Pauli paramagnetism of an ideal Fermi gas

Abstract

We show how to use trapped ultracold atoms to measure the magnetic susceptibility of a two-component Fermi gas. The method is illustrated for a non-interacting gas of ${}^6$Li, using the tunability of interactions around a wide Feshbach resonances. The susceptibility versus effective magnetic field is directly obtained from the inhomogeneous density profile of the trapped atomic cloud. The wings of the cloud realize the high field limit where the polarization approaches 100%, which is not accessible for an electron gas.

5 pages, 4 figures

References in corpus (5)

• Theory of ultracold Fermi gases
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Phase diagram of a two-component Fermi gas with resonant interactions
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

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• Magnetic properties of spin-1/2 Fermi gases with ferromagnetic interaction
• Spin susceptibility and effects of inhomogeneous strong pairing fluctuations in a trapped ultracold Fermi gas