Publications (114)
Dynamic structure factor of a Bose Einstein condensate in a 1D optical lattice
C. Menotti, M. Kraemer, L. Pitaevskii +1
We study the effect of a one dimensional periodic potential on the dynamic structure factor of an interacting Bose Einstein condensate at zero temperature. We show that, due to pho…
Kelvin Modes of a fast rotating Bose-Einstein Condensate
F. Chevy, S. Stringari
Using the concept of diffused vorticity and the formalism of rotational hydrodynamics we calculate the eigenmodes of a harmonically trapped Bose-Einstein condensate containing an a…
Destroying superfluidity by rotating a Fermi gas at unitarity
I. Bausmerth, A. Recati, S. Stringari
We study the effect of the rotation on a harmonically trapped Fermi gas at zero temperature under the assumption that vortices are not formed. We show that at unitarity the rotatio…
Observation of Spin Superfluidity in a Bose Gas Mixture
E. Fava, T. Bienaimé, C. Mordini +5
The spin dynamics of a harmonically trapped Bose-Einstein condensed binary mixture of sodium atoms is experimentally investigated at finite temperature. In the collisional regime t…
Kinetic energy of a trapped Fermi gas interacting with a Bose-Einstein condensate
L. Vichi, M. Amoruso, A. Minguzzi +2
We study a confined mixture of bosons and fermions in the regime of quantal degeneracy, with particular attention to the effects of the interactions on the kinetic energy of the fe…
Interference of Bose-Einstein condensates in momentum space
L. Pitaevskii, S. Stringari
We suggest an experiment to investigate the linear superposition of two spatially separated Bose-Einstein condensates. Due to the coherent combination of the two wave functions, th…
Measurement of the Temperature Dependence of the Casimir-Polder Force
J. M. Obrecht, R. J. Wild, M. Antezza +3
We report on the first measurement of a temperature dependence of the Casimir-Polder force. This measurement was obtained by positioning a nearly pure 87-Rb Bose-Einstein condensat…
Dynamic structure factor and momentum distribution of a trapped Bose gas
F. Zambelli, L. P. Pitaevskii, D. M. Stamper-Kurn +1
The dynamic structure factor of a trapped Bose-Einstein condensed gas is investigated at zero temperature in the framework of Bogoliubov theory. Different values of momentum transf…
Structural and dynamical properties of superfluid helium: a density functional approach
F. Dalfovo, A. Lastri, L. Pricaupenko +2
We present a novel density functional for liquid 4He, properly accounting for the static response function and the phonon-roton dispersion in the uniform liquid. The functional is…
Oscillations of a Bose-Einstein condensate rotating in a harmonic plus quartic trap
M. Cozzini, A. L. Fetter, B. Jackson +1
We study the normal modes of a two-dimensional rotating Bose-Einstein condensate confined in a quadratic plus quartic trap. Hydrodynamic theory and sum rules are used to derive ana…
Quantum Evaporation from the Free Surface of Superfluid 4He
F. Dalfovo, A. Fracchetti, A. Lastri +2
The scattering of atoms and rotons at the free surface of superfluid 4He is studied in the framework of linearised time dependent mean field theory. The phenomenological Orsay-Tren…
Collective mode of homogeneous superfluid Fermi gases in the BEC-BCS crossover
R. Combescot, M. Yu. Kagan, S. Stringari
We perform a detailed study of the collective mode across the whole BEC-BCS crossover in fermionic gases at zero temperature, covering the whole range of energy beyond the linear r…
Magnetic defects in an unbalanced mixture of two Bose-Einstein condensates
A. GallemÃ, L. P. Pitaevskii, S. Stringari +1
When the spectrum of magnetic excitations of a quantum mixture is much softer than the density spectrum, the system becomes effectively incompressible and can host magnetic defects…
Collective oscillations of an interacting trapped Fermi gas
L. Vichi, S. Stringari
We calculate the effects of two-body interactions on the low frequency oscillations of a normal Fermi gas confined in a harmonic trap. The mean field contribution to the collective…
Quantum Evaporation from Superfluid Helium at Normal Incidence
F. Dalfovo, M. Guilleumas, A. Lastri +2
We study the scattering of atoms, rotons and phonons at the free surface of He at normal incidence and calculate the evaporation, condensation and reflection probabilities. Ass…
The cross-over from Townes solitons to droplets in a 2D Bose mixture
B. Bakkali-Hassani, C. Maury, S. Stringari +3
When two Bose-Einstein condensates -- labelled 1 and 2 -- overlap spatially, the equilibrium state of the system depends on the miscibility criterion for the two fluids. Here, we t…
Spin polarizability of a trapped superfluid Fermi gas
A. Recati, I. Carusotto, C. Lobo +1
The polarization produced by the relative displacement of the potentials trapping two spin species of a dilute Fermi gas with $N_\ua=N_\da$ is calculated at unitarity by assuming p…
Dispersion Law of Edge Waves in the Quantum Hall Effect
S. Giovanazzi, L. Pitaevskii, S. Stringari
We present a microscopic description of edge excitations in the quantum Hall effect which is analogous to Feynman's theory of superfluids. Analytic expressions for the excitation e…
Second sound and the density response function in uniform superfluid atomic gases
H. Hu, E. Taylor, X. -J. Liu +2
Recently there has been renewed interest in second sound in superfluid Bose and Fermi gases. By using two-fluid hydrodynamic theory, we review the density response $Ï_{nn}(\bq,Ï)…
Critical velocity of superfluid flow through single barrier and periodic potentials
Gentaro Watanabe, F. Dalfovo, F. Piazza +2
We investigate the problem of an ultracold atomic gas in the superfluid phase flowing in the presence of a potential barrier or a periodic potential. We use a hydrodynamic scheme i…
Overcritical Rotation of a Trapped Bose-Einstein Condensate
A. Recati, F. Zambelli, S. Stringari
The rotational motion of an interacting Bose-Einstein condensate confined by a harmonic trap is investigated by solving the hydrodynamic equations of superfluids, with the irrotati…
Scaling and thermodynamics of a trapped Bose-condensed gas
S. Giorgini, L. Pitaevskii, S. Stringari
We investigate the thermodynamics of a Bose gas interacting with repulsive forces and confined in a harmonic trap. We show that the relevant parameters of the system (temperature,…
Spin Excitations and Sum Rules in the Heisenberg Antiferromagnet
S. Stringari
Various bounds for the energy of collective excitations in the Heisenberg antiferromagnet are presented and discussed using the formalism of sum rules. We show that the Feynman app…
Measurement of the Canonical Equation of State of a Weakly Interacting 3D Bose Gas
C. Mordini, D. Trypogeorgos, A. Farolfi +4
Using a multiple-image reconstruction method applied to a harmonically trapped Bose gas, we determine the equation of state of uniform matter across the critical transition point,…
Equation of state and collective frequencies of a trapped Fermi gas along the BEC-unitarity crossover
G. E. Astrakharchik, R. Combescot, X. Leyronas +1
We show that the study of the collective oscillations in a harmonic trap provides a very sensitive test of the equation of state of a Fermi gas near a Feshbach resonance. Using a s…
The role of interactions in spin-polarised atomic Fermi gases at unitarity
A. Recati, C. Lobo, S. Stringari
We study the zero temperature properties of a trapped polarized Fermi gas at unitarity by assuming phase separation between an unpolarized superfluid and a polarized normal phase.…
Chandrasekhar-Clogston limit and phase separation in Fermi mixtures at Unitarity
I. Bausmerth, A. Recati, S. Stringari
Using many-body results available from diagrammatic and {\it ab initio} Monte Carlo calculations we analyze the phase diagram versus $h=(μ_{…
Rapid ramps across the BEC-BCS crossover: a novel route to measuring the superfluid gap
R. G. Scott, F. Dalfovo, L. P. Pitaevskii +1
We investigate the response of superfluid Fermi gases to rapid changes of the three-dimensional s-wave scattering length a by solving the time-dependent Bogoliubov-de Gennes equati…
One-dimensional description of a Bose-Einstein condensate in a rotating closed-loop waveguide
S. Schwartz, M. Cozzini, C. Menotti +3
We propose a general procedure for reducing the three-dimensional Schrodinger equation for atoms moving along a strongly confining atomic waveguide to an effective one-dimensional…
Bosons in anisotropic traps: ground state and vortices
F. Dalfovo, S. Stringari
We solve the Gross-Pitaevskii equations for a dilute atomic gas in a magnetic trap, modeled by an anisotropic harmonic potential. We evaluate the wave function and the energy of th…
Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate
G. Chauveau, C. Maury, F. Rabec +7
At zero temperature, a Galilean-invariant Bose fluid is expected to be fully superfluid. Here we investigate theoretically and experimentally the quenching of the superfluid densit…
Quantum degeneracy and interaction effects in spin-polarized Fermi-Bose mixtures
L. Vichi, M. Inguscio, S. Stringari +1
Various features of spin-polarized Fermi gases confined in harmonic traps are discussed, taking into account possible perspectives of experimental measurements. The mechanism of th…
Collective and single particle excitations of a trapped Bose gas
F. Dalfovo, S. Giorgini, M. Guilleumas +2
The density of states of a Bose-condensed gas confined in a harmonic trap is investigated. The predictions of Bogoliubov theory are compared with the ones of Hartree-Fock theory an…
Equilibrium and dynamics of a trapped superfluid Fermi gas with unequal masses
G. Orso, L. P. Pitaevskii, S. Stringari
Interacting Fermi gases with equal populations but unequal masses are investigated at zero temperature using local density approximation and the hydrodynamic theory of superfluids…
Uncertainty Principle and Off-Diagonal Long Range Order in the Fractional Quantum Hall Effect
L. Pitaevskii, S. Stringari
A natural generalization of the Heisenberg uncertainty principle inequality holding for non hermitian operators is presented and applied to the fractional quantum Hall effect (FQHE…
Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas
L. Tanzi, S. M. Roccuzzo, E. Lucioni +6
The existence of a paradoxical supersolid phase of matter, possessing the apparently incompatible properties of crystalline order and superfluidity, was predicted 50 years ago. Sol…
Static-response theory and the roton-maxon spectrum of a flattened dipolar Bose-Einstein condensate
R. N. Bisset, P. B. Blakie, S. Stringari
Important information for the roton-maxon spectrum of a flattened dipolar Bose-Einstein condensate is extracted by applying a static perturbation exhibiting a periodic in-plane mod…
The decay and collisions of dark solitons in superfluid Fermi gases
R. G. Scott, F. Dalfovo, L. P. Pitaevskii +4
We study soliton collisions and the decay of solitons into sound in superfluid Fermi gases across the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover by p…
Shape deformations and angular momentum transfer in trapped Bose-Einstein condensates
F. Dalfovo, S. Stringari
Angular momentum can be transferred to a trapped Bose-Einstein condensate by distorting its shape with an external rotating field, provided the rotational frequency is larger than…
Nonlinear Dynamics of a Bose Condensed Gas
F. Dalfovo, C. Minniti, S. Stringari +1
We investigate the dynamic behavior of a Bose-condensed gas of alkali atoms interacting with repulsive forces and confined in a magnetic trap at zero temperature. Using the Thomas-…
Moment of Inertia and Superfluidity of a Trapped Bose Gas
S. Stringari
The temperature dependence of the moment of inertia of a dilute Bose gas confined in a harmonic trap is determined. Deviations from the rigid value, due to the occurrence of Bose-E…
Entropy exchange in a mixture of ultracold atoms
J. Catani, G. Barontini, G. Lamporesi +5
We investigate experimentally the entropy transfer between two distinguishable atomic quantum gases at ultralow temperatures. Exploiting a species-selective trapping potential, we…
Momentum distribution of a trapped Fermi gas with large scattering length
L. Viverit, S. Giorgini, L. P. Pitaevskii +1
Using a scattering length parametrization of the BCS-BEC crossover as well as the local density approximation for the density profile, we calculate the momentum distribution of a h…
Minimally destructive, Doppler measurement of a quantized, superfluid flow
A. Kumar, N. Anderson, W. D. Phillips +3
The Doppler effect, the shift in the frequency of sound due to motion, is present in both classical gases and quantum superfluids. Here, we perform an in-situ, minimally destructiv…
Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
G. M. Bruun, A. Recati, C. J. Pethick +2
Highly polarized mixtures of atomic Fermi gases constitute a novel Fermi liquid. We demonstrate how information on thermodynamic properties may be used to calculate quasiparticle s…
Order Parameter at the Boundary of a Trapped Bose Gas
F. Dalfovo, L. Pitaevskii, S. Stringari
Through a suitable expansion of the Gross-Pitaevskii equation near the classical turning point, we obtain an explicit solution for the order parameter at the boundary of a trapped…
Umklapp collisions and center of mass oscillation of a trapped Fermi gas
G. Orso, L. P. Pitaevskii, S. Stringari
Starting from the the Boltzmann equation, we study the center of mass oscillation of a harmonically trapped normal Fermi gas in the presence of a one-dimensional periodic potential…
Supersolid edge and bulk phases of a dipolar quantum gas in a box
S. M. Roccuzzo, S. Stringari, Alessio Recati
We investigate the novel density distributions acquired by a dipolar Bose-Einstein condensed gas confined in a box potential, with special focus on the effects of supersolidity. Di…
Rotating a supersolid dipolar gas
S. M. Roccuzzo, A. GallemÃ, A. Recati +1
Distintictive features of supersolids show up in their rotational properties. We calculate the moment of inertia of a harmonically trapped dipolar Bose-Einstein condensed gas as a…
Density and spin response function of a normal Fermi gas at unitarity
S. Stringari
Using Landau theory of Fermi liquids we calculate the dynamic response of both a polarized and unpolarized normal Fermi gas at zero temperature in the strongly interacting regime o…
Dipolar Drag in Bilayer Harmonically Trapped Gases
N. Matveeva, A. Recati, S. Stringari
We consider two separated pancake-shaped trapped gases interacting with a dipolar (either magnetic or electric) force. We study how the center of mass motion propagates from one cl…
Consequence of superfluidity on the expansion of a rotating Bose-Einstein condensate
Mark Edwards, Charles W. Clark, P. Pedri +2
We study the time evolution of a rotating condensate, that expands after being suddenly released from the confining trap, by solving the hydrodynamic equations of irrotational supe…
Bounds for the phonon-roton dispersion in superfluid 4He
J. Boronat, J. Casulleras, F. Dalfovo +2
The sum rule approach is used to derive upper bounds for the dispersion law of the elementary excitations of a Bose superfluid. Bounds are explicitly calculated for the p…
Static Response Function for Longitudinal and Transverse Excitations in Superfluid Helium
F. Dalfovo, S. Stringari
The sum rule formalism is used to evaluate rigorous bounds for the density and current static response functions in superfluid helium at zero temperature. Both lower and upper boun…
Expansion of a coherent array of Bose-Einstein condensates
P. Pedri, L. Pitaevskii, S. Stringari +6
We investigate the properties of a coherent array containing about 200 Bose-Einstein condensates produced in a far detuned 1D optical lattice. The density profile of the gas, image…
Quantum fluctuations and collective oscillations of a Bose-Einstein condensate in a 2D optical lattice
G. Orso, C. Menotti, S. Stringari
We use Bogoliubov theory to calculate the beyond mean field correction to the equation of state of a weakly interacting Bose gas in the presence of a tight 2D optical lattice. We s…
Theory of Bose-Einstein condensation in trapped gases
F. Dalfovo, S. Giorgini, L. P. Pitaevskii +1
The phenomenon of Bose-Einstein condensation of dilute gases in traps is reviewed from a theoretical perspective. Mean-field theory provides a framework to understand the main feat…
Dynamics of Bose condensed gases in highly deformed traps
S. Stringari
We provide a unified investigation of normal modes and sound propagation at zero temperature in Bose condensed gases confined in highly asymmetric harmonic traps and interacting wi…
Counter-flow instability of a quantum mixture of two superfluids
M. Abad, A. Recati, S. Stringari +1
We study the instability of a mixture of two interacting counter-flowing superfluids. For a homogeneous system, we show that superfluid hydrodynamics leads to the existence of a dy…
A superfluid gyroscope with cold atomic gases
S. Stringari
A trapped Bose-Einstein condensed atomic gas containing a quantized vortex is predicted to exhibit precession after a sudden rotation of the confining potential. The equations desc…
First and second sound in a strongly interacting Fermi gas
E. Taylor, H. Hu, X. -J. Liu +3
Using a variational approach, we solve the equations of two-fluid hydrodynamics for a uniform and trapped Fermi gas at unitarity. In the uniform case, we find that the first and se…
Sum Rules and Bose-Einstein Condensation
S. Stringari
Various sum rules accounting for the coupling between density and particle excitations and emphasizing in an explicit way the role of the Bose-Einstein condensation are discussed.…
Increasing Quantum Degeneracy by Heating a Superfluid
D. J. Papoular, G. Ferrari, L. P. Pitaevskii +1
We consider a uniform superfluid confined in two compartments connected by a superleak and initially held at equal temperatures. If one of the two compartments is heated, a fractio…
Propagation of sound in a Bose Einstein condensate in an optical lattice
C. Menotti, M. Kramer, A. Smerzi +2
We study the propagation of sound waves in a Bose-Einstein condensate trapped in a one-dimensional optical lattice. We find that the velocity of propagation of sound wavepackets de…
Density functional calculations for 4He droplets
M. Casas, F. Dalfovo, A. Lastri +2
A novel density functional, which accounts correctly for the equation of state, the static response function and the phonon-roton dispersion in bulk liquid helium, is used to predi…
How to measure the Bogoliubov quasiparticle amplitudes in a trapped condensate
A. Brunello, F. Dalfovo, L. Pitaevskii +1
We propose an experiment, based on two consecutive Bragg pulses, to measure the momentum distribution of quasiparticle excitations in a trapped Bose gas at low temperature. With th…
The Surface Region of Superfluid He as a Dilute Bose-Condensed Gas
A. Griffin, S. Stringari
In the low-density surface region of superfluid He, the atoms are far apart and collisions can be ignored. The only effect of the interactions is from the long-range attractive…
Scissors mode and superfluidity of a trapped Bose-Einstein condensed gas
D. Guery-Odelin, S. Stringari
We investigate the oscillation of a dilute atomic gas generated by a sudden rotation of the confining trap (scissors mode). This oscillation reveals the effects of superfluidity ex…
Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice
L. P. Pitaevskii, S. Stringari, G. Orso
We develop the hydrodynamic theory of Fermi superfluids in the presence of a periodic potential. The relevant parameters governing the propagation of sound (compressibility and eff…
Dynamical response of a Bose-Einstein condensate to a discontinuous change in internal state
M. R. Matthews, D. S. Hall, D. S. Jin +6
A two-photon transition is used to convert an arbitrary fraction of the 87Rb atoms in a |F=1,m_f=-1> condensate to the |F=2,m_f=1> state. Transferring the entire population imposes…
Dynamics of a classical gas including dissipative and mean field effects
P. Pedri, D. Guéry-Odelin, S. Stringari
By means of a scaling ansatz, we investigate an approximated solution of the Boltzmann-Vlasov equation for a classical gas. Within this framework, we derive the frequencies and the…
Fast thermalization and Helmholtz oscillations of an ultracold Bose gas
D. J. Papoular, L. P. Pitaevskii, S. Stringari
We analyze theoretically the transport properties of a weakly-interacting ultracold Bose gas enclosed in two reservoirs connected by a constriction. We assume that the transport of…
Quantized conductance through the quantum evaporation of bosonic atoms
D. J. Papoular, L. P. Pitaevskii, S. Stringari
We analyze theoretically the quantization of conductance occurring with cold bosonic atoms trapped in two reservoirs connected by a constriction with an attractive gate potential.…
Moment of Inertia and Dynamical Rotational Response of a Supersolid Dipolar Gas
S. M. Roccuzzo, A. Recati, S. Stringari
We show that the knowledge of the time dependent response of a trapped gas, subject to a sudden rotation of a confining harmonic potential, allows for the determination of the mome…
Violation of self-similarity in the expansion of a 1D Bose gas
P. Pedri, L. Santos, P. Ohberg +1
The expansion of a 1D Bose gas is investigated employing the Lieb-Liniger equation of state within the local density approximation. We show that during the expansion the density pr…
Thermal vs quantum decoherence in double well trapped Bose-Einstein condensates
L. Pitaevskii, S. Stringari
The quantum and thermal fluctuations of the phase are investigated in a cold Bose gas confined by a double well trap. The coherence of the system is discussed in terms of the visib…
Collective excitations of a trapped Bose-condensed gas
S. Stringari
By taking the hydrodynamic limit we derive, at , an explicit solution of the linearized time dependent Gross-Pitaevskii equation for the order parameter of a Bose gas confined…
Unitary polarized Fermi gas under adiabatic rotation
I. Bausmerth, A. Recati, S. Stringari
We discuss the effect of an adiabatic rotation on the phase separation between the superfluid and normal component of a trapped polarized Fermi gas at unitarity and zero temperatur…
Molecular signatures in the structure factor of an interacting Fermi gas
R. Combescot, S. Giorgini, S. Stringari
The static and dynamic structure factors of an interacting Fermi gas along the BCS-BEC crossover are calculated at momentum transfer higher than the Fermi momentum.…
Rotons and Quantum Evaporation from Superfluid 4He
F. Dalfovo, A. Fracchetti, A. Lastri +2
The probability of evaporation induced by and rotons at the surface of superfluid helium is calculated using time dependent density functional theory. We consider excit…
Anomalous fluctuations of the condensate in interacting Bose gases
S. Giorgini, L. P. Pitaevskii, S. Stringari
We find that the fluctuations of the condensate in a weakly interacting Bose gas confined in a box of volume follow the law . This anomalous behaviour ar…
Local atom-number fluctuations in quantum gases at finite temperature
M. Klawunn, A. Recati, L. P. Pitaevskii +1
We investigate the number fluctuations in small cells of quantum gases pointing out important deviations from the thermodynamic limit fixed by the isothermal compressibility. Both…
Vortex lattices in Bose-Einstein condensates: from the Thomas-Fermi to the lowest Landau level regime
M. Cozzini, S. Stringari, C. Tozzo
We consider a periodic vortex lattice in a rotating Bose-Einstein condensed gas, where the centrifugal potential is exactly compensated by the external harmonic trap. By introducin…
Collisions and expansion of an ultracold dilute Fermi gas
B. Jackson, P. Pedri, S. Stringari
We discuss the effects of collisions on the expansion of a degenerate normal Fermi gas, following the sudden removal of the confining trap. Using a Boltzmann equation approach, we…
Vortex nucleation and quadrupole deformation of a rotating Bose-Einstein condensate
M. Kraemer, L. Pitaevskii, S. Stringari +1
Using a semi-analytic model based on the Thomas-Fermi approximation, we investigate the relevance of the quadrupole deformation of a trapped Bose-Einstein condensate for the nuclea…
Hydrodynamic modes in a trapped Bose gas above the Bose-Einstein transition
A. Griffin, Wen-Chin Wu, S. Stringari
We discuss the collective modes of a trapped Bose gas in the hydrodynamic regime where atomic collisions ensure local thermal equilibrium for the distribution function. Starting fr…
Dispersion of Ripplons in Superfluid 4he
A. Lastri, F. Dalfovo, L. Pitaevskii +1
A detailed study of the dispersion law of surface excitations in liquid \hef at zero temperature is presented, with special emphasis to the short wave length region. The hybridizat…
First and second sound in cylindrically trapped gases
G. Bertaina, L. Pitaevskii, S. Stringari
We investigate the propagation of density and temperature waves in a cylindrically trapped gas with radial harmonic confinement. Starting from two-fluid hydrodynamic theory we deri…
Momentum transferred to a trapped Bose-Einstein condensate by stimulated light scattering
A. Brunello, F. Dalfovo, L. Pitaevskii +2
The response of a trapped Bose-Einstein condensed gas to a density perturbation generated by a two-photon Bragg pulse is investigated by solving the time-dependent Gross-Pitaevskii…
Elementary excitations in trapped Bose gases beyond mean field approximation
L. Pitaevskii, S. Stringari
Using hydrodynamic theory of superfluids and the Lee-Huang-Yang equation of state for interacting Bose gases we derive the first correction to the collective frequencies of a trapp…
Variational Calculations for He Impurities on He Droplets
A. BeliÄ, F. Dalfovo, S. Fantoni +1
Variational Monte Carlo method is used to calculate ground state properties of He droplets, containing 70, 112, 168, 240, 330, and 728 particles. The resulting particle and kin…
Insulating Behavior of a Trapped Ideal Fermi Gas
L. Pezze', L. Pitaevskii, A. Smerzi +7
We investigate theoretically and experimentally the center-of-mass motion of an ideal Fermi gas in a combined periodic and harmonic potential. We find a crossover from a conducting…
Helium nanodroplets and trapped Bose-Einstein condensates as prototypes of finite quantum fluids
F. Dalfovo, S. Stringari
Helium nanodroplets and trapped Bose-Einstein condensates in dilute atomic gases offer complementary views of fundamental aspects of quantum many-body systems. We discuss analogies…
Roadmap on Atomtronics: State of the art and perspective
L. Amico, M. Boshier, G. Birkl +56
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types…
Normal state of a polarized Fermi gas at unitarity
C. Lobo, A. Recati, S. Giorgini +1
We study the Fermi gas at unitarity and at T=0 by assuming that, at high polarizations, it is a normal Fermi liquid composed of weakly interacting quasiparticles associated with th…
Landau damping in dilute Bose gases
L. P. Pitaevskii, S. Stringari
Landau damping in weakly interacting Bose gases is investigated by means of perturbation theory. Our approach points out the crucial role played by Bose-Einstein condensation and y…
Expansion of an interacting Fermi gas
C. Menotti, P. Pedri, S. Stringari
We study the expansion of a dilute ultracold sample of fermions initially trapped in a anisotropic harmonic trap. The expansion of the cloud provides valuable information about the…
Macroscopic dynamics of a trapped Bose-Einstein condensate in the presence of 1D and 2D optical lattices
M. Kraemer, L. Pitaevskii, S. Stringari
The hydrodynamic equations of superfluids for a weakly interacting Bose gas are generalized to include the effects of periodic optical potentials produced by stationary laser beams…
Condensate fraction and critical temperature of a trapped interacting Bose gas
S. Giorgini, L. Pitaevskii, S. Stringari
By using a mean field approach, based on the Popov approximation, we calculate the temperature dependence of the condensate fraction of an interacting Bose gas confined in an aniso…
Temperature-dependent density profiles of trapped boson-fermion mixtures
M. Amoruso, A. Minguzzi, S. Stringari +2
We present a semiclassical three-fluid model for a Bose-condensed mixture of interacting Bose and Fermi gases confined in harmonic traps at finite temperature. The model is used to…