Probing interaction-induced ferromagnetism in optical superlattices

Abstract

We propose a controllable method for observing interaction induced ferromagnetism in ultracold fermionic atoms loaded in optical superlattices. We first discuss how to probe and control Nagaoka ferromagnetism in an array of isolated plaquettes (four lattice sites arranged in a square). Next, we show that introducing a weak interplaquette coupling destroys the ferromagnetic correlations. To overcome this instability we propose to mediate long-range ferromagnetic correlations among the plaquettes via double-exchange processes. Conditions for experimental realization and techniques to detect such states are discussed.

Extended and final version to appear in New J. Phys. 12 pages, 6 figures.

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Cited by in corpus (14)

• Nagaoka ferromagnetism observed in a quantum dot plaquette
• Tunable superconducting coupling of quantum dots via Andreev bound states in semiconductor-superconductor nanowires
• Interaction-Dependent Photon-Assisted Tunneling in Optical Lattices: A Quantum Simulator of Strongly-Correlated Electrons and Dynamical Gauge Fields
• Nagaoka states in the SU($n$) Hubbard model
• d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules
• Effects of anisotropy and Coulomb interactions on quantum transport in a quadruple quantum-dot structure
• Polaronic mechanism of Nagaoka ferromagnetism in Hubbard models
• Ab Initio Exact Diagonalization Simulation of the Nagaoka Transition in Quantum Dots
• Phase-separated Ferromagnetism in Spin-imbalanced Fermi Atoms Loaded on an Optical Ladder: a DMRG study
• Quantum entanglement and Hawking temperature
• Magnetic polarons in two-component hard core bosons
• Exact hole-induced $SU(N)$ flavor-singlets in certain $U=\infty$ $SU(N)$ Hubbard models
• Doping control of realization of an extended Nagaoka ferromagnetic state from the Mott state
• Long-range spin transport in asymmetric quadruple quantum dots configurations