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Enhanced Superexchange in a Tilted Mott Insulator.

Ivana Dimitrova1, Niklas Jepsen1, Anton Buyskikh2

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Adding a force to optical lattices suppresses mass transport, enabling faster, tunable spin dynamics. This allows for the study of pure spin transport in larger, more stable many-body spin systems.

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Area of Science:

  • Quantum simulation
  • Atomic physics
  • Condensed matter physics

Background:

  • First-order tunneling drives entropy and mass transport in optical lattices, outperforming spin transport via superexchange.
  • Controlling spin dynamics in many-body systems is crucial for quantum technologies.

Purpose of the Study:

  • Investigate the effect of a constant force (tilt) on transport mechanisms in optical lattices.
  • Explore novel control of spin Hamiltonians and dynamics.
  • Enable the study of pure spin dynamics in stabilized, larger quantum systems.

Main Methods:

  • Utilized an optical lattice setup with a tunable constant force (tilt).
  • Manipulated superexchange rates by over two orders of magnitude.
  • Varied spin-spin interactions through tilt control.

Main Results:

  • A constant force (tilt) was shown to suppress first-order tunneling while preserving spin transport.
  • The superfluid transition was suppressed, allowing for stabilization of larger systems.
  • Achieved unprecedented control over superexchange rates and spin-spin interactions.

Conclusions:

  • A tilted optical lattice provides a novel platform for controlling quantum transport.
  • This method enables the study of pure spin dynamics in defect-free, larger systems.
  • Offers new possibilities for engineering quantum Hamiltonians and advancing quantum simulations.