Ehsan Khatami: "Kinetic Ferromagnetism in a System of Strongly Interacting Lattice Fermions" скачать в хорошем качестве

Ehsan Khatami: "Kinetic Ferromagnetism in a System of Strongly Interacting Lattice Fermions"

Nagaoka famously proved that introducing a single dopant to an otherwise half-filled system of repulsively interacting electrons can transform a paramagnetic insulator into a ferromagnet through path interference. Such kinetic magnetism has recently been realized with strongly interacting fermions in a triangular optical lattice*. In this talk, I will give a quick summary of the experimental findings, including the emergence of Nagaoka polarons as extended ferromagnetic bubbles around particle dopants, and present theory results based on simulations of the Fermi-Hubbard model using the numerical linked-cluster expansions in support of these observations on both the square and triangular lattices. *Lebrat et al., Nature 629, 317 (2024) and Prichard et al., Nature 629, 323 (2024)