Enhanced Superexchange in a Tilted Mott Insulator
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 th...
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| Veröffentlicht in: | Physical review letters 2020-01, Vol.124 (4), p.043204-043204, Article 043204 |
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| container_issue | 4 |
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| container_title | Physical review letters |
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| creator | Dimitrova, Ivana Jepsen, Niklas Buyskikh, Anton Venegas-Gomez, Araceli Amato-Grill, Jesse Daley, Andrew Ketterle, Wolfgang |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevLett.124.043204 |
| format | Article |
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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Fluids Mass transport Optical lattices Spin dynamics Superfluidity |
| title | Enhanced Superexchange in a Tilted Mott Insulator |
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