Fermi-Liquid Behavior of the Normal Phase of a Strongly Interacting Gas of Cold Atoms

TL;DR

This study experimentally measures the magnetic susceptibility of a strongly interacting Fermi gas at low temperatures, confirming Fermi-liquid behavior and aligning with quantum Monte Carlo calculations, thus enhancing understanding of its excitations.

Contribution

It provides the first precise experimental verification of Fermi-liquid theory in a strongly interacting cold Fermi gas, matching advanced theoretical predictions.

Findings

Magnetic susceptibility measurements agree with quantum Monte Carlo calculations.

Results support the Landau theory of Fermi liquids.

Insights into the excitations of the normal phase of strongly interacting Fermi gases.

Abstract

We measure the magnetic susceptibility of a Fermi gas with tunable interactions in the low-temperature limit and compare it to quantum Monte Carlo calculations. Experiment and theory are in excellent agreement and fully compatible with the Landau theory of Fermi liquids. We show that these measure- ments shed new light on the nature of the excitations of the normal phase of a strongly interacting Fermi gas.