the scattering problem of identical bosonic particles confined on a spherical surface. At low energies and for radius much larger than healing length, we express contact interaction strength in terms $s$-wave length. Adopting this relation, are then able to regularize zero-point energy Bose gas obtain its equation state, which includes corrections due finite sphere coincides with flat-case result infinite-radius limit. also provide microscopic derivation superfluid density system,...
We study binding of N <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math> identical heavy fermions by a light atom in two dimensions assuming zero-range attractive heavy-light interactions. By using the mean-field theory valid for large we show that N+1 display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> cluster is bound when mass ratio exceeds 1.074N^2...
Sound propagation is a macroscopic manifestation of the interplay between equilibrium thermodynamics and dynamical transport properties fluids. Here, for two-dimensional system ultracold fermions, we calculate first second sound velocities across whole BCS-BEC crossover, analyze response to an external perturbation. In low-temperature regime reproduce recent measurements [Phys. Rev. Lett. 124, 240403 (2020)] velocity, which, due decoupling density entropy fluctuations, sole mode excited by...
We derive the two-dimensional equation of state for a bosonic system ultracold atoms interacting with finite-range effective interaction. Within functional integration approach, we employ an hydrodynamic parametrization field to calculate superfluid equations motion and zero-temperature pressure. The ultraviolet divergences, naturally arising from interaction, are regularized improved dimensional regularization technique.
For sufficiently large mass ratios the attractive exchange force caused by a single light atom interacting with few heavy identical fermions can overcome their Fermi degeneracy pressure and bind them into an N+1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> cluster. Here, using mean-field approach valid for N display="inline"><mml:mi>N</mml:mi></mml:math> , we find that clusters...
We study the quantum tunneling of two one-dimensional quasi-condensates made alkali-metal atoms, considering different configurations: side-by-side and head-to-tail. After deriving quasiparticle excitation spectrum, we discuss dynamics relative phase following a sudden coupling independent subsystems. In particular, calculate coherence factor system, which, due to nonzero amplitude, it exhibits dephasing-rephasing oscillations instead pure dephasing. These are enhanced by higher energy,...
Abstract We theoretically investigate sound modes in a weakly-interacting collisional Bose gas D dimensions. Using the Landau’s two-fluid hydrodynamics and working within Bogoliubov theory, we observe hybridization of first second for ⩾ 2. To model recent measurements velocities 2D, obtained regime around Berezinskii–Kosterlitz–Thouless transition temperature, derive refined calculation superfluid density, finding fair agreement with experiment. In 1D case, which experimental results are...
We study binding of $N$ identical heavy fermions by a light atom in two dimensions assuming zero-range attractive heavy-light interactions. By using the mean-field theory valid for large we show that $N+1$ cluster is bound when mass ratio exceeds $1.074N^2$. The theory, being scale invariant dimensions, predicts only shapes clusters leaving their sizes and energies undefined. taking into account beyond-mean-field effects find closed-form expressions these quantities. also discuss differences...
We review our theoretical results about the sound propagation in two-dimensional (2D) systems of ultracold fermionic and bosonic atoms. In superfluid phase, characterized by spontaneous symmetry breaking $U(1)$ symmetry, there is coexistence first second sound. case weakly-interacting repulsive bosons, we model recent measurements velocities 39K atoms 2D obtained regime around Berezinskii-Kosterlitz-Thouless (BKT) superfluid-to-normal transition temperature. particular, perform a quite...