Investigation of the effects of the graphene-substrate hybridization on the optical conductivity of graphene

Muhammad Aziz Majidi, Wileam Yonatan Phan, Andrivo Rusydi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Graphene is an emerging two-dimensional material with a lot of promising applications as devices, in which it must be combined with other materials, most notably put on top of a substrate. Recent research has shown that certain substrates can change the physical properties of graphene dramatically. Here, we propose a simple model describing a system of single layer graphene on top of a layered insulating substrate based on the tight-binding approximation, where we introduce a hybridization term of the graphene 2pz orbital and topmost substrate layer orbitals. We then calculate the density of states DOS (ν) and the real part of the optical conductivity tensor σ1 ab(ω) of the graphene layer for various values of the substrate band gap. The results show that the graphene-substrate hybridization tends to create states around the Fermi energy, thus enhancing the DC conductivity of the graphene layer. Furthermore, the peak in the σ1 aa(ω) of graphene tends to get renormalized and experience a redshift, most prominently when the substrate band gap matches twice the graphene nearest-neighbor hopping parameter tg. Meanwhile, an insulating substrate with a very high band gap (around 4tg) weakens the effects of the hybridization.

Original languageEnglish
Title of host publicationInternational Symposium on Current Progress in Mathematics and Sciences 2015, ISCPMS 2015
Subtitle of host publicationProceedings of the 1st International Symposium on Current Progress in Mathematics and Sciences
EditorsTerry Mart, Djoko Triyono
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413764
DOIs
Publication statusPublished - 19 Apr 2016
Event1st International Symposium on Current Progress in Mathematics and Sciences, ISCPMS 2015 - Depok, Indonesia
Duration: 3 Nov 20154 Nov 2015

Publication series

NameAIP Conference Proceedings
Volume1729
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference1st International Symposium on Current Progress in Mathematics and Sciences, ISCPMS 2015
Country/TerritoryIndonesia
CityDepok
Period3/11/154/11/15

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