Interlayer excitons in transition-metal dichalcogenide heterostructures with type-II band alignment

L. Meckbach, U. Huttner, L. C. Bannow, T. Stroucken, Stephan W Koch

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Combining ab initio density functional theory with the Dirac-Bloch and gap equations, excitonic properties of transition-metal dichalcogenide hetero-bilayers with type-II band alignment are computed. The existence of interlayer excitons is predicted, whose binding energies are as large as 350 meV, only roughly 100 meV less than those of the coexisting intralayer excitons. The oscillator strength of the interlayer excitons reaches a few percent of the intralayer exciton resonances and their radiative lifetime is two orders of magnitude larger than that of the intralayer excitons.

Original languageEnglish (US)
Article number374002
JournalJournal of Physics Condensed Matter
Volume30
Issue number37
DOIs
StatePublished - Aug 24 2018
Externally publishedYes

Fingerprint

Excitons
Transition metals
Heterojunctions
interlayers
transition metals
alignment
excitons
radiative lifetime
Binding energy
oscillator strengths
Density functional theory
binding energy
LDS 751
density functional theory

Keywords

  • interlayer excitons
  • TMDCs
  • van-der-Waals heterostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Interlayer excitons in transition-metal dichalcogenide heterostructures with type-II band alignment. / Meckbach, L.; Huttner, U.; Bannow, L. C.; Stroucken, T.; Koch, Stephan W.

In: Journal of Physics Condensed Matter, Vol. 30, No. 37, 374002, 24.08.2018.

Research output: Contribution to journalArticle

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AU - Huttner, U.

AU - Bannow, L. C.

AU - Stroucken, T.

AU - Koch, Stephan W

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AB - Combining ab initio density functional theory with the Dirac-Bloch and gap equations, excitonic properties of transition-metal dichalcogenide hetero-bilayers with type-II band alignment are computed. The existence of interlayer excitons is predicted, whose binding energies are as large as 350 meV, only roughly 100 meV less than those of the coexisting intralayer excitons. The oscillator strength of the interlayer excitons reaches a few percent of the intralayer exciton resonances and their radiative lifetime is two orders of magnitude larger than that of the intralayer excitons.

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