Field-assisted doublon manipulation in the Hubbard model. A quantum doublon ratchet

Abstract

For the fermionic Hubbard model at strong coupling, we demonstrate that directional transport of localized doublons (repulsively bound pairs of two particles occupying the same site of the crystal lattice) can be achieved by applying an unbiased ac field of time-asymmetric (sawtooth-like) shape. The mechanism involves a transition to intermediate states of virtually zero double occupation which are reached by splitting the doublon by fields of the order of the Hubbard interaction. The process is discussed on the basis of numerically exact calculations for small clusters, and we apply it to more complex states to manipulate the charge order pattern of one-dimensional systems.

6 pages, 6 figures

References in corpus (6)

• Quantum Simulation of Antiferromagnetic Spin Chains in an Optical Lattice
• Repulsively bound atom pairs in an optical lattice
• Mott insulators in strong electric fields
• Quenching Bloch oscillations in a strongly correlated material
• ac-driven atomic quantum motor
• Electronic correlations in double ionization of atoms in pump-probe experiments

Cited by in corpus (1)

• Mott-insulator state of cold atoms in tilted optical lattices: doublon dynamics and multi-level Landau-Zener tunneling