Surprising properties of doped Mott insulators are at the heart of many quantum materials, including transition metal oxides and organic materials. The key to unraveling complex phenomena observed in these systems lies in understanding the interplay of spin and charge degrees of freedom. One of the most debated questions concerns the nature of charge carriers in a background of fluctuating spins. To shed new light on this problem, we suggest a simplified model with mixed dimensionality, where holes move through a Mott insulator unidirectionally while spin exchange interactions are two dimensional. By studying individual holes in this system, we find direct evidence for the formation of mesonic bound states of holons and spinons, connected by a string of displaced spins -- a precursor of the spin-charge separation obtained in the 1D limit of the model. Our predictions can be tested using ultracold atoms in a quantum gas microscope, allowing to directly image spinons and holons, and reveal the short-range hidden string order which we predict in this model.
Cited by 7
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Christie S. Chiu et al., String patterns in the doped Hubbard model
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Sebastian Huber et al., Signatures of correlated magnetic phases in the two-spin density matrix
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Ivana Dimitrova et al., Enhanced Superexchange in a Tilted Mott Insulator
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Serena Fazzini et al., Interaction-Induced Fractionalization and Topological Superconductivity in the Polar Molecules Anisotropic
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Krzysztof Bieniasz et al., From "weak" to "strong" hole confinement in a Mott insulator
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Annabelle Bohrdt et al., Classifying snapshots of the doped Hubbard model with machine learning
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- 1 Fabian Grusdt,
- 2 Zheng Zhu,
- 3 Tao Shi,
- 1 Eugene Demler