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Decay of the relative phase domain wall into confined vortex pairs: the case of a coherently coupled bosonic mixture
Albert Gallemí, Lev P. Pitaevskii, Sandro Stringari +1
A domain wall of relative phase in a flattened harmonically-trapped Bose-Einstein condensed mixture of two atomic hyperfine states, subject to a stationary Rabi coupling of intensi…
Magnetic defects in an unbalanced mixture of two Bose-Einstein condensates
A. Gallemí, 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…
Collisionless sound in a uniform two-dimensional Bose gas
Miki Ota, Fabrizio Larcher, Franco Dalfovo +3
Using linear response theory within the Random Phase Approximation, we investigate the propagation of sound in a uniform two dimensional (2D) Bose gas in the collisionless regime.…
Spin-orbit-coupling induced localization in the expansion of an interacting Bose-Einstein condensate
Chunlei Qu, Lev P. Pitaevskii, Sandro Stringari
By developing a hydrodynamic formalism, we investigate the expansion dynamics of the single-minimum phase of a binary spin-orbit coupled Bose-Einstein condensate, after releasing f…
Magnetic solitons in Rabi-coupled Bose-Einstein condensates
Chunlei Qu, Marek Tylutki, Sandro Stringari +1
We study magnetic solitons, solitary waves of spin polarization (i.e., magnetization), in binary Bose-Einstein condensates in the presence of Rabi coupling. We show that the system…
Expansion of harmonically trapped interacting particles and time dependence of the contact
Chunlei Qu, Lev P. Pitaevskii, Sandro Stringari
We study the expansion of an interacting atomic system at zero temperature, following its release from an isotropic three-dimensional harmonic trap and calculate the time dependenc…
Superfluid Density of a Spin-orbit Coupled Bose Gas
Yi-Cai Zhang, Zeng-Qiang Yu, Tai Kai Ng +3
We discuss the superfluid properties of a Bose-Einstein condensed gas with spin-orbit coupling, recently realized in experiments. We find a finite normal fluid density at zer…
Magnetic Solitons in a Binary Bose-Einstein Condensate
Chunlei Qu, Lev P. Pitaevskii, Sandro Stringari
We study solitary waves of polarization (magnetic solitons) in a two-component Bose gas with slightly unequal repulsive intra- and interspin interactions. In experimentally relevan…
Confinement and precession of vortex pairs in coherently coupled Bose-Einstein condensates
Marek Tylutki, Lev P. Pitaevskii, Alessio Recati +1
The dynamic behavior of vortex pairs in two-component coherently (Rabi) coupled Bose-Einstein condensates is investigated in the presence of harmonic trapping. We discuss the role…
Second Sound in Ultracold Atomic Gases
Lev P. Pitaevskii, Sandro Stringari
We provide an overview of the recent theoretical and experimental advances in the study of second sound in ultracold atomic gases. Starting from the Landau two fluid hydrodynamic e…
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.…
Hybridization of first and second sound in a weakly-interacting Bose gas
Lucas Verney, Lev Pitaevskii, Sandro Stringari
Using Landau's theory of two-fluid hydrodynamics we investigate the sound modes propagating in a uniform weakly-interacting superfluid Bose gas for values of temperature, up to 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…
Observation of Solitonic Vortices in Bose-Einstein Condensates
Simone Donadello, Simone Serafini, Marek Tylutki +4
We observe solitonic vortices in an atomic Bose-Einstein condensate after free expansion. Clear signatures of the nature of such defects are the twisted planar density depletion ar…
Hydrodynamic theory of motion of quantized vortex rings in trapped superfluid gases
Lev P. Pitaevskii
I study vortex ring oscillations in a superfluid, trapped in an elongated trap, under the conditions of the Local Density Approximation. On the basis of the Hamiltonian formalism I…
Snake instability of dark solitons in fermionic superfluids
A. Cetoli, J. Brand, R. G. Scott +2
We present numerical calculations of the snake instability in a Fermi superfluid within the Bogoliubov-de Gennes theory of the BEC to BCS crossover using the random phase approxima…
Supercurrent and dynamical instability of spin-orbit-coupled ultracold Bose gases
Tomoki Ozawa, Lev P. Pitaevskii, Sandro Stringari
We investigate the stability of supercurrents in a Bose-Einstein condensate with one-dimensional spin-orbit and Raman couplings. The consequence of the lack of Galilean invariance…
Superstripes and the excitation spectrum of a spin-orbit-coupled Bose-Einstein condensate
Yun Li, Giovanni I. Martone, Lev P. Pitaevskii +1
Using Bogoliubov theory we calculate the excitation spectrum of a spinor Bose-Einstein condensed gas with equal Rashba and Dresselhaus spin-orbit coupling in the stripe phase. The…
Second sound and the superfluid fraction in a resonantly interacting Fermi gas
Leonid A. Sidorenkov, Meng Khoon Tey, Rudolf Grimm +3
Superfluidity is a macroscopic quantum phenomenon, which shows up below a critical temperature and leads to a peculiar behavior of matter, with frictionless flow, the formation of…
Scaling solutions of the two fluid hydrodynamic equations in a harmonically trapped gas at unitarity
Yan-Hua Hou, Lev P. Pitaevskii, Sandro Stringari
We prove that the two fluid Landau hydrodynamic equations, when applied to a gas interacting with infinite scattering length (unitary gas) in the presence of harmonic trapping, adm…
First and second sound in a highly elongated Fermi gas at unitarity
Yan-Hua Hou, Lev P. Pitaevskii, Sandro Stringari
We consider a Fermi gas at unitarity trapped by a highly elongated harmonic potential and solve the equations of two fluid hydrodynamics at finite temperature. The propagation of s…
Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
Meng Khoon Tey, Leonid A. Sidorenkov, Edmundo R. Sánchez Guajardo +6
We provide a joint theoretical and experimental investigation of the temperature dependence of the collective oscillations of first sound nature exhibited by a highly elongated har…
Lieb's soliton-like excitations in harmonic trap
G. E. Astrakharchik, L. P. Pitaevskii
We study the solitonic Lieb II branch of excitations in one-dimensional Bose-gas in homogeneous and trapped geometry. Using Bethe-ansatz Lieb's equations we calculate the "effectiv…
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…