Journal
PHYSICAL REVIEW A
Volume 89, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.89.013614
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Funding
- DFG research unit Strong Correlations in Multiflavor Ultracold Quantum Gases
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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 et al. [Nature (London) 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.
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