Huge Trionic Effects in Graphene Nanoribbons

Thorsten Deilmann, Michael Rohlfing

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

One- and two-dimensional materials are being intensively investigated due to their interesting properties for next-generation optoelectronic devices. Among these, armchair-edged graphene nanoribbons are very promising candidates with optical properties that are dominated by excitons. In the presence of additional charges, trions (i.e., charged excitons) can occur in the optical spectrum. With our recently developed first-principle many-body approach (Phys. Rev. Lett. 116, 196804), we predict strongly bound trions in free-standing nanoribbons with large binding energies of 140-660 meV for widths of 14.6-3.6 Å. Both for the trions and for the excitons, we observe an almost linear dependency of their binding energies on the band gap. We observe several trion states with different character derived from the corresponding excitons. Because of the large bindings energies, this opens a route to applications by which optical properties are easily manipulated, for example, by electrical fields.
Original languageEnglish
JournalNano Letters
Volume17
Issue number11
Pages (from-to)6833-3837
Number of pages5
ISSN1530-6984
DOIs
Publication statusPublished - 2017

Keywords

  • 1D materials
  • Graphene nanoribbons
  • Excitons
  • Many-body perturbation theory
  • Optional spectra
  • Trions

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