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Physical review. B, Condensed matter

Stability of two-dimensional Fermi liquids against pair fluctuations with large total momentum

Joseph W. Serene

Published Dec 1, 1989• 58 citations
Publisher

Abstract

Independent pair fluctuations with large total momentum do not cause an instability in a degenerate two-dimensional Fermi liquid with a weak attractive interaction.Received 5 July 1989DOI:https://doi.org/10.1103/PhysRevB.40.10873©1989 American Physical Society

DOI
10.1103/physrevb.40.10873

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Independent pair fluctuations with large total momentum do not cause an instability in a degenerate two-dimensional Fermi liquid with a weak attractive interaction.Received 5 July 1989DOI:https://doi.org/10.1103/PhysRevB.40.10873©1989 American Physical Society
We realize and study an attractively interacting two-dimensional Fermi liquid. Using momentum-resolved photoemission spectroscopy, we measure the self-energy, determine the contact parameter of the short-range interaction potential, and find their dependence on the interaction strength. We successfully compare the measurements to a theoretical analysis, properly taking into account the finite temperature, harmonic trap, and the averaging over several two-dimensional gases with different peak densities.