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Effects of Edge Magnetism and External Electric Field on Energy Gaps in Multilayer Graphene Nanoribbons

Published

Author(s)

Bhagawan Sahu, Hongki Min, Sanjay K. Banerjee

Abstract

Using a first principles density functional theory, we study electronic structure of multilayer graphene nanoribbons as a function of the ribbon widths and an external electric fields. We consider two types of edges (armchair and zigzag) and each with two edge alignments (referred to as alpha- and beta- alignments). We show that multilayer armchair nanoribbons exhibit three classes of energy gaps which decrease with increasing widths, similarly as in monolayer and bilayer armchair nanoribbons. Non-magnetic multilayer zigzag nanoribbons have band structures that are sensitive to the edge alignments and the number of layers, indicating different magnetic properties and resulting energy gaps. We find that energy gaps can be induced in ABC-stacked ribbons with an external electric field, while in other stacking sequences, the gaps decrease or remain closed as an external electric field increases.
Citation
Physical Review B
Volume
82
Issue
11

Keywords

graphene, electronic structure

Citation

Sahu, B. , Min, H. and Banerjee, S. (2010), Effects of Edge Magnetism and External Electric Field on Energy Gaps in Multilayer Graphene Nanoribbons, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905912 (Accessed May 22, 2024)

Issues

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Created September 13, 2010, Updated October 12, 2021