Enhanced superexchange in a tilted mott insulator

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
3 Downloads (Pure)


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
Issue number4
Publication statusPublished - 31 Jan 2020


  • tilted lattice
  • optical lattice
  • superexchange


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