Transmission across a bilayer graphene region

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Olyaei, HZ (Author) Other; Ribeiro, P (Author) Other; Eduardo V Castro (Author) FCUP

Journal

Title: Physical Review B

Vol. 99

ISSN: 2469-9950

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 5 Citations

Other information

Authenticus ID: P-00Q-MX7

DOI: 10.1103/physrevb.99.205436

Abstract (EN): The transmission across a graphene bilayer region is calculated for two different types of connections to monolayer leads. A transfer-matrix algorithm based on a tight-binding model is developed to obtain the ballistic transmission beyond linear response. The two configurations are found to behave similarly when no gate voltage is applied. For a finite gate voltage, both develop a conductance gap characteristic of a biased bilayer, but only one shows a pronounced conductance step at the gap edge. A gate voltage domain wall applied to the bilayer region renders the conductance of the two configurations similar For a microstructure consisting of equally spaced domain walls, we find a high sensitivity to the domain size. This is attributed to the presence of topologically protected in-gap states localized at domain walls, which hybridize as the domain size becomes of the order of their confining scale. Our results show that transmission through a bilayer region can be manipulated by a gate voltage in ways not previously anticipated.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9