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arXiv · 2608.20560

Interband plasmons due to Mexican hat dispersion in two-dimensional materials with inverted bands

Vladimir A. Sablikov
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Abstract

Two-dimensional topological materials with Mexican-hat dispersion exhibit numerous nontrivial features, such as double-valued isoenergetic contours in k-space, strong mixing of electron and hole states, a van Hove singularity in the density of states, and specific quantum geometric properties. We find that, due to these features, Mexican-hat dispersion significantly strengthens interband plasmons, reduces their damping, and gives rise to an additional branch of the plasmon spectrum when electron-hole symmetry is broken. The plasmon spectra are limited to a finite range of the wave vector, the boundaries of which depend on the strength of the electron-electron interaction. We also reveal a relationship between the features of the plasmon spectrum and singularities of the joint density of states with a finite plasmon wave vector q, as well as features of the interband quantum metric, which also depend on q.

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Vladimir A. Sablikov. 2026-08-20. Interband plasmons due to Mexican hat dispersion in two-dimensional materials with inverted bands. https://doi.org/10.1016/j.physe.2026.116638

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