# Surface Plasmon Polaritons in Planar Graphene Superlattices

## TL;DR

This paper investigates surface plasmon polaritons in graphene superlattices with periodic band gap modulation, revealing how their optical conductivity and spectra vary depending on the Fermi level position.

## Contribution

It introduces a detailed analysis of the optical conductivity and plasmon spectra in graphene superlattices considering different Fermi level scenarios.

## Key findings

- Optical conductivity varies significantly with Fermi level position.
- Surface plasmon polariton spectra differ depending on the Fermi level within minigaps or minibands.
- Interminiband contributions are crucial for understanding plasmon behavior.

## Abstract

Surface plasmon polaritons in planar graphene superlattices with one-dimensional periodic mo-dulation of the band gap were studied. The interminiband contribution to the optical conductivity of this system was found by the equation of motion method for two cases: the Fermi level falls within one of the minigaps and the Fermi level is located within one of the minibands. It was shown that the optical conductivity of the system varies significantly in these cases. The spectra of surface plasmon polaritons in the system differs for them.