Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Charge Order
TT 54.10: Talk
Friday, March 21, 2025, 12:00–12:15, H33
Kinetic Magnetism and Stripe Order in the Antiferromagnetic Bosonic t-J Model — •Timothy J. Harris1,2, Ulrich Schollwöck1,2, Annabelle Bohrdt1,2,3, and Fabian Grusdt1,2 — 1Ludwig Maximilian University of Munich, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3University of Regensburg, Regensburg, Germany
Understanding the microscopic mechanisms governing the physics of doped quantum magnets is a central challenge in strongly correlated many-body physics. In this talk, I will present results that disentangle the role of particle statistics from the intrinsic physics of strong correlations in the antiferromagnetic (AFM) bosonic t-J model. Using large-scale density matrix renormalization group (DMRG) calculations, we map out the T=0 phase diagram on the 2D square lattice [1]. At low doping, we find evidence of partially-filled stripe structures, reminiscent of those observed in high-Tc cuprates. As doping increases, a transition occurs to a partially-polarized ferromagnetic (FM) phase, driven by formation of Nagaoka polarons as mobile holes bind to localized FM regions. At high doping or large t/J, these polarons overlap, and the system evolves into a full-polarized ferromagnet. Our findings shed new light on the role of particle statistics in strongly correlated quantum matter, revealing connections to stripe formation and the physics of kinetic ferromagnetism. I will also discuss experimental realizations of this model using state-of-the-art quantum simulators, paving the way for future studies of doped bosonic quantum magnets.
[1] T.J. Harris et al., arXiv:2410.00904 (2024).
Keywords: Quantum simulation; Bosonic t-J model; Doped quantum magnets; Nagaoka ferromagnetism; Stripe formation