Enhanced Superexchange in a Tilted Mott Insulator
Name
PhysRevLett.124.043204.pdf
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553.45 KB
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Checksum (MD5)
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Author(s)
Dimitrova, Ivana Ljubomirova
Jepsen, Niklas
Buyskikh, Anton
Venegas-Gomez, Araceli
Amato-Grill, Jesse
Daley, Andrew
Ketterle, Wolfgang
Date Issued
January 2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Dimitrova, Ivana, et al. "Enhanced Superexchange in a Tilted Mott Insulator." Physical Review Letters, 124, 4 (January 2020): 043204. © 2020 American Physical Society
Version
Final published version
Abstract
In an optical lattice, entropy and mass transport by first-order tunneling are much faster than spin transport via superexchange. Here we show that adding a constant force (tilt) suppresses first-order tunneling, but not spin transport, realizing new features for spin Hamiltonians. Suppression of the superfluid transition can stabilize larger systems with faster spin dynamics. For the first time in a many-body spin system, we vary superexchange rates by over a factor of 100 and tune spin-spin interactions via the tilt. In a tilted lattice, defects are immobile and pure spin dynamics can be studied.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.124.043204
