Faculty Publications

Title

Modification of electronic band structure in mL + nL (m = 1, 2; N = 1-5) free-stacking graphene

Document Type

Article

Journal/Book/Conference Title

Applied Physics Letters

Volume

109

Issue

15

Abstract

In this paper, we studied stacked mL + nL graphene layers using Raman scattering spectroscopy. Our results indicate that the 2D band from stacked graphene can be considered as a superposition of those from the constituent nL and mL graphene layers, and a blueshift in the 2D band is observed when n or m = 1. The blueshift increases with the number of stacked layers and can be well understood by the reduction of Fermi velocity in the single layer graphene, as studied in the 1L + 1L (or twisted bilayer) case. As the number of stacked layers changes from 1 to 5, the Fermi velocity in the single layer graphene reduces to about 85% of its initial value. This study shows a convenient way to realize the modification of the Fermi velocity in free-stacking graphene and is of significance to the applications of graphene-based heterostructures.

Original Publication Date

10-10-2016

DOI of published version

10.1063/1.4964706

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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