title: Dielectric screening of excitons in monolayer graphene.
abstract: Excitonic transitions in graphene monolayers embedded in different dielectric environments have been investigated using combined absorption and transmission spectroscopy techniques. To vary the dielectric environment, graphene monolayer has been exfoliated in liquid medium. It has been shown that exciton binding energy decreases with increase in the dielectric constant of exfoliating solvents due to the screening of electron-electron and electron-hole interactions in graphene. The typical line shape of the excitonic peak in the absorption spectra is explained by the Fano resonance between the excitonic state and band continuum. Further it has been shown that, there exists a scaling relationship between the dielectric constant of the liquid and the exciton binding energy.
authors.affiliation: Electronic Materials and Device Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India. subhasis@jnu.ac.in.
authors.forename: Premlata
authors.initials: P
authors.lastname: Yadav
authors.affiliation: Electronic Materials and Device Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India. subhasis@jnu.ac.in.
authors.forename: Pawan Kumar
authors.initials: PK
authors.lastname: Srivastava
authors.affiliation: Electronic Materials and Device Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India. subhasis@jnu.ac.in.
authors.forename: Subhasis
authors.initials: S
authors.lastname: Ghosh