Enhanced Superexchange in a Tilted Mott Insulator

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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• Spin transport in a tunable Heisenberg model realized with ultracold atoms
• Exploration of doped quantum magnets with ultracold atoms
• Catching Bethe phantoms and quantum many-body scars: Long-lived spin-helix states in Heisenberg magnets
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• Strong pairing in mixed dimensional bilayer antiferromagnetic Mott insulators
• Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock
• Realization of a Bosonic Antiferromagnet
• Tunable Single-Ion Anisotropy in Spin-1 Models Realized with Ultracold Atoms
• Formation of spontaneous density-wave patterns in DC driven lattices
• Photo-induced nonequilibrium states in Mott insulators
• Z2 parton phases in the mixed-dimensional $t-J_z$ model
• Tunable-spin-model generation with spin-orbit-coupled fermions in optical lattices
• Simulation of Dynamical Quantum Phase Transition of the 1D Transverse Ising Model with a Double-chain Bose-Hubbard model
• Dynamical signatures of thermal spin-charge deconfinement in the doped Ising model
• Driven-dissipative control of cold atoms in tilted optical lattices
• Quantifying hole-motion-induced frustration in doped antiferromagnets by Hamiltonian reconstruction
• Two component quantum walk in one-dimensional lattice with hopping imbalance
• Spin dynamics dominated by superexchange via virtual molecules
• ${\mathbb{Z}}_2$ phases and Majorana spectroscopy in paired Bose-Hubbard chains
• Floquet-surface bound states in the continuum in a resonantly driven 1D tilted defect-free lattice
• The rotor Jackiw-Rebbi model: a cold-atom approach to chiral symmetry restoration and quark confinement
• Particle zoo in a doped spin chain: Correlated states of mesons and magnons
• Simulation of classical Ising-like magnetism with a Mott insulator of paired atoms
• Dynamics of spin helices in the diluted one-dimensional $XX$ model
• Proposal for realizing unpaired Weyl points in a three-dimensional periodically driven optical Raman lattice