Microscopic theory for the groundstate and linear optical response of novel two-dimensionalmaterials with hexagonal symmetry

Tineke Stroucken, Stephan W Koch

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Scopus citations

Abstract

This chapter summarizes recent theoretical work to determine the groundstate and the linear optical properties of quasi-two-dimensional materials with hexagonal lattice symmetry. The main ingredients of the fully relativistic tight-binding model analysis for graphene and transition metal dichalcogenites are summarized. Dirac-Bloch equations are derived and solved in the regimes of weak and strong Coulomb coupling. Whereas single-layer graphene always seems to be in the weak Coulomb-coupling regime, realistic parameter analysis of WSe2 and WS2 identifies these materials to be in the regime of strong Coulomb coupling. Consequently, they are predicted to exhibit an excitonic insulator groundstate with optically active p-excitons. On this basis, a unified understanding and excellent agreement of the theoretical predictions with a large variety of systematic experiments is obtained.

Original languageEnglish (US)
Title of host publicationOptical Properties of Graphene
PublisherWorld Scientific Publishing Co. Pte. Ltd.
Pages43-84
Number of pages42
ISBN (Electronic)9789813148758
ISBN (Print)9789813148741
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Materials Science(all)

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