Emergent spinon-holon Feshbach resonance in a doped Majumdar-Ghosh model
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| Format: | Preprint |
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2024
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| _version_ | 1866913697472970752 |
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| author | Linsel, Simon M. Schollwöck, Ulrich Bohrdt, Annabelle Grusdt, Fabian |
| author_facet | Linsel, Simon M. Schollwöck, Ulrich Bohrdt, Annabelle Grusdt, Fabian |
| contents | Experimental and numerical spectroscopy have revealed rich physics in antiferromagnets, in particular in frustrated and doped systems. The Majumdar-Ghosh (MG) model has an analytically known spin-disordered ground state of dimerized singlets as a result of magnetic frustration. Here we study the single-hole angle-resolved photoemission spectrum (ARPES) of a doped MG model, where we introduce a spin-hole interaction that is experimentally accessible with ultracold molecules. We report a bound spinon-holon ground state and clear signatures of a spinon-holon molecule state and polarons in the ARPES spectrum at different magnetizations. Moreover, we find signatures of an emergent Feshbach resonance with tunable interactions associated with the unbinding of the spinon and the holon. Our results provide new insights into the physics of dopants in frustrated $t$-$J$ models and establish the latter as a new platform for studies of emergent few-body phenomena. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_08264 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Emergent spinon-holon Feshbach resonance in a doped Majumdar-Ghosh model Linsel, Simon M. Schollwöck, Ulrich Bohrdt, Annabelle Grusdt, Fabian Strongly Correlated Electrons Quantum Gases Superconductivity Quantum Physics Experimental and numerical spectroscopy have revealed rich physics in antiferromagnets, in particular in frustrated and doped systems. The Majumdar-Ghosh (MG) model has an analytically known spin-disordered ground state of dimerized singlets as a result of magnetic frustration. Here we study the single-hole angle-resolved photoemission spectrum (ARPES) of a doped MG model, where we introduce a spin-hole interaction that is experimentally accessible with ultracold molecules. We report a bound spinon-holon ground state and clear signatures of a spinon-holon molecule state and polarons in the ARPES spectrum at different magnetizations. Moreover, we find signatures of an emergent Feshbach resonance with tunable interactions associated with the unbinding of the spinon and the holon. Our results provide new insights into the physics of dopants in frustrated $t$-$J$ models and establish the latter as a new platform for studies of emergent few-body phenomena. |
| title | Emergent spinon-holon Feshbach resonance in a doped Majumdar-Ghosh model |
| topic | Strongly Correlated Electrons Quantum Gases Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2406.08264 |