Single-Site Imaging of Fermions in Two-Dimensional Optical Lattices
Abstract
We report on the results obtained across the five-year AFOSR-supported project, whose goals were to develop a system capable of imaging ultracold lattice fermions with single-atom sensitivity; and using this tool to perform a quantum simulation that improves our understanding of materials. Both of these objectives were achieved. We built an ultrahigh vacuum system with exceptional optical access, and used it to image individual fermionic potassium atoms in a 527-nm-period optical lattice. Atoms remain at individual sites of a 0.3-mK-deep lattice, with a pinning lifetime of 70 seconds, while scattering thousands of photons per second. Comparison of multiple images reveals a single-atom fidelity of 94 %. These techniques are refined by combining Raman sideband cooling with electromagnetically induced transparency (EIT). We then study the transport properties of fermions in a cubic lattice through micron-scale response dynamics to an alternating external force. Our technique measures both on- and off-diagonal conductivity in one spatial plane, which provides a model-free measurement of the Hall effect.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 09, 2018
- Accession Number
- AD1060440
Entities
People
- Joseph H. Thywissen
Organizations
- University of Toronto