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Robustness of the universal optical transmittance in monolayer and multilayer graphene flakes under Coulomb interactions

Premlata Yadav, Pawan Kumar Srivastava, Nirat Ray, and Subhasis Ghosh
Phys. Rev. B 94, 121406(R) – Published 22 September 2016

Abstract

We present an experimental investigation on the universality of the optical transmittance of mono- and multilayer chemically exfoliated graphene flakes. By varying the exfoliating solvent, and thereby modulating the strength of electron-electron interactions, we find that the universality is not impacted over the visible region. The impact of modulating the interaction strength is clearly seen as shifts in the M-point exciton spectra. These shifts can then lead to a reduction in the wavelength regime over which universal wavelength independent optical transmittance is observed. At the level of first-order perturbation theory, our results are consistent with existing theoretical predictions for interaction corrections in optical properties of monolayer graphene.

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  • Received 31 March 2016
  • Revised 18 August 2016

DOI:https://doi.org/10.1103/PhysRevB.94.121406

©2016 American Physical Society

Authors & Affiliations

Premlata Yadav, Pawan Kumar Srivastava, Nirat Ray, and Subhasis Ghosh*

  • School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India

  • *subhasis.ghosh.jnu@gmail.com

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Issue

Vol. 94, Iss. 12 — 15 September 2016

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