Pairing effects in the non-degenerate limit of the two-dimensional Fermi gas

Abstract

The spectral function of a spin-balanced two-dimensional Fermi gas with short-range interactions is calculated by means of a quantum cluster expansion. Good qualitative agreement is found with a recent experiment by Feld $\text{et al.}$ [Nature (London) $\text{480}$, 75 (2011)]. The effects of pairing are clearly visible in the density of states, which displays a suppression of spectral weight due to the formation of a two-body bound state. In addition, the momentum distribution and the radio-frequency spectrum are derived, which are in excellent agreement with exact universal results. It is demonstrated that in the limit of high temperature, the quasiparticle excitations are well defined, allowing for a kinetic description of the gas.

11 pages, 9 figures, updated to status of published version

References in corpus (15)

• Many-Body Physics with Ultracold Gases
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Radiofrequency spectroscopy of a strongly interacting two-dimensional Fermi gas
• Viscosity and scale invariance in the unitary Fermi gas
• Exact Relations for a Strongly-interacting Fermi Gas near a Feshbach Resonance
• Pseudo-gap pairing in ultracold Fermi atoms
• Exact few-body results for strongly correlated quantum gases in two dimensions
• Apparent low-energy scale invariance in two-dimensional Fermi gases
• Pair Correlations in the Two-Dimensional Fermi Gas
• Scale breaking and fluid dynamics in a dilute two-dimensional Fermi gas
• Pseudogap and preformed pairs in the imbalanced Fermi gas in two dimensions
• Low-dimensional pairing fluctuations and pseudogapped photoemission spectrum in a trapped two-dimensional Fermi gas
• Short-distance properties of Coulomb systems
• Electron spin resonance in a dilute magnon gas as a probe of magnon scattering resonances

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• Pairing effects in the normal phase of a two-dimensional Fermi gas
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• Bulk viscosity and contact correlations in attractive Fermi gases
• Quantum anomaly and thermodynamics of one-dimensional fermions with three-body interactions
• Fermi-to-Bose crossover in a trapped quasi-2D gas of fermionic atoms
• High-temperature expansion for interacting fermions
• Enhancing the Efimov correlation in Bose polarons with large mass imbalance
• Comparison of strong-coupling theories for a two-dimensional Fermi gas
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• Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity
• Visualizing the BEC-BCS crossover in the two-dimensional Fermi gas: pairing gaps and dynamical response functions from ab initio computations
• Tan's two-body contact across the superfluid transition of a planar Bose gas
• Collective modes of a two-dimensional Fermi gas at finite temperature
• High Temperature Virial Expansion to Universal Quench Dynamics
• Effective theory for ultracold strongly interacting fermionic atoms in two dimensions
• The virial expansion of attractively interacting Fermi gases in 1D, 2D, and 3D, up to fifth order
• Leading- and next-to-leading order semiclassical approximation to the first seven virial coefficients of spin-1/2 fermions across spatial dimensions
• Exact Quantum Virial Expansion for the Optical Response of Doped Two-Dimensional Semiconductors
• Harmonically trapped fermions in two dimensions: ground-state energy and contact of SU(2) and SU(4) systems via nonuniform lattice Monte Carlo
• Pseudogap regime of a strongly interacting two-dimensional Fermi gas with and without confinement-induced effect range of interactions
• Third- and fourth-order virial coefficients of harmonically trapped fermions in a semiclassical approximation
• Universal relations and normal-state properties of a Fermi gas with laser-dressed mixed-partial-wave interactions
• Role of the confinement-induced effective range on the thermodynamics of a strongly correlated Fermi gas in two dimensions
• Universal relations for spin-orbit-coupled Fermi gases in two and three dimensions
• Spectral density, Levinson's theorem, and the extra term in the second virial coefficient for 1D delta-function potential
• Bulk viscosity of resonantly interacting fermions in the quantum virial expansion
• Second-order virial expansion for an atomic gas in a harmonic waveguide
• Quantum anomaly and thermodynamics of one-dimensional fermions with antisymmetric two-body interactions