期刊
PHYSICAL REVIEW B
卷 95, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.035125
关键词
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资金
- MATRENA Doctoral Programme
- Academy of Finland [1260204]
- Energies Durables Research Grant from Ecole Polytechnique
- Ecole Polytechnique Foundation
- EDF Foundation
- Marie Curie FP7 Integration Grant within European Union
- European Union [660695]
- GENCI [544]
- Marie Curie Actions (MSCA) [660695] Funding Source: Marie Curie Actions (MSCA)
We present a general picture of the exciton properties of layered materials in terms of the excitations of their single-layer building blocks. To this end, we derive a model excitonic Hamiltonian by drawing an analogy with molecular crystals, which are other prototypical van der Waals materials. We employ this simplified model to analyze in detail the excitation spectrum of hexagonal boron nitride (hBN) that we have obtained from the ab initio solution of the many-body Bethe-Salpeter equation as a function of momentum. In this way, we identify the character of the lowest-energy excitons in hBN, discuss the effects of the interlayer hopping and the electron-hole exchange interaction on the exciton dispersion, and illustrate the relation between exciton and plasmon excitations in layered materials.
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