Absorption and optical selection rules of tunable excitons in biased bilayer graphene

J. C.G. Henriques, Itai Epstein, N. M.R. Peres

Research output: Contribution to journalArticlepeer-review


Biased bilayer graphene, with its easily tunable band gap, presents itself as the ideal system to explore the excitonic effect in graphene-based systems. In this paper we study the excitonic optical response of such a system by combining a tight-binding model with the solution of the Bethe-Salpeter equation, the latter being solved in a semianalytical manner, requiring a single numerical quadrature, thus allowing for a transparent calculation. With our approach we start by analytically obtaining the optical selection rules, followed by the computation of the absorption spectrum for the case of a biased bilayer encapsulated in hexagonal boron nitride, a system which has been the subject of a recent experimental study. Excellent agreement is seen when we compare our theoretical prediction with the experimental data.

Original languageEnglish
Article number045411
JournalPhysical Review B
Issue number4
StatePublished - 15 Jan 2022


Dive into the research topics of 'Absorption and optical selection rules of tunable excitons in biased bilayer graphene'. Together they form a unique fingerprint.

Cite this