Effects of screening on the optical absorption in graphene and in metallic monolayers

Marinko Jablan, Marin Soljačić, and Hrvoje Buljan
Phys. Rev. B 89, 085415 – Published 18 February 2014

Abstract

Screening is one of the fundamental concepts in solid-state physics. It has a great impact on the electronic properties of graphene, where huge mobilities were observed in spite of the large concentration of charged impurities. While static screening has successfully explained dc mobilities, screening properties can be significantly changed at infrared or optical frequencies. In this paper, we discuss the influence of dynamical screening on the optical absorption of graphene and other two-dimensional electron systems such as metallic monolayers. This research is motivated by recent experimental results that pointed out that graphene plasmon linewidths and optical scattering rates can be much larger than scattering rates determined by dc mobilities. Specifically, we discuss a process in which a photon incident on a graphene plane can excite a plasmon by scattering from an impurity, or a surface optical phonon of the substrate.

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  • Received 23 October 2013
  • Revised 13 January 2014

DOI:https://doi.org/10.1103/PhysRevB.89.085415

©2014 American Physical Society

Authors & Affiliations

Marinko Jablan1,*, Marin Soljačić2,†, and Hrvoje Buljan1,‡

  • 1Department of Physics, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
  • 2Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

  • *mjablan@phy.hr
  • soljacic@mit.edu
  • hbuljan@phy.hr

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Issue

Vol. 89, Iss. 8 — 15 February 2014

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