Resonant Driving induced Ferromagnetism in the Fermi Hubbard Model
arXiv:1808.03966 · doi:10.1103/PhysRevA.99.043629
Abstract
In this letter we consider quantum phases and the phase diagram of a Fermi Hubbard model under periodic driving that has been realized in recent cold atom experiments, in particular, when the driving frequency is resonant with the interaction energy. Due to the resonant driving, the effective Hamiltonian contains a correlated hopping term where the density occupation strongly modifies the hopping strength. Focusing on half filling, in addition to the charge and spin density wave phases, large regions of ferromagnetic phase and phase separation are discovered in the weakly interacting regime. The mechanism of this ferromagnetism is attributed to the correlated hopping because the hopping strength within a ferromagnetic domain is normalized to a larger value than the hopping strength across the domain. Thus, the kinetic energy favors a large ferromagnetic domain and consequently drives the system into a ferromagnetic phase. We note that this is a different mechanism in contrast to the well-known Stoner mechanism for ferromagnetism where the ferromagnetism is driven by interaction energy.
arXiv comment5 pages, 5 figures in main text
References in corpus (28)
- Atomic quantum gases in periodically driven optical lattices
- Experimental realization of a long-range antiferromagnet in the Hubbard model with ultracold atoms
- High-frequency approximation for periodically driven quantum systems from a Floquet-space perspective
- Single-atom imaging of fermions in a quantum-gas microscope
- Spin and Charge Resolved Quantum Gas Microscopy of Antiferromagnetic Order in Hubbard Chains
- A Quantum Gas Microscope for Fermionic Atoms
- Observation of Spatial Charge and Spin Correlations in the 2D Fermi-Hubbard Model
- Site-resolved measurement of the spin-correlation function in the Hubbard model
- Bad metallic transport in a cold atom Fermi-Hubbard system
- Microscopic Observation of Pauli Blocking in Degenerate Fermionic Lattice Gases
- Revealing Hidden Antiferromagnetic Correlations in Doped Hubbard Chains via String Correlators
- Site-resolved imaging of a fermionic Mott insulator
- Schrieffer-Wolff Transformation for Periodically Driven Systems: Strongly Correlated Systems with Artificial Gauge Fields
- Imaging and addressing of individual fermionic atoms in an optical lattice
- Observation of canted antiferromagnetism with ultracold fermions in an optical lattice
- Spin Transport in a Mott Insulator of Ultracold Fermions
- Enhancement and sign change of magnetic correlations in a driven quantum many-body system
- Quantum gas microscopy of an attractive Fermi-Hubbard system
- Observation of 2D fermionic Mott insulators of K with single-site resolution
- Effective Hamiltonians for fastly driven many-body lattice systems
- Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction
- Floquet dynamics in driven Fermi-Hubbard systems
- Direct observation of incommensurate magnetism in Hubbard chains
- Triplet superconductivity in quasi one-dimensional systems
- Quantum simulation of correlated-hopping models with fermions in optical lattices
- Conductivity spectrum of ultracold atoms in an optical lattice
- Anomalous flux quantization in a Hubbard ring with correlated hopping
- Correlated Spin-Flip Tunneling in a Fermi Lattice Gas