Enhanced superexchange in a tilted mott insulator

Dimitrova, Ivana and Jepsen, Niklas and Buyskikh, Anton and Venegas-Gomez, Araceli and Amato-Grill, Jesse and Daley, Andrew and Ketterle, Wolfgang (2020) Enhanced superexchange in a tilted mott insulator. Physical Review Letters, 124 (4). 043204. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.124.043204)

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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.

  • Item type:Article
    ID code:72009
    Dates:
    Date
    Event
    31 January 2020
    Published
    26 August 2019
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:07 Apr 2020 13:48
    Last modified:14 Apr 2024 00:52
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/72009
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