Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916729816350720 |
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| author | Lebrat, Martin Xu, Muqing Kendrick, Lev Haldar Kale, Anant Gang, Youqi Seetharaman, Pranav Morera, Ivan Khatami, Ehsan Demler, Eugene Greiner, Markus |
| author_facet | Lebrat, Martin Xu, Muqing Kendrick, Lev Haldar Kale, Anant Gang, Youqi Seetharaman, Pranav Morera, Ivan Khatami, Ehsan Demler, Eugene Greiner, Markus |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12269 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator Lebrat, Martin Xu, Muqing Kendrick, Lev Haldar Kale, Anant Gang, Youqi Seetharaman, Pranav Morera, Ivan Khatami, Ehsan Demler, Eugene Greiner, Markus Quantum Gases Strongly Correlated Electrons Quantum Physics 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. |
| title | Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator |
| topic | Quantum Gases Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2308.12269 |