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arXiv · 1908.09870

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 is 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.

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Ivana Dimitrova, Niklas Jepsen, Anton Buyskikh, Araceli Venegas-Gomez, Jesse Amato-Grill, Andrew Daley, Wolfgang Ketterle. 2019-08-26. Enhanced Superexchange in a Tilted Mott Insulator. https://doi.org/10.1103/physrevlett.124.043204

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