4.8 Article

Tunable Single-Ion Anisotropy in Spin-1 Models Realized with Ultracold Atoms

Journal

PHYSICAL REVIEW LETTERS
Volume 126, Issue 16, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.163203

Keywords

-

Funding

  1. NSF through the Center for Ultracold Atoms
  2. ARO-MURI Non-equilibrium Many-Body Dynamics [W911NF14-1-0003, 1506369]
  3. AFOSR-MURI Quantum Phases of Matter [FA9550-14-1-0035]
  4. ONR [N00014-17-1-2253]
  5. Vannevar-Bush Faculty Fellowship
  6. Samsung Scholarship

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This study explores nonequilibrium spin dynamics in Mott insulator plateaus, observing a resonant effect in spin alignment as lattice depth changes when exchange coupling and on-site anisotropy are similar. The results are supported by many-body numerical simulations and analytical solutions of a two-site model. The research demonstrates the importance of a uniaxial single-ion anisotropy term in stabilizing magnetism for low-dimensional magnetic materials in optical lattices.
Mott insulator plateaus in optical lattices are a versatile platform to study spin physics. Using sites occupied by two bosons with an internal degree of freedom, we realize a uniaxial single-ion anisotropy term proportional to (S-z)(2) that plays an important role in stabilizing magnetism for low-dimensional magnetic materials. Here we explore nonequilibrium spin dynamics and observe a resonant effect in the spin alignment as a function of lattice depth when exchange coupling and on-site anisotropy are similar. Our results are supported by many-body numerical simulations and are captured by the analytical solution of a two-site model.

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