High Sensitivity RF Spectroscopy of a Strongly-Interacting Fermi Gas

Abstract

Rf spectroscopy is one of the most powerful probing techniques in the field of ultracold gases. We report on a novel rf spectroscopy scheme with which we can detect very weak signals of only a few atoms. Using this method, we extended the experimentally accessible photon-energies range by an order of magnitude compared to previous studies. We verify directly a universal property of fermions with short-range interactions which is a power-law scaling of the rf spectrum tail all the way up to the interaction scale. We also employ our technique to precisely measure the binding energy of Feshbach molecules in an extended range of magnetic fields. This data is used to extract a new calibration of the Feshbach resonance between the two lowest energy levels of 40K

arXiv comment4 pages, 4 figures

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Cited by in corpus (21)

• Observation of a Transition Between Dynamical Phases in a Quantum Degenerate Fermi Gas
• Spectral response and contact of the unitary Fermi gas
• Observation of a smooth polaron-molecule transition in a degenerate Fermi gas
• Contact and sum-rules in a near-uniform Fermi gas at unitarity
• Precision Test of the Limits to Universality in Few-Body Physics
• Contact and Momentum Distribution of the Unitary Fermi Gas
• Single-exposure absorption imaging of ultracold atoms using deep learning
• Absence of heating in a uniform Fermi gas created by periodic driving
• Probing open- and closed-channel p-wave resonances
• Degenerate Raman sideband cooling of 40K atoms
• In Situ Momentum Distribution Measurement of a Quantum Degenerate Fermi Gas using Raman Spectroscopy
• Optomechanical Response of a Strongly Interacting Fermi Gas
• Three-body contact for fermions. I. General relations
• Spatial adiabatic passage of ultracold atoms in optical tweezers
• Temperature dependence of $p$-wave contacts in a harmonically trapped Fermi gas
• Single atom counting in a two-color magneto-optical trap
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
• Dimer-projection contact and the clock shift of a unitary Fermi gas
• Functional-renormalization-group approach to strongly coupled Bose-Fermi mixtures in two dimensions
• Universal Relations in Long-range Quantum Spin Chains
• Pair-Condensation Peak in Radio-Frequency Dimer-Projection Spectroscopy of a Unitary Fermi Gas