Linsel, Simon M. and Schollwoeck, Ulrich and Bohrdt, Annabelle and Grusdt, Fabian (2025) Emergent spinon-holon Feshbach resonance in a doped Majumdar-Ghosh model. PHYSICAL REVIEW B, 111 (5): 054430. ISSN 2469-9950, 2469-9969
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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 angleresolved photoemission spectrum (ARPES) of a doped MG model, where we introduce a spin-hole interaction that is experimentally accessible with ultracold molecules. We report abound 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NEAREST-NEIGHBOR INTERACTION; HIGH-TC SUPERCONDUCTIVITY; FERMI-LIQUID BEHAVIOR; VALENCE BOND STATE; PHYSICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Apr 2026 11:59 |
| Last Modified: | 23 Apr 2026 11:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67540 |
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