Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator
- URL: http://arxiv.org/abs/2308.12269v1
- Date: Wed, 23 Aug 2023 17:37:34 GMT
- Title: Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator
- Authors: Martin Lebrat, Muqing Xu, Lev Haldar Kendrick, Anant Kale, Youqi Gang,
Pranav Seetharaman, Ivan Morera, Ehsan Khatami, Eugene Demler, Markus Greiner
- Abstract summary: Nagaoka insulator famously proved that introducing a single itinerant charge can transform a paramagnetic insulator into a ferromagnet through path interference.
Here we demonstrate the emergence of Nagaoka polarons in a Hubbard system realized with strongly interacting fermions in a triangular optical lattice.
- Score: 0.1319201600959248
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum interference can deeply alter the nature of many-body phases of
matter. In the paradigmatic case of the Hubbard model, Nagaoka famously proved
that introducing a single itinerant charge can transform a paramagnetic
insulator into a ferromagnet through path interference. However, a microscopic
observation of such kinetic magnetism induced by individually imaged dopants
has been so far elusive. Here we demonstrate the emergence of Nagaoka polarons
in a Hubbard system realized with strongly interacting fermions in a triangular
optical lattice. Using quantum gas microscopy, we reveal these polarons as
extended ferromagnetic bubbles around particle dopants arising from the local
interplay of coherent dopant motion and spin exchange. In contrast, kinetic
frustration due to the triangular geometry promotes antiferromagnetic polarons
around hole dopants, as proposed by Haerter and Shastry. Our work augurs the
exploration of exotic quantum phases driven by charge motion in strongly
correlated systems and over sizes that are challenging for numerical
simulation.
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