Journal
NATURE PHYSICS
Volume 14, Issue 2, Pages 173-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS4297
Keywords
-
Categories
Funding
- NSF [DMR-1607277]
- David and Lucile Packard Foundation [2016-65128]
- AFOSR Young Investigator Research Program [FA9550-16-1-0269]
- Alfred P. Sloan Foundation fellowship
- DoD through the NDSEG Fellowship Program
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1607277] Funding Source: National Science Foundation
Ask authors/readers for more resources
The attractive Fermi-Hubbard model is the simplest theoretical model for studying pairing and superconductivity of fermions on a lattice. It exhibits many interesting features including a short-coherence length at intermediate coupling and a pseudogap regime with anomalous properties. Here we study an experimental realization of this model using a two-dimensional (2D) atomic Fermi gas in an optical lattice. Using a new technique for selective imaging of doublons with a quantum gas microscope, we observe chequerboard doublon density correlations in the normal state close to half-filling. With the aid of quantum Monte Carlo simulations, we show that the measured doublon density correlations allow us to put a lower bound on the strength of s-wave pairing correlations in our system. We compare the temperature sensitivity of the doublon density correlations and the paired atom fraction and find the correlations to be a much better thermometer. Accurate thermometry of attractive lattice systems will be essential in the quest for optimizing cooling schemes to reach superfluid phases in future experiments.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available