Work

Effective medium model for graphene superlattices with electrostatic and magnetic vector potentials

Year: 2023

Type: article

Abstract: In this article we develop an effective medium model to characterize the electron wave propagation in graphene based nanostructures with electrostatic and magnetic vector potentials imposed on their surface. We use a numerical algorithm to determine the effective medium parameters of the heterostructure and calculate the electronic band structure of the system. We apply our formalism to analyze superlattices with solely a magnetic potential and reveal that the response of the structure remains reciprocal and is characterized by a decrease in the velocity of the charge carriers. We also study the response of superlattices with both potentials superimposed on graphene and show that the response of the system becomes nonreciprocal with a dispersion characterized by a tilted Dirac cone. We demonstrate that it is possible to alternate between type-I, type-II, or type-III Dirac cones by properly tuning the amplitude of the potentials.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.107.085119

Author: David E. Fernandes

Institutions: Instituto de Telecomunicações, University of Coimbra

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Simons Foundation, Instituto de Telecomunicações, Fundação para a Ciência e a Tecnologia

Awards: Propagação unidireccional e aprisonamento da luz com metamateriais, G3850789590, G4722547090, G8861565886