Phase structure of spin-imbalanced unitary Fermi gases

Abstract

We investigate the phase structure of spin-imbalanced unitary Fermi gases beyond mean-field theory by means of the Functional Renormalization Group. In this approach, quantum and thermal fluctuations are resolved in a systematic manner. The discretization of the effective potential on a grid allows us to accurately account for both first- and second-order phase transitions that are present on the mean-field level. We compute the full phase diagram in the plane of temperature and spin-imbalance and discuss the existence of other conjectured phases such as the Sarma phase and a precondensation region. In addition, we explain on a qualitative level how we expect that in-situ density images are affected by our findings and which experimental signatures may potentially be used to probe the phase structure.

version published in Phys.Rev.A; 14 pages, 6 figures

References in corpus (46)

• Many-Body Physics with Ultracold Gases
• Exact evolution equation for the effective potential
• Theory of ultracold Fermi gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
• Resonantly-paired fermionic superfluids
• Thermodynamics of the BCS-BEC crossover
• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
• Phase diagram of a two-component Fermi gas with resonant interactions
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Normal state of a polarized Fermi gas at unitarity
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
• Ultra-cold Polarized Fermi Gases
• Epsilon expansion for a Fermi gas at infinite scattering length
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Excitation spectra and rf-response near the polaron-to-molecule transition from the functional renormalization group
• Renormalization Group Approach towards the QCD Phase Diagram
• BCS-BEC crossover at finite temperature in the broken-symmetry phase
• A Unitary Fermi Supersolid: The Larkin-Ovchinnikov Phase
• Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas
• Large-N expansion for unitary superfluid Fermi gases
• Fermi gas near unitarity around four and two spatial dimensions
• Flow Equations for the BCS-BEC Crossover
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Renormalization Group Theory for the Imbalanced Fermi Gas
• Thermodynamics of balanced and slightly spin-imbalanced Fermi gases at unitarity
• Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity
• Ultracold atoms and the Functional Renormalization Group
• Universal Aspects of QCD-like Theories
• Functional renormalization for quantum phase transitions with non-relativistic bosons
• Renormalization group flow for fermionic superfluids at zero temperature
• Renormalisation Flow and Universality for Ultracold Fermionic Atoms
• Next-to-next-to-leading-order epsilon expansion for a Fermi gas at infinite scattering length
• The role of interactions in spin-polarised atomic Fermi gases at unitarity
• Renormalization of the BCS-BEC crossover by order parameter fluctuations
• BEC-BCS Crossover in the Epsilon Expansion
• Imaginary polarization as a way to surmount the sign problem in ab initio calculations of spin-imbalanced Fermi gases
• Finite-size and confinement effects in spin-polarized trapped Fermi gases
• Error estimates and specification parameters for functional renormalization

Cited by in corpus (12)

• Phase structure of mass- and spin-imbalanced unitary Fermi gases
• Superfluid signatures in a dissipative quantum point contact
• Renormalization group study of Bose polarons
• Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
• Renormalization theory for the Fulde-Ferrell-Larkin-Ovchinnikov states at $T>0$
• Sarma phase in relativistic and non-relativistic systems
• Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
• Pairing patterns in polarized unitary Fermi gases above the superfluid transition
• Stability of the Fulde-Ferrell-Larkin-Ovchinnikov states in anisotropic systems and critical behavior at thermal $m$-axial Lifshitz points
• Low-energy modes of spin-imbalanced Fermi gases in BCS phase
• The Gor'kov and Melik-Barkhudarov correction to an imbalanced Fermi gas in the presence of impurities
• A lattice pairing-field approach to ultracold Fermi gases