A two-dimensional Fermi liquid with attractive interactions

TL;DR

This paper reports on the experimental realization and analysis of a two-dimensional Fermi liquid with attractive interactions, measuring self-energy and contact parameter, and comparing results with theoretical models.

Contribution

It provides the first detailed experimental measurements of self-energy and contact in a 2D attractive Fermi liquid, including finite temperature and trap effects.

Findings

Measured self-energy and contact parameter dependence on interaction strength

Achieved agreement between experimental data and theoretical models

Demonstrated control over 2D Fermi liquid properties

Abstract

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.