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Title: Dielectric function and plasmons in graphene: A self-consistent-field calculation within a Markovian master equation formalism

Journal Article · · Physical Review B
 [1];  [1];  [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)

We introduce a method for calculating the dielectric function of nanostructures with an arbitrary band dispersion and Bloch wave functions. The linear response of a dissipative electronic system to an external electromagnetic field is calculated by a self-consistent-field approach within a Markovian master equation formalism (SCF-MMEF) coupled with full-wave electromagnetic equations. The SCF-MMEF accurately accounts for several concurrent scattering mechanisms. The method captures interband electron-hole-pair generation, as well as the interband and intraband electron scattering with phonons and impurities. We employ the SCF-MMEF to calculate the dielectric function, complex conductivity, and loss function for supported graphene. From the loss-function maximum, we obtain plasmon dispersion and propagation length for different substrate types [nonpolar diamondlike carbon (DLC) and polar SiO2 and hBN], impurity densities, carrier densities, and temperatures. Plasmons on the two polar substrates are suppressed below the highest surface phonon energy, while the spectrum is broad on the nonpolar DLC. Plasmon propagation lengths are comparable on polar and nonpolar substrates and are on the order of tens of nanometers, considerably shorter than previously reported. As a result, they improve with fewer impurities, at lower temperatures, and at higher carrier densities.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
University of Wisconsin-Madison
Grant/Contract Number:
SC0008712
OSTI ID:
1434260
Alternate ID(s):
OSTI ID: 1253024
Journal Information:
Physical Review B, Vol. 93, Issue 20; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (4)

Controlling plasmon modes and damping in buckled two-dimensional material open systems journal February 2017
Density matrix superoperator for periodic quantum systems and its application to quantum cascade laser structures journal September 2019
Dielectric waveguides with embedded graphene nanoribbons for all-optical broadband modulation journal January 2019
Controlling plasmon modes and damping in buckled two-dimensional material open systems text January 2017

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