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Pair correlations in the two-dimensional Fermi gas.

Vudtiwat Ngampruetikorn1, Jesper Levinsen2, Meera M Parish3

  • 1T.C.M. Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Physical Review Letters
|February 4, 2014
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Summary
This summary is machine-generated.

This study investigates the two-dimensional Fermi gas at finite temperatures. We found that observed pairing gaps in high-temperature gases are likely due to strong pair correlations, not a pseudogap regime.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Two-dimensional Fermi gases exhibit complex behaviors at finite temperatures.
  • Attractive short-range interactions significantly influence the gas properties.

Purpose of the Study:

  • To determine the spectral function and contact for the normal state of a 2D Fermi gas.
  • To investigate the origin of the observed pairing gap in photoemission measurements.

Main Methods:

  • Utilizing the virial expansion for a controlled approach at high temperatures.
  • Calculating spectral functions and contact properties.

Main Results:

  • Calculated spectra qualitatively agree with experimental photoemission data.
  • Suggests the pairing gap is a high-temperature gas feature.
  • Strong pair correlations arise from an earlier crossover to bosonic dimers.

Conclusions:

  • The observed pairing gap is a characteristic of the high-temperature gas.
  • The pseudogap regime is unlikely to be the cause.
  • Pair correlations are stronger than previously thought due to early bosonic dimer crossover.