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

Abstract

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 semi-analytical 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. An excellent agreement is seen when we compare our theoretical prediction with the experimental data.

5 fugues, one comparing experimental data and theory

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• Gate-induced insulating state in bilayer graphene devices
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• Efficient $\mathcal{O}(N^2)$ approach to solve the Bethe-Salpeter equation for excitonic bound states
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• Nonlinear optical selection rules of excitons in monolayer transition metal dichalcogenides
• Analytical description of the 1s exciton linewidth temperature-dependence in transition metal dichalcogenides

Cited by in corpus (16)

• Theoretical methods for excitonic physics in two-dimensional materials
• Electrically Tunable Interband Collective Excitations in Biased Bilayer and Trilayer Graphene
• Tunable Excitons in Rhombohedral Trilayer Graphene
• Moiré excitons in biased twisted bilayer graphene under pressure
• Anisotropic linear and non-linear excitonic optical properties of buckled monolayer semiconductors
• Dynamical screening and excitonic bound states in biased bilayer graphene
• Electrically Tunable Fine Structure of Negatively Charged Excitons in Gated Bilayer Graphene Quantum Dots
• Tunable nonlinear excitonic optical response in biased bilayer graphene
• Optical Properties of Gated Bilayer Graphene Quantum Dots with Trigonal Warping
• Tunable exciton polaritons in band-gap engineered hexagonal boron nitride
• Tunable exciton polaritons in biased bilayer graphene
• Strongly Coupled Exciton--Hyperbolic-phonon-polariton Hybridized States in hBN-encapsulated Biased Bilayer Graphene
• The Transmission Line Model for 2D Materials and van der Waals Heterostructures
• Cavity-Driven Attractive Interactions in Quantum Materials
• Excitonic optical absorption in strained monolayer CrSBr
• Excitonic instability in transition metal dichalcogenides