Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session S00: Poster Session III (4pm-6pm CDT)
4:00 PM,
Thursday, June 6, 2024
Room: Hall BC
Abstract: S00.00116 : Ferro- and Ferrimagnetic States of Ultracold Fermions in a Hubbard System
Presenter:
Martin Lebrat
(Harvard University)
Authors:
Martin Lebrat
(Harvard University)
Muqing Xu
(Harvard University)
Lev H Kendrick
(Harvard University)
Anant Kale
(Harvard University)
Youqi Gang
(Harvard University)
Pranav Seetharaman
(San Jose State University)
Ivan Morera
(University of Barcelona)
Ehsan Khatami
(San Jose State University)
Eugene Demler
(ETH Zurich)
Markus Greiner
(Harvard University)
Here, we report on two cold-atom realizations of intriguing magnetic states arising in Hubbard systems where interactions are large compared to kinetic energy scales. First, we demonstrate the existence of Nagaoka polarons in a particle-doped Mott insulator, imaged as extended ferromagnetic bubbles around single particle dopants that are stabilized by quantum path interference. Key to our observations is a triangular lattice, where kinetic magnetism is strongly enhanced due to frustration and the existence of short-length loops. Second, we report on the existence of a ferrimagnetic state realized in a Lieb lattice at half-filling, a paradigmatic example of a flat-band system whose large state degeneracy is lifted by weak interactions. This ferrimagnetic state is characterized by antialigned magnetic moments concomitant with a finite spin polarization. We demonstrate its robustness when increasing repulsive interactions to the Heisenberg regime, and study its emergence when continuously tuning the lattice unit cell from a square to a Lieb geometry. Future progress augurs the exploration of exotic low-temperature phases such as quantum spin liquids in kagome lattices and striped phases in cuprate compounds.
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