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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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High-temperature pairing in a strongly interacting two-dimensional Fermi gas
Puneet A Murthy1, Mathias Neidig2, Ralf Klemt2
1Physics Institute, Heidelberg University, Heidelberg, Germany. murthy@physi.uni-heidelberg.de.
Science (New York, N.Y.)
|December 23, 2017
Summary
Many-body pairing correlations in ultracold fermionic atoms persist at high temperatures, exceeding two-body binding energy. These strong correlations in the normal phase are driven by many-body effects, not just individual particle interactions.
Area of Science:
- Quantum Many-Body Physics
- Condensed Matter Physics
- Ultracold Atomic Gases
Background:
- Understanding the normal phase of strongly correlated fermionic systems is a key challenge.
- The role of pairing correlations in these systems, especially at high temperatures, remains unclear.
Purpose of the Study:
- To investigate many-body pairing energy in two-dimensional ultracold fermionic atoms.
- To determine the influence of temperature and interaction strength on pairing.
- To elucidate the driving mechanisms behind pairing in the normal phase.
Main Methods:
- Utilized spatially resolved radio-frequency spectroscopy.
- Measured pairing energy across a broad range of temperatures and interaction strengths.
- Studied a two-dimensional gas of ultracold fermionic atoms.
Main Results:
- Observed significant many-body pairing at temperatures well above the superfluid critical temperature.
- In the strongly interacting regime, pairing energy surpassed the two-body binding energy.
- Pairing energy demonstrated a clear dependence on local atomic density.
Conclusions:
- Pairing in strongly interacting two-dimensional fermionic systems is primarily driven by many-body correlations.
- These pairing correlations exhibit remarkable robustness against thermal fluctuations.
- The findings shed light on the complex nature of the normal phase in strongly correlated fermions.
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