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Topological Phase Diagram of Generalized SSH Models with Interactions
Yuxiao Hang, Stephan Haas
https://arxiv.org/abs/2509.12373 https://arxiv.org/pdf/2509…

Topological Phase Diagram of Generalized SSH Models with Interactions
We investigate interacting Su-Schrieffer-Heeger (SSH) chains with two- and three-site unit cells using density matrix renormalization group (DMRG) simulations. By selecting appropriate filling fractions and sweeping across interaction strength \( J_z \) and dimerization \( δ\), we map out their phase diagrams and identify transition lines via entanglement entropy and magnetization measurements. In the two-site model, we observe the emergence of an interaction-induced antiferromagnetic intermed…