Size Quantization in Planar Graphene-Based Heterostructures: Pseudospin Splitting, Interface States, and Excitons

TL;DR

This paper investigates size quantization effects in graphene heterostructures, revealing pseudospin splitting, novel interface states, and exciton behavior, with analysis of external electric field influences.

Contribution

It introduces the concept of pseudospin splitting in size-quantized spectra and identifies new interface states arising from crossing dispersion curves.

Findings

Pseudospin splitting observed in size-quantized spectrum.

New interface states from crossing dispersion curves.

External electric field affects exciton spectrum.

Abstract

A planar quantum-well device made of a gapless graphene nanoribbon with edges in contact with gapped graphene sheets is examined. The size-quantization spectrum of charge carriers in an asymmetric quantum well is shown to exhibit a pseudospin splitting. Interface states of a new type arise from the crossing of dispersion curves of gapless and gapped graphene materials. The exciton spectrum is calculated for a planar graphene quantum well. The effect of an external electric field on the exciton spectrum is analyzed.