Spin-aligned butterfly spectral map in Non-Hermitian quasicrystals

Soumya Ranjan Padhi; Souvik Roy; Debashree Chowdhury; Tapan Mishra

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arXiv · 2601.04986

Spin-aligned butterfly spectral map in Non-Hermitian quasicrystals

Soumya Ranjan Padhi·Souvik Roy·Debashree Chowdhury·Tapan Mishra

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Abstract

The Non-Hermitian spinful Aubry-Andr\'e-Harper (AAH) model in the presence of Rashba-type spin-orbit coupling (RSOC) and a spatially varying textured magnetic field is studied. Interestingly, our analysis produces a butterfly spectral map due to the non-trivial extent of localization of the states in the spectrum. This spectral map also exhibits an asymmetric spin alignment with respect to the wings of the butterfly. Our analysis also suggests that the onset of such a spectral map is a combined effect of the non-hermiticity, spin-orbit interaction, and the textured magnetic field.

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Soumya Ranjan Padhi, Souvik Roy, Debashree Chowdhury, Tapan Mishra. 2026-01-08. Spin-aligned butterfly spectral map in Non-Hermitian quasicrystals. https://arxiv.org/abs/2601.04986

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