Work

Designer gapped and tilted Dirac cones in lateral graphene superlattices

Year: 2025

Type: article

Abstract: We show that a planar array of bipolar waveguides in graphene can be used to engineer gapped and tilted two-dimensional Dirac cones within the electronic band structure. The presence of these gapped and tilted Dirac cones is demonstrated through a superlattice tight-binding model and verified using a transfer matrix calculation. By varying the applied gate voltages, the tilt parameter of these Dirac cones can be controlled, and their gaps can be tuned to fall in the terahertz range. The possibility of gate-tunable gapped Dirac cones gives rise to terahertz applications via interband transitions and designer Landau level spectra, both of which can be controlled via Dirac cone engineering. We anticipate that our paper will encourage Dirac cone tilt and gap engineering for gate-tunable device applications in lateral graphene superlattices.

Source: APL Quantum

DOI: 10.1063/5.0251887

Authors: A. Wild, R. R. Hartmann, E. Mariani, M. E. Portnoi

Institutions: University of Exeter, De La Salle University

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funders: Horizon 2020 Framework Programme, Engineering and Physical Sciences Research Council