English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a general picture of the exciton properties of layered materialsin terms of the excitations of their single-layer building blocks. To this end,we derive a model excitonic hamiltonian by drawing an analogy with molecularcrystals, which are other prototypical van der Waals materials. We employ thissimplified model to analyse in detail the excitation spectrum of hexagonalboron nitride (hBN) that we have obtained from the {\it ab initio} solution ofthe many-body Bethe-Salpeter equation as a function of momentum. In this way weidentify the character of the lowest-energy excitons in hBN, discuss theeffects of the interlayer hopping and the electron-hole exchange interaction onthe exciton dispersion, and illustrate the relation between exciton and plasmonexcitations in layered materials.

Excitons in van der Waals materials: from monolayer to bulk hexagonal boron nitride