Condensation Energy of a Spin-1/2 Strongly Interacting Fermi Gas

Abstract

We report a measurement of the condensation energy of a two-component Fermi gas with tunable interactions. From the equation of state of the gas, we infer the properties of the normal phase in the zero-temperature limit. By comparing the pressure of the normal phase at T=0 to that of the low-temperature superfluid phase, we deduce the condensation energy, i.e. the energy gain of the system in being in the superfluid rather than normal state. We compare our measurements to a ladder approximation description of the normal phase, and to a fixed node Monte-Carlo approach, finding excellent agreement. We discuss the relationship between condensation energy and pairing gap in the BEC-BCS crossover.

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References in corpus (9)

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Cited by in corpus (7)

• Ground-state thermodynamic quantities of homogeneous spin-$1/2$ fermions from the BCS region to the unitarity limit
• Phase structure of spin-imbalanced unitary Fermi gases
• Finite-temperature equation of state of polarized fermions at unitarity
• Direct Observation of Fragmentation in a Disordered, Strongly Interacting Fermi Gas
• Sarma phase in relativistic and non-relativistic systems
• Pairing patterns in polarized unitary Fermi gases above the superfluid transition
• SU(N) Fermi liquid at finite temperature