The fate of the spin polaron in the 1D antiferromagnets
| Autor: | Wrzosek, Piotr, Kosinski, Adam, Wang, Yao, Berciu, Mona, Agrapidis, Clio E., Wohlfeld, Krzysztof |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | SciPost Phys. 17, 018 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.21468/SciPostPhys.17.1.018 |
| Popis: | The stability of the spin polaron quasiparticle, well established in studies of a single hole in the 2D antiferromagnets, is investigated in the 1D antiferromagnets using a t-J model. We perform an exact slave fermion transformation to the holon-magnon basis, and diagonalize numerically the resulting model in the presence of a single hole. We demonstrate that the spin polaron collapses - and the spin-charge separation takes over - due to the specific role played by the magnon-magnon interactions and the magnon hard-core constraint in the 1D t-J model. Moreover, we prove that the spin polaron is stable for any strength of the magnon-magnon interaction other than the unique value found in a 1D antiferromagnet with the continuous symmetry of the spin interactions. Fine-tuning to this unique value is extremely unlikely to occur in quasi-1D antiferromagnets, therefore the spin polaron is the stable quasiparticle of realistic 1D materials. Our results lead to a new interpretation of the ARPES spectra of quasi-1D antiferromagnets in the spin polaron language. Comment: 26 pages, 13 figures; revised version resubmitted to SciPost in June 2024 (Sec. 5 and App. C added) |
| Databáze: | arXiv |
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