Programme

O.11 -- Oral, VCTP-47

Date: Monday, 1 August 2022

Time: 15:05 - 15:30

Bilayer armchair graphene nanoribbons under the effect of combining vacancy and external electric fields

Nguyen Thi Kim Quyen (1,2), Pham Tu Huynh (1) and Vu Thanh Tra (3)

(1) School of Graduate, Can Tho University, CanTho, Vietnam (2) Faculty of Engineering and Technology, Kien Giang University, KienGiang, Vietnam (3) Department of Physics, School of Education, Can Tho University, CanTho, Vietnam

In this work, we aim to investigate the electronic structure of bilayer armchair graphene nanoribbons (BL-AGNRs) under the simultaneous effects of vacancies and external fields by using Tight Binding (TB) calculations. The variation of the electronic properties due to the number and the position of vacancies is investigated extensively. The results illustrate that the band gaps of BL-AGNRs can be modified by the two factors above. Due to the missing of a single C atom, the energy gap was divided into two almost symmetrical gaps around the Fermi level. Besides, the gap in groups 3p and 3p+1 are narrowed, whereas the opposite trend is true for class 3p+2. Moreover, the various mono-vacancy positions cause the different DOS peaks in energy bands. On the other hand, under the impact of external electric fields, the bandgap and the band shape are strongly modulated. This confirms the energy gap strongly depends on the type and the magnitude of electric fields. This work thus unveils some important conditions for controlling the gap as well as the electronic properties of BL-AGNRs.

Presenter: Nguyen Thi Kim Quyen