Enhanced superexchange in a tilted mott insulator

Ivana Dimitrova, Niklas Jepsen, Anton Buyskikh, Araceli Venegas-Gomez, Jesse Amato-Grill, Andrew Daley, Wolfgang Ketterle

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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.

Original languageEnglish
Article number043204
Number of pages6
JournalPhysical Review Letters
Volume124
Issue number4
DOIs
Publication statusPublished - 31 Jan 2020

Keywords

  • tilted lattice
  • optical lattice
  • superexchange

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  • Cite this

    Dimitrova, I., Jepsen, N., Buyskikh, A., Venegas-Gomez, A., Amato-Grill, J., Daley, A., & Ketterle, W. (2020). Enhanced superexchange in a tilted mott insulator. Physical Review Letters, 124(4), [043204]. https://doi.org/10.1103/PhysRevLett.124.043204