Programme

P.31 -- Poster, VCTP-45

Date: Tuesday, 13 October 2020

Time: 08:30 - 10:00

Understanding the electronic band structures of single-layer and bilayer graphene nanoribbons: An intensive comparison

Nguyen Lam Thuy Duong (1), Tran Quynh Trang (2), Huynh Thi Bich Tuyen (2), Le Dang Khoa (2), Vu Thanh Tra (2)

(1) School of Graduate, Can Tho University, Can Tho, Viet Nam; (2) Department of Physics, School of Education, Can Tho University, Can Tho, Viet Nam

Aiming to provide an insightful and general comparison about the electronic band structures of the single-layer and bilayer graphene nanoribbons, three distinct structures including single-layer, the AA and AB stacking-bilayers in both armchair and zigzag edge orientations in the presence of external electric fields were investigated. Using the Tight-Binding calculations, we observed noticeable effects, for instance, the opening of the bandgap Eg strongly depends on the edge states and the magnitude of external electric fields. Furthermore, each type of electric field (vertical or transverse) affects differently the electronic gap of each structure. When comparing the effect of applying the electric field, the AB stacking bilayer structures exhibit more remarkably in the change in the band structure as well as the opening of the bandgap. Besides, the intriguing consequence is that there are the similarities between the variation of the band structure and Eg of mono-layer and the AA stacking bilayers because of the origin of the charge-density distribution. All of the change of the electronic band structure is reflected by the density of states (DOS) with the essential features. From the obtained results, we hope that these will provide a more comprehensive understanding of the electronic properties of single-layer and bilayer graphene, without and with electric fields, contributing to bringing these material structures into electronic applications in the future. Corresponding author: vttra@ctu.edu.vn

Presenter: Nguyen Lam Thuy Duong

Presentation file: