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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.58: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster E
Exploring magnetic pairing mechanisms in the t-J model on mixed-dimensional ladder systems using high-order series expansion — •Jakob Heidweiler, Patrick Adelhardt, Paul Fadler, and Kai Phillip Schmidt — Friedrich-Alexander-Universität Erlangen-Nürnberg
For many years, the t-J model has been suggested as the basis upon which to discuss high-T superconducting systems. Over the last decades the t-J model has become a paradigmatic model to understand the physics of high-Tc superconductors in a minimal setting. Nevertheless, pinpointing the exact pairing mechanism in these systems has not been accomplished. In recent works on mixed-dimensional t-J ladders [1,2] a magnetic pairing mechanism between holes on opposite legs of the ladder has been suggested. Here we extend these investigations by applying perturbative continuous unitary transformations (pCUTs) about the isolated rung limit in the thermodynamic limit. We investigate the effective low-energy Hamiltonian with special attention towards the properties of the emergent bound states.
[1] H. Lange et al. arXiv:2309.13040
[2] H. Lange et al. arXiv:2309.15843
Keywords: t-J model; series expansion; Heisenberg ladder; bound states