Flux-driven charge and spin transport in a dimerized Hubbard ring with Fibonacci modulation

Souvik Roy; Soumya Ranjan Padhi; Tapan Mishra

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arXiv · 2509.09542

Flux-driven charge and spin transport in a dimerized Hubbard ring with Fibonacci modulation

Souvik Roy·Soumya Ranjan Padhi·Tapan Mishra

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Abstract

We study quantum transport in a one-dimensional Hubbard ring with dimerized nearest-neighbor hoppings and a Fibonacci-modulated onsite potential. For non-interacting case our analysis reveals that at half-filling, the charge current along with the Drude weight decreases with increasing onsite potential when inter-cell hopping dominates over the intra-cell hopping, while for dominating intra-cell hopping it shows non-monotonic behavior with sharp peak at certain critical modulation strength, indicating enhanced transport. Moving away from half-filling gives rise to re-entrant features in both quantities at fillings associated with Fibonacci numbers. On the other hand, in spin-imbalanced systems, both spin and charge current shows multiple peaks and re-entrant behavior, tunable via hopping dimerization and filling. Including the on-site Hubbard interaction preserves the re-entrant behavior in current and moreover favors finite transport which is absent in the non-interacting ring. These results reveal rich interplay among Fibonacci modulated potential, electron fillings, hopping dimerization and interaction.

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Souvik Roy, Soumya Ranjan Padhi, Tapan Mishra. 2025-09-11. Flux-driven charge and spin transport in a dimerized Hubbard ring with Fibonacci modulation. https://arxiv.org/abs/2509.09542

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