Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas

Abstract

We demonstrate a reversible conversion of a Li2 molecular Bose-Einstein condensate to a degenerate Fermi gas of atoms by adiabatically crossing a Feshbach resonance. By optical in situ imaging, we observe a smooth change of the cloud size in the crossover regime. On the Feshbach resonance, the ensemble is strongly interacting and the measured cloud size is 75(7)% of the one of a non-interacting zero-temperature Fermi gas. The high condensate fraction of more than 90% and the adiabatic crossover suggest our Fermi gas to be cold enough to form a superfluid.

arXiv comment5 pages, 4 figures, accepted by PRL

References in corpus (20)

• Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
• Observation of Bose-Einstein Condensation of Molecules
• Collective excitations of a trapped Bose-condensed gas
• Creation of ultracold molecules from a Fermi gas of atoms
• Superfluid Fermi Gases with Large Scattering Length
• Conversion of an Atomic Fermi Gas to a Long-Lived Molecular Bose Gas
• Resonance superfluidity in a quantum degenerate Fermi gas
• The BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
• Universal Thermodynamics of Degenerate Quantum Gases in the Unitarity Limit
• Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas
• Prospect of creating a composite fermi/bose superfluid
• Measurement of interaction energy near a Feshbach resonance in a 6Li Fermi gas
• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Fermi systems with long scattering lengths
• Condensate fraction and critical temperature of a trapped interacting Bose gas
• Elastic and inelastic collisions of 6Li in magnetic and optical traps
• Mechanical Stability of a Strongly-Interacting Fermi Gas of Atoms
• Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6-Li
• Feshbach resonance in dense ultracold Fermi gases
• Shrinking of a condensed fermionic cloud in a trap approaching the BEC limit

Cited by in corpus (475)

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• Production of cold molecules via magnetically tunable Feshbach resonances
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Pairing and Phase Separation in a Polarized Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Experimental Study of the BEC-BCS Crossover Region in Lithium 6
• Toward an AdS/cold atoms correspondence: a geometric realization of the Schroedinger symmetry
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• Equation of state of a Fermi gas in the BEC-BCS crossover: a quantum Monte Carlo study
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• Precise determination of ${}^6$Li cold collision parameters by radio-frequency spectroscopy on weakly bound molecules
• Localization of bosonic atoms by fermionic impurities in a 3d optical lattice
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• Ultracold mixtures of atomic Li-6 and Cs-133 with tunable interactions
• Ultracold atom-molecule collisions and bound states in magnetic fields: tuning zero-energy Feshbach resonances in He-NH (3Sigma-)
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• Controlling a quantum gas of polar molecules in an optical lattice
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• The ground state energy at unitarity
• BCS/BEC crossover in Quark Matter and Evolution of its Static and Dynamic properties
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• Non-standard pairing in asymmetric trapped Fermi gases
• Lattice Monte Carlo calculations for unitary fermions in a finite box
• How does an interacting many-body system tunnel through a potential barrier to open space?
• When Superconductivity Crosses Over: From BCS to BEC
• Temperature of a trapped unitary Fermi gas at finite entropy
• Observation of electrically tunable Feshbach resonances in twisted bilayer semiconductors
• Lattice Monte Carlo calculations for unitary fermions in a harmonic trap
• Self-trapping of a Fermi super-fluid in a double-well potential in the BEC-unitarity crossover
• Universal Fermi Gas with Two- and Three-Body Resonances
• Sound propagation in elongated superfluid fermion clouds
• Ultracold two-component Fermi gases with a magnetic field gradient near a Feshbach resonance
• Conventional character of the BCS-BEC cross-over in ultra-cold gases of 40K
• Broad versus narrow Fano-Feshbach resonances in the BCS-BEC crossover with trapped Fermi atom
• Resummation of fermionic in-medium ladder diagrams to all orders
• Mean-field phase diagram of disordered bosons in a lattice at non-zero temperature
• Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
• Thermodynamics of a trapped unitary Fermi gas
• Atom-dimer scattering for confined ultracold fermion gases
• Next-to-next-to-leading-order epsilon expansion for a Fermi gas at infinite scattering length
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• Efimov effect from functional renormalization
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• Compressibility of an Ultracold Fermi Gas with Repulsive Interactions
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• Phase structure of spin-imbalanced unitary Fermi gases
• BCS-BEC crossover of collective excitations in two-band superfluids
• Density Profiles of Strongly Interacting Trapped Fermi Gases
• Finite-Temperature Properties of Attractive Three-Component Fermionic Atoms in Optical Lattices
• Bulk viscosities for cold Fermi superfluids close to the unitary limit
• Two-field optical methods to control magnetic Feshbach resonances
• Superfluidity of p-wave and s-wave atomic Fermi gases in optical lattices
• Trapping Fermionic ${}^{40}$K and Bosonic ${}^{87}$Rb on a Chip
• Sound modes at the BCS-BEC crossover
• A two-channel R-matrix analysis of magnetic field induced Feshbach resonances
• Exact results for the 1D interacting Fermi gas with arbitrary polarization
• Two-band superfluidity from the BCS to the BEC limit
• The Efimov effect in lithium 6
• Concavity of the collective excitation branch of a Fermi gas in the BEC-BCS crossover
• Coherent molecular bound states of bosons and fermions near a Feshbach resonance
• Renormalization of the BCS-BEC crossover by order parameter fluctuations
• Four-body problem and BEC-BCS crossover in a quasi-one-dimensional cold fermion gas
• Chromomagnetic stability of the three flavor Larkin-Ovchinnikov-Fulde-Ferrell phase of QCD
• Dynamical vertex approximation for the attractive Hubbard model
• Local density approximation for a perturbative equation of state
• Tunable three-body interactions in driven two-component Bose-Einstein condensates
• Pairing of few Fermi atoms in one dimension
• From Low-Density Neutron Matter to the Unitary Limit
• Theoretical model for ultracold molecule formation via adaptive feedback control
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• Breakdown of the local density approximation in interacting systems of cold fermions in strongly anisotropic traps
• Thermodynamics of ultracold trapped gases. Generalized mechanical variables, equation of state and heat capacity
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Collective Excitations of Strongly Interacting Fermi Gases of Atoms in a Harmonic Trap
• Pseudogap phenomena in ultracold atomic Fermi gases
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• Quantum phase transition for the BEC--BCS crossover in condensed matter physics and CPT violation in elementary particle physics
• A possible Efimov trimer state in a 3-component lithium-6 mixture
• Bound states of a localized magnetic impurity in a superfluid of paired ultracold fermions
• Bose-Einstein Condensation with Entangled Order Parameter
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• Trapped fermionic clouds distorted from the trap shape due to many-body effects
• Low-density molecular gas of tightly-bound Rashba-Dresselhaus fermions
• Phase diagrams for an ideal gas mixture of fermionic atoms and bosonic molecules
• Nonequilibrium States of a Quenched Bose Gas
• Superfluid phases of the three-species fermion gas
• Observation of dipolar splittings in high-resolution atom-loss spectroscopy of ${}^6$Li $p$-wave Feshbach resonances
• Popov approximation for composite bosons in the BCS-BEC crossover
• Dimer-dimer collisions at finite energies in two-component Fermi gases
• Dressed Feshbach molecules in the BEC-BCS crossover
• Pair tunneling of two atoms out of a trap
• Continuous feedback on a quantum gas coupled to an optical cavity
• Post-quench dynamics and pre-thermalization in a resonant Bose gas
• Dynamics of Strongly Interacting Fermi Gases of Atoms in a Harmonic Trap
• Nonzero orbital angular momentum superfluidity in ultracold Fermi gases
• Radiofrequency spectroscopy of ${}^6$Li p-wave molecules: towards photoemission spectroscopy of a p-wave superfluid
• Comparison between a diagrammatic theory for the BCS-BEC crossover and Quantum Monte Carlo results
• Experimental conditions for observation of electron-hole superfluidity in GaAs heterostructures
• BEC-BCS Crossover in the Epsilon Expansion
• Observation of interference between two molecular Bose-Einstein condensates
• Stable gapless superconductivity at strong coupling
• Supersolids in confined fermions on one-dimensional optical lattices
• Quantum liquid-crystal order in resonant atomic gases
• Atom-molecule theory of broad Feshbach resonances
• Bose-Einstein Condensation of Particle-Hole Pairs in Ultracold Fermionic Atoms Trapped within Optical Lattices
• Theory for p-Wave Feshbach Molecules
• Analyzing Feshbach resonances -- A ${}^6$Li -${}^{133}$Cs case study
• Zero-temperature equation of state of mass-imbalanced resonant Fermi gases
• Methods for Preparing Quantum Gases of Lithium
• Chemical reactivity of ultracold polar molecules: investigation of H + HCl and H + DCl collisions
• Single-particle excitations in the BCS-BEC crossover region II: Broad Feshbach resonance
• 2d Galilean Field Theories with Anisotropic Scaling
• Ground State Properties of Fermi Gases in the Strongly Interacting Regime
• Collectively Enhanced Interactions in Solid-state Spin Qubits
• Three-phonon and four-phonon interaction processes in a pair-condensed Fermi gas
• All-optical production and transport of a large ${}^6$Li quantum gas in a crossed optical dipole trap
• Broad Feshbach resonances in ultracold alkali-metal systems
• Creation of p-wave Feshbach molecules in the selected angular momentum states using an optical lattice
• Precision benchmark calculations for four particles at unitarity
• Ultracold gases far from equilibrium
• Itinerant Ferromagnetism in ultracold Fermi gases
• A Molecular Matter-Wave Amplifier
• Understanding the superfluid phase diagram in trapped Fermi gases
• Is an Ultra-Cold Strongly Interacting Fermi Gas a Perfect Fluid?
• Density correlations in ultracold atomic Fermi gases
• Dark solitons dynamics and snake instability in superfluid Fermi gases trapped by an anisotropic harmonic potential
• Charge-Hyperscaling Violating Lifshitz hydrodynamics from black-holes
• The symmetric heavy-light ansatz
• Effective field theory and dispersion law of the phonons of a non-relativistic superfluid
• Laser Cooling of Transition Metal Atoms
• Number statistics of molecules formed from ultra-cold atoms
• Quantum degenerate Fermi gas in an orbital optical lattice
• Ground state energy of unitary fermion gas with the Thomson Problem approach
• Ground-state energy of the unitary Fermi gas from the epsilon expansion
• Theory of Ultracold Superstrings
• Finite Temperature Momentum Distribution of a Trapped Fermi Gas
• Boson-Fermion Resonance Model in One Dimension
• Thermodynamic signatures for topological phase transitions to Majorana and Weyl superfluids in ultracold Fermi gases
• Scattering properties of weakly bound dimers of fermionic atoms
• Controlling the pair momentum of the FFLO state in a 3D Fermi gas through a 1D periodic potential
• Hyperspherical Description of the Degenerate Fermi Gas: S-wave Interactions
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• Atomic Fermi gas at the unitary limit by quantum Monte Carlo methods: Effects of the interaction range
• Strongly interacting Fermi systems in 1/N expansion: From cold atoms to color superconductivity
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• Role of Particle Interactions in the Feshbach Conversion of Fermion Atoms to Bosonic Molecules
• BCS-BEC crossover in a trapped Fermi super-fluid using a density-functional equation
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• Electro-association of ultracold dipolar molecules into tetramer field-linked states
• Hyperscaling-Violating Lifshitz hydrodynamics from black-holes: Part II
• Generalized Mean Field Approach to a Resonant Bose-Fermi Mixture
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• Trapped Resonant Fermions above Superfluid Transition Temperature
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• Thermal blurring of a coherent Fermi gas
• Finite-density corrections to the Unitary Fermi gas: A lattice perspective from Dynamical Mean-Field Theory
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• Appropriate probe condition for absorption imaging of ultracold ${}^6$Li atoms
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• Auxiliary field formalism for dilute fermionic atom gases with tunable interactions
• Instability of superfluid Fermi gases induced by a roton-like density mode in optical lattices
• Fermionic ground state at unitarity and Haldane Exclusion Statistics
• Spin-polarized Fermi superfluids as Bose-Fermi mixtures
• Effective theory for the Goldstone field in the BCS-BEC crossover at T=0
• Optimal cooling strategies for magnetically trapped atomic Fermi-Bose mixtures
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• Low-temperature chemistry using the R-matrix method
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• Universal behavior of a trapped Fermi superfluid in the BCS-unitarity crossover
• BEC-BCS crossover of a trapped Fermi gas without using the local density approximation
• Spectral splits of neutrinos as a BCS-BEC crossover type phenomenon
• Cold Atom Optical Lattices as Quantum Analog Simulators for Aperiodic One-Dimensional Localization Without Disorder
• All-optical production of ${}^6\text{Li}$ molecular BEC in excited hyperfine levels
• Three-body crossover from a Cooper triple to bound trimer state in three-component Fermi gases near a triatomic resonance
• Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover
• Unitary $p$-wave Fermi gas in one dimension
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• BCS pairing in a trapped dipolar Fermi gase
• Breathing modes of a fast rotating Fermi gas
• Particle number fractionalization of a one-dimensional atomic Fermi gas with synthetic spin-orbit coupling
• Nonrelativistic CFTs at Large Charge: Casimir Energy and Logarithmic Enhancements
• Density and spin response functions in ultracold fermionic atom gases
• Realization of BEC-BCS crossover physics in a compact oven-loaded magneto-optic trap apparatus
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• A simple mean field equation for condensates in the BEC-BCS crossover regime
• Theory of non-Hermitian fermionic superfluidity on a honeycomb lattice: Interplay between exceptional manifolds and van Hove Singularity
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• Formation of magnetic impurities and pair-breaking effect in a superfluid Fermi gas
• Atom-molecule equilibration in a degenerate Fermi gas with resonant interactions
• Operator spectrum of nonrelativistic CFTs at large charge
• Dressed-molecules in resonantly-interacting ultracold atomic Fermi gases
• Medium effects and the shear viscosity of the dilute Fermi gas away from the conformal limit
• Dynamical Response of Fermi Condensate to Varying Magnetic Fields
• Variational Monte Carlo analysis of the Hubbard model with a confining potential: one-dimensional fermionic optical lattice systems
• Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in Optical Lattices: A Dynamical Mean-Field-Theory Study
• Evolution of Cooper pairs with zero-center-of-mass momentum and their first-order correlation function in a two-dimensional ultracold Fermi gas near the observed Berezinskii-Kosterlitz-Thouless transition
• Kohn's theorem in a superfluid Fermi gas with a Feshbach resonance
• Functional Theory for Bose-Einstein Condensates
• Relativistic BCS-BEC crossover of a two-species Fermi gas with number density asymmetry at zero temperature
• Topological quantum phase transition in the BEC-BCS crossover phenomena
• Fermionic superfluidity with positive scattering length
• Coherence and correlation properties of a one-dimensional attractive Fermi gas
• Atomic Quantum Corrals for Bose-Einstein Condensates
• Second order quantum phase transition of a homogeneous Bose gas with attractive interactions
• Thermodynamic Properties of Rashba Spin-Orbit-Coupled Fermi Gas
• A new many-body wave function for BCS-BEC crossover in Fermi gases
• Ideal gas matching for thermal Galilean holography
• An Investigation of Mean-field Effects for a Bose Condensate in an Optical Lattice
• Thermodynamical approaches to efficient sympathetic cooling in ultracold Fermi-Bose atomic mixtures
• Correlations in the low-density Fermi gas: Fermi-Liquid state, Dimerization, and BCS Pairing
• Dipole oscillations of fermionic superfluids along the BEC-BCS crossover in disordered potentials
• Dynamical process of optically trapped singlet ground state ${}^{85}$Rb${}^{133}$Cs molecules produced via short-range photoassociation
• Phase transitions in the boson-fermion resonance model in one dimension
• Ultracold atom-dimer long-range interactions beyond the $1/R^n$ expansion
• $D$-dimensions Dirac fermions BEC-BCS cross-over thermodynamics
• BCS-BEC Crossover in the Two-Dimensional Attractive Hubbard Model: Variational Cluster Approach
• Heteronuclear fermionic superfluids with spin degrees of freedom
• Effective field theory of boson-fermion mixtures and bound fermion states on a vortex of boson superfluid
• Finite Temperature Properties of Three-Component Fermion Systems in Optical Lattice
• Spectral properties of a Rydberg atom immersed in a Bose-Einstein condensate
• Dynamic structure factor of Fermi superfluid in the BEC-BCS crossover
• Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction
• Photoassociation dynamics in a Bose-Einstein condensate
• Landau-Khalatnikov phonon damping in strongly interacting Fermi gases
• Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling
• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules
• Beyond mean-field corrections to the quasiparticle spectrum of superfluid Fermi gases
• Endpoint thermodynamics of an atomic Fermi gas subject to a Feshbach resonance
• Effects of three-body scattering processes on BCS-BEC crossover
• Heteronuclear quantum gas mixtures
• Effective Lagrangian of unitary Fermi gas from $\epsilon$ expansion
• Collective modes of Fermi superfluid containing vortices along the BEC-BCS crossover
• LOFF and breached pairing with cold atoms
• Core repulsion effects in alkali trimers
• Emergent non-trivial lattices for topological insulators
• On the specific heat of a fermionic atomic cloud in the unitary regime
• Sweeping a molecular Bose-Einstein condensate across a Feshbach resonance
• Density correlations in ultracold Fermi systems within the exact Richardson solution
• Exact renormalisation group flow for ultracold Fermi gases in unitary limit
• Pairing gaps in atomic gases at the BCS-BEC crossover
• Analytical Results for Cold Asymmetrical Fermion Superfluids at the Mean-Field Level
• Effective action for superfluid Fermi systems in the strong-coupling limit
• Quantum Many-Body Calculations using Body-Centered Cubic Lattices
• Calibrating the absorption imaging of cold atoms under high magnetic fields
• Frustrated orbital Feshbach resonances in a Fermi gas
• Adiabatic Phase Diagram of an Ultracold Atomic Fermi Gas with a Feshbach Resonance
• Dynamical effects on superconductivity in BCS-BEC crossover
• Symmetry-enriched Bose-Einstein condensates in spin-orbit coupled bilayer system
• Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
• Do phase fluctuations influence the Fulde-Ferrell-Larkin-Ovchinnikov state in a 3D Fermi gas?
• Molecule formation as a diagnostic tool for second order correlations of ultra-cold gases
• On the kinetic energy of unitary Fermi gas in a harmonic trap
• Molecular formations in ultracold mixtures of interacting and noninteracting atomic gases
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Dipolar Bose-Einstein condensate for large scattering length
• Feshbach molecule formation through an oscillating magnetic field: subharmonic resonances
• Superfluid neutron matter with a twist
• Matter-wave interference in s-wave and p-wave Fermi condensates
• Reconstruction of the phase of matter-wave fields using a momentum resolved cross-correlation technique
• Three-body contact for fermions. I. General relations
• Development of an apparatus for cooling 6Li-87Rb Fermi-Bose mixtures in a light-assisted magnetic trap
• How creating one additional well can generate Bose-Einstein condensation
• Magnonic spin current shot noise in an itinerant Fermi gas
• Entanglement in Lifshitz Fermion Theories
• Dominant Andreev Reflection through Nonlinear Radio-Frequency Transport
• Causality, universality, and effective field theory for van der Waals interactions
• Anomalous loss behavior in a single-component Fermi gas close to a $p$-Wave Feshbach resonance
• Magnetic Impurities in Two-Dimensional Superfluid Fermi Gas with Spin-Orbit Coupling
• Signatures of macroscopic quantum coherence in ultracold dilute Fermi gases
• Superfluid/ferromagnet/superfluid junction and $\pi$-phase in a superfluid Fermi gas
• Collective excitation and stability of flow-induced gapless Fermi superfluids
• Micro-integrated crossed-beam optical dipole trap system with long-term alignment stability for mobile atomic quantum technologies
• Floquet-Engineering of Feshbach Resonances in Ultracold Gases
• Low energy density correlation function of the degenerate unitary Fermi gas from epsilon expansion
• Signatures of Superfluidity in Dilute Fermi Gases near a Feshbach Resonance
• The Fermionic Density-functional at Feshbach Resonance
• Fast quantum gate via Feshbach-Pauli blocking in a nanoplasmonic trap
• Critical currents in the BEC/BCS crossover regime
• Effect of impurities on the transition temperature of a dilute dipolar tapped Bose gase
• Nonrelativistic fermions with holographic interactions and the unitary Fermi gas
• Bose-representation for a strongly coupled nonequilibrim fermionic superfluid in a time-dependent trap
• Delayed response of a fermion-pair condensate to a modulation of the interaction strength
• Ultra-cold fermions in optical lattices
• Superfluid-Normal Quantum Phase Transitions in an Imbalanced Fermi Gas
• Leading Order $k_{F}a$ Corrections to the Free Energy and Phase Separation in Two-component Fermion Systems
• Super-shell structure in harmonically trapped fermionic gases and its semi-classical interpretation
• Coupled First-Order Transitions In A Fermi-Bose Mixture
• Contact potential instability in the path-integral description of itinerant ferromagnetism
• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses
• Quantum Monte Carlo study of the metal-insulator crossover in the square-lattice Hubbard model
• Coupled-cluster theory of a gas of strongly-interacting fermions in the dilute limit
• Bogoliubov spectrum of a cigar shaped Fermi superfluid in an optical lattice at the BEC-BCS crossover
• Unconventional color superfluidity in ultra-cold fermions: Quintuplet pairing, quintuple point and pentacriticality
• Critical scaling of the AC conductivity and momentum dissipation
• Crossover from Integer to Fractional Quantum Hall Effect
• Heisenberg Symmetry and Collective Modes of One Dimensional Unitary Correlated Fermions
• Consequences of the Pauli exclusion principle for the Bose-Einstein condensation of atoms and excitons
• Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction
• Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas
• Repulsively diverging gradient of the density functional in the Reduced Density Matrix Functional Theory
• Characterizing Real-space Topology in Rice-Mele Model by Thermodynamics
• Regime of Validity of the Pairing Hamiltonian in the Study of Fermi Gases
• Pairing based cooling of Fermi gases
• The inverse-square interaction phase diagram: unitarity in the bosonic ground state
• Effect of mediated interactions on a Hubbard chain in mixed-dimensional fermionic cold atoms