Probing the excitation spectrum of a Fermi gas in the BCS-BEC crossover regime

Abstract

We measure excitation spectra of an ultracold gas of fermionic ${}^{40}$K atoms in the BCS-BEC crossover regime. The measurements are performed with a novel spectroscopy that employs a small modulation of the B-field close to a Feshbach resonance to give rise to a modulation of the interaction strength. With this method we observe both a collective excitation as well as the dissociation of fermionic atom pairs in the strongly interacting regime. The excitation spectra reveal the binding energy / excitation gap for pairs in the crossover region.

References in corpus (18)

• Observation of resonance condensation of fermionic atom pairs
• Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
• Observation of Bose-Einstein Condensation of Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Experimental Study of the BEC-BCS Crossover Region in Lithium 6
• Creation of ultracold molecules from a Fermi gas of atoms
• Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Resonance superfluidity in a quantum degenerate Fermi gas
• The BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
• Prospect of creating a composite fermi/bose superfluid
• Tuning p-wave interactions in an ultracold Fermi gas of atoms
• Measurement of positive and negative scattering lengths in a Fermi gas of atoms
• Radio-Frequency Spectroscopy of Ultracold Fermions
• Laser probing of atomic Cooper pairs
• Crossover temperature of Bose-Einstein condensation in an atomic Fermi gas
• Single-particle excitations and the order parameter for a trapped superfluid Fermi gas

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