1. Time-resolved pairing gap spectroscopy in a quantum simulator of fermionic superfluidity inside an optical cavity
- Author
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Young, Dylan J., Song, Eric Yilun, Chu, Anjun, Barberena, Diego, Niu, Zhijing, Schäfer, Vera M., Lewis-Swan, Robert J., Rey, Ana Maria, and Thompson, James K.
- Subjects
Condensed Matter - Quantum Gases ,Physics - Atomic Physics ,Quantum Physics - Abstract
We use an ensemble of laser-cooled strontium atoms in a high-finesse cavity to cleanly emulate the technique of rf spectroscopy employed in studies of BEC-BCS physics in fermionic superfluids of degenerate cold gases. Here, we leverage the multilevel internal structure of the atoms to study the physics of Cooper pair breaking in this system. In doing so, we observe and distinguish the properties of two distinct many-body gaps, the BCS pairing gap and the spectral gap, using nondestructive readout techniques. The latter is found to depend on the populations of the internal atomic states, reflecting the chemical potential dependence predicted in fermionic superfluids. This work opens the path for more fully exploiting the rich internal structure of atoms in cavity QED emulators to study both analogous systems and also more exotic states yet to be realized., Comment: Main Text with Supplementary Material, 15 pages, 5 figures
- Published
- 2024