Experimental Study of the BEC-BCS Crossover Region in Lithium 6

Abstract

We report Bose-Einstein condensation of weakly bound ${}^6$Li${}_2$molecules in a crossed optical trap near a Feshbach resonance. We measure a molecule-molecule scattering length of$170_{-60}^{+100}$ nm at 770 G, in good agreement with theory.We study the expansion of the cloud in the BEC-BCS crossoverregion.

4 pages, 3 figures, submitted to PRL

References in corpus (25)

• Theory of Bose-Einstein condensation in trapped gases
• Observation of resonance condensation of fermionic atom pairs
• Formation of a Matter-Wave Bright Soliton
• Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
• Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
• Observation of Bose-Einstein Condensation of Molecules
• Creation of ultracold molecules from a Fermi gas of atoms
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Superfluid Fermi Gases with Large Scattering Length
• Resonance superfluidity in a quantum degenerate Fermi gas
• The BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
• Evolution of a Bose-condensed gas under variations of the confining potential
• Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas
• Measurement of interaction energy near a Feshbach resonance in a 6Li Fermi gas
• Fermi systems with long scattering lengths
• Three-body decay of a rubidium Bose-Einstein condensate
• Expansion of an interacting Fermi gas
• Lifetime of molecule-atom mixtures near a Feshbach resonance in 40K
• Mechanical Stability of a Strongly-Interacting Fermi Gas of Atoms
• The critical temperature of a trapped, weakly interacting Bose gas
• Achieving a BCS transition in an atomic Fermi gas
• Resonance theory of the crossover from Bardeen-Cooper-Schrieffer superfluidity to Bose-Einstein condensation in a dilute Fermi gas
• Elementary excitations in trapped Bose gases beyond mean field approximation
• Bose-Einstein transition in a dilute interacting gas
• Feshbach resonance in dense ultracold Fermi gases

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• Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Toward an AdS/cold atoms correspondence: a geometric realization of the Schroedinger symmetry
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• Non-Abelian Topological Order in S-Wave Superfluids of Ultracold Fermionic Atoms
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• Efimov Physics: a review
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• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
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• Temperature of a trapped unitary Fermi gas at finite entropy
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• Universal Fermi Gas with Two- and Three-Body Resonances
• Contrasting the wide Feshbach resonances in ${}^6$Li and ${}^7$Li
• Ultracold two-component Fermi gases with a magnetic field gradient near a Feshbach resonance
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• Intense slow beams of bosonic potassium isotopes
• Ultracold molecules from ultracold atoms: a case study with the KRb molecule
• Conventional character of the BCS-BEC cross-over in ultra-cold gases of 40K
• Resummation of fermionic in-medium ladder diagrams to all orders
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• Superconductivity in doped inversion-symmetric Weyl semimetals
• Universality in Phase Transitions for Ultracold Fermionic Atoms
• Low temperature properties of the infinite-dimensional attractive Hubbard model
• Correlated Gaussian Hyperspherical Method for Few-Body Systems
• Pseudopotential in resonant regimes
• Observation of "broad" d-wave Feshbach resonances with a triplet structure
• Majorana corner modes with solitons in an attractive Hubbard-Hofstadter model of cold atom optical lattices
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• Finite-Temperature Properties of Attractive Three-Component Fermionic Atoms in Optical Lattices
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• Total control over ultracold interactions via electric and magnetic fields
• Fermi-Fermi Mixtures in the Strong Attraction Limit
• Trapping Fermionic ${}^{40}$K and Bosonic ${}^{87}$Rb on a Chip
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• A two-channel R-matrix analysis of magnetic field induced Feshbach resonances
• Pair condensation and bound states in fermionic systems
• Do mixtures of bosonic and fermionic atoms adiabatically heat up in optical lattices?
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• Chromomagnetic stability of the three flavor Larkin-Ovchinnikov-Fulde-Ferrell phase of QCD
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• The induced interaction in a Fermi gas with a BEC-BCS crossover
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• Nonzero orbital angular momentum superfluidity in ultracold Fermi gases
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• Dissociation dynamics of a Bose-Einstein condensate of molecules
• Quasi two-dimensional superfluid Fermi gases
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• Controlling nuclear spin exchange via optical Feshbach resonances in ${}^{171}$Yb
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• Universal clusters as building blocks of stable quantum matter
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• Theory for p-Wave Feshbach Molecules
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• Strongly interacting fermions in an optical lattice
• Exact BCS stochastic schemes for a time dependent many-body fermionic system
• Coherent population trapping and dynamical instability in the nonlinearly coupled atom-molecule system
• Density and spin response functions in ultracold fermionic atom gases
• Phase separated charge density wave phase in two species extended Bose-Hubbard model
• Trap-imbalanced fermion mixtures
• Quantitative analysis of losses close to a d-wave open-channel Feshbach resonance in Potassium 39
• 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
• Collisionally inhomogeneous Bose-Einstein condensates in double-well potentials
• Dipole Oscillations in Fermionic Mixtures
• Dressed molecules in an optical lattice
• The Contact in the BCS-BEC crossover for finite range interacting ultracold Fermi gases
• Revealing Majorana Fermion states in a superfluid of cold atoms subject to a harmonic potential
• Inhomogeneous state of few-fermion superfluids
• Topological quantum phase transitions and edge states in spin-orbital coupled Fermi gases
• Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in Optical Lattices: A Dynamical Mean-Field-Theory Study
• Emergent Spin Liquids in the Hubbard Model on the Anisotropic Honeycomb Lattice
• Formation of molecules from a Cs Bose-Einstein condensate
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Signatures of the BCS-BEC crossover in the yrast spectra of Fermi quantum rings
• Functional Theory for Bose-Einstein Condensates
• Quantum Atom Optics: Theory and Applications to Quantum Technology
• Stripe Formation in Fermionic Atoms on 2-D Optical Lattice inside a Box Trap: DMRG Studies for Repulsive Hubbard Model with Open Boundary Condition
• Correlations in the low-density Fermi gas: Fermi-Liquid state, Dimerization, and BCS Pairing
• Polarized superfluids near their tricritical point
• Synthetic magnetic fluxes on the honeycomb lattice
• Dynamics and thermalization of Bose-Einstein condensate in Sinai oscillator trap
• A new many-body wave function for BCS-BEC crossover in Fermi gases
• Coherence and correlation properties of a one-dimensional attractive Fermi gas
• Trapped p-wave superfluids: a local density approach
• Thermal bosons in 3d optical lattices via tensor networks
• Vortex core states in superfluid Fermi-Fermi mixtures with unequal masses
• Mott transitions in the Hubbard model with spatially-modulated interactions
• Ideal gas matching for thermal Galilean holography
• Feshbach resonances in a nonseparable trap
• Multiband superfluidity and superfluid to band-insulator transition of strongly interacting fermions in an optical lattice
• Application of lasers to ultracold atoms and molecules
• BCS-BEC Crossover in the Two-Dimensional Attractive Hubbard Model: Variational Cluster Approach
• Ultracold atom-dimer long-range interactions beyond the $1/R^n$ expansion
• Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction
• Dynamic structure factor of Fermi superfluid in the BEC-BCS crossover
• Phase transitions in the boson-fermion resonance model in one dimension
• Effective field theory of boson-fermion mixtures and bound fermion states on a vortex of boson superfluid
• Sympathetic cooling route to Bose-Einstein condensate and Fermi-liquid mixtures
• Heteronuclear fermionic superfluids with spin degrees of freedom
• Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling
• Dark Solitary Waves in a Class of Collisionally Inhomogeneous Bose-Einstein Condensates
• Dissipative Transport of Trapped Bose-Einstein Condensates through Disorder
• The internal Josephson effect in a Fermi gas near a Feshbach resonance
• Collective modes of Fermi superfluid containing vortices along the BEC-BCS crossover
• Interaction and coherence in 2D bilayers
• Heteronuclear quantum gas mixtures
• Endpoint thermodynamics of an atomic Fermi gas subject to a Feshbach resonance
• Core repulsion effects in alkali trimers
• On the specific heat of a fermionic atomic cloud in the unitary regime
• LOFF and breached pairing with cold atoms
• Emergent non-trivial lattices for topological insulators
• Transdimensional equivalence of universal constants for Fermi gases at unitarity
• Meson Scattering in a Pion Superfluid
• Effects of three-body scattering processes on BCS-BEC crossover
• Study of the Born-Oppenheimer Approximation for Mass-Scaling of Cold Collision Properties
• Ultra-low threshold polariton condensation
• Efimov physics implications at $p$-wave fermionic unitarity
• Exact renormalisation group flow for ultracold Fermi gases in unitary limit
• Spatial structure of the pair wavefunction and the density correlation functions at the BEC-BCS crossover
• $P$-wave Efimov physics implications at unitarity
• Breathing mode frequencies of a rotating Fermi gas in the BCS-BEC crossover region
• Coherent macroscopic quantum tunneling in boson-fermion mixtures
• Phase transitions in quasi-one dimensional system with unconventional superconductivity
• Collective excitations of low density fermion-boson quantum-liquid mixtures
• Laser cooling all the way down to molecular condensate
• Calibrating the absorption imaging of cold atoms under high magnetic fields
• Frustrated orbital Feshbach resonances in a Fermi gas
• Quantum Many-Body Calculations using Body-Centered Cubic Lattices
• Entropy of a Turbulent Bose-Einstein Condensate
• Particle Density Distributions in Fermi Gas Superfluids: Molecular Boson Effects
• Higgs modes in two-dimensional spatially-indirect exciton condensates
• Effective action for superfluid Fermi systems in the strong-coupling limit
• Width and shift of Fano-Feshbach resonances for van der Waals interactions
• Resonant Manipulation of d-wave Interaction of Cold Atoms with Two Lasers and a Magnetic Field
• Linear response of heat conductivity of normal-superfluid interface of a polarized Fermi gas to orbital magnetic field
• Magnetic Feshbach resonances in collisions of non-magnetic closed-shell ${}^1\Sigma$ molecules
• Fast in situ observation of atomic Feshbach resonances by photoassociative ionization
• Superfluidity in density imbalanced bilayers of dipolar fermions
• Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
• Spatial instabilities in a cloud of cold atoms
• Adiabatic Phase Diagram of an Ultracold Atomic Fermi Gas with a Feshbach Resonance
• Do phase fluctuations influence the Fulde-Ferrell-Larkin-Ovchinnikov state in a 3D Fermi gas?
• On the kinetic energy of unitary Fermi gas in a harmonic trap
• Analytic normal mode frequencies for N identical particles: The microscopic dynamics underlying the emergence and stability of excitation gaps from BCS to unitarity
• Competition between the Fulde-Ferrell-Larkin-Ovchinnikov phase and the BCS phase in the presence of an optical potential
• Symmetry-enriched Bose-Einstein condensates in spin-orbit coupled bilayer system
• Charge-impurity-induced Majorana fermions in topological superconductors
• Stability of FFLO states in optical lattices with bilayer structure
• Sympathetic cooling of trapped fermions by bosons in the presence of particle losses
• Few-body ultracold reactions in a Bose-Fermi mixture
• Interplay of interlayer pairing and many-body screening in a bilayer of dipolar fermions
• Anomalous loss behavior in a single-component Fermi gas close to a $p$-Wave Feshbach resonance
• Circulating Current States in Bilayer Fermionic and Bosonic Systems
• Matter-wave interference in s-wave and p-wave Fermi condensates
• How creating one additional well can generate Bose-Einstein condensation
• Resonant Superfluidity in an Optical Lattice
• Observation of collectivity enhanced magnetoassociation of ${}^6$Li in the quantum degenerate regime
• Three-body contact for fermions. I. General relations
• Ultracold Fermion Cooling Cycle using Heteronuclear Feshbach Resonances
• Magnetic-field-induced tunability of spin Hamiltonians: Resonances and Efimov states in Yb${}_2$Ti${}_2$O${}_7$
• Numerical study of unitary fermions in one spatial dimension
• Asymmetric Conductivity of the Kondo Effect in Cold Atomic Systems
• Composite boson signature in the interference pattern of atomic dimer condensates
• Fermionic superfluidity: From high Tc superconductors to ultracold Fermi gases
• Phase diagram of asymmetric Fermi gas across Feshbach resonance
• Scattering resonances and pairing in a Rabi-coupled Fermi gas
• Low energy density correlation function of the degenerate unitary Fermi gas from epsilon expansion
• Critical temperature in the BCS-BEC crossover with spin-orbit coupling
• Nonlinear Transport of Bose-Einstein Condensates Through Waveguides with Disorder
• The Fermionic Density-functional at Feshbach Resonance
• Effect of impurities on the transition temperature of a dilute dipolar tapped Bose gase
• Unitary limit and linear scaling of neutrons in harmonic trap with tuned CD-Bonn and square-well interactions
• Nonrelativistic fermions with holographic interactions and the unitary Fermi gas
• Matter-Wave Solitons in the Presence of Collisional Inhomogeneities: Perturbation theory and the impact of derivative terms
• Delayed response of a fermion-pair condensate to a modulation of the interaction strength
• EPR pairing dynamics in Hubbard model with resonant $U$
• Analytic models of ultra-cold atomic collisions at negative energies for application to confinement-induced resonances
• Dynamical mean-field equations for strongly interacting fermionic atoms in a potential trap
• Cornwall-Jackiw-Tomboulis effective field theory to nonuniversal equation of state of an ultracold Bose gas
• Quasi-particle properties of trapped Fermi gases
• Unitary Fermi gas in the epsilon expansion
• Super-shell structure in harmonically trapped fermionic gases and its semi-classical interpretation
• Bogoliubov spectrum of a cigar shaped Fermi superfluid in an optical lattice at the BEC-BCS crossover
• An Effective Series Expansion to the Equation of State of Unitary Fermi Gases
• Vortices in Fermi gases with spin-dependent rotation potentials
• Engineering Majorana Kramers Pairs In Synthetic High Spin Chern Insulators
• When does a Fermi puddle become a Fermi sea? Emergence of pairing in two-dimensional trapped mesoscopic Fermi gases
• Resonance-facilitated three-channel p-wave scattering
• The normal state of attractive Fermi gases from coupled-cluster theory
• Faraday Waves in strongly interacting superfluids
• Pauli blocking of light scattering in degenerate fermions
• Ultracold collisions in the Yb-Li mixture system
• Flow and critical velocity of an imbalanced Fermi gas through an optical potential
• Unconventional color superfluidity in ultra-cold fermions: Quintuplet pairing, quintuple point and pentacriticality
• Damping-free collective oscillations of a driven two-component Bose gas in optical lattices
• Two-state Bogoliubov theory of a molecular Bose gas
• Contact potential instability in the path-integral description of itinerant ferromagnetism
• Quantum Effects In Low Temperature Bosonic Systems
• Repulsively diverging gradient of the density functional in the Reduced Density Matrix Functional Theory
• Critical scaling of the AC conductivity and momentum dissipation
• Heisenberg Symmetry and Collective Modes of One Dimensional Unitary Correlated Fermions
• Effect of mediated interactions on a Hubbard chain in mixed-dimensional fermionic cold atoms
• Equivalence of dissipative and dissipationless dynamics of interacting quantum systems with its application to the unitary Fermi gas
• Composite Bosons Superposition Ansatz Approach to One-Dimensional Trapped Few-Fermion Systems
• Direct observation of Feshbach enhanced $s$-wave scattering of fermions
• Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction
• Negative Echo in the Density Evolution of Ultracold Fermionic Gases
• Quantum simulation of the Hubbard model with ultracold fermions in optical lattices
• Molecular regimes in ultracold Fermi gases
• Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas
• Superfluid gap formation in a fermionic optical lattice with spin imbalanced populations
• The inverse-square interaction phase diagram: unitarity in the bosonic ground state