Geometry and edge effects on the energy levels of graphene quantum rings: A comparison between tight-binding and simplified Dirac models

DR Da Costa, A Chaves, M Zarenia, JM Pereira Jr… - Physical Review B, 2014 - APS
We present a systematic study of the energy spectra of graphene quantum rings having
different geometries and edge types in the presence of a perpendicular magnetic field …

Valley filtering using electrostatic potentials in bilayer graphene

DR Da Costa, A Chaves, SHR Sena, GA Farias… - Physical Review B, 2015 - APS
Propagation of an electron wave packet through a quantum point contact (QPC) defined by
electrostatic gates in bilayer graphene is investigated. The gates provide a bias between the …

Analytic solution to pseudo-Landau levels in strongly bent graphene nanoribbons

T Liu, HZ Lu - Physical Review Research, 2022 - APS
Nonuniform elastic strain is known to induce pseudo-Landau levels in Dirac materials. But
these pseudo-Landau levels are hardly resolvable in an analytic fashion when the strain is …

Effect of zigzag and armchair edges on the electronic transport in single-layer and bilayer graphene nanoribbons with defects

A Orlof, J Ruseckas, IV Zozoulenko - Physical Review B—Condensed Matter …, 2013 - APS
We study electronic transport in monolayer and bilayer graphene with single and many short-
range defects focusing on the role of edge termination (zigzag versus armchair). Within the …

All-strain based valley filter in graphene nanoribbons using snake states

LS Cavalcante, A Chaves, DR Da Costa, GA Farias… - Physical Review B, 2016 - APS
A pseudomagnetic field kink can be realized along a graphene nanoribbon using strain
engineering. Electron transport along this kink is governed by snake states that are …

Valley Hall effect and nonlocal transport in strained graphene

XP Zhang, C Huang, MA Cazalilla - 2D Materials, 2017 - iopscience.iop.org
Graphene subject to high levels of shear strain leads to strong pseudo-magnetic fields
resulting in the emergence of pseudo-Landau levels. Here we show that, with modest levels …

Modulation of persistent current in graphene quantum rings

FRV Araújo, DR da Costa, AJC Chaves… - Journal of Physics …, 2022 - iopscience.iop.org
We investigate the effect of long-range impurity potentials on the persistent current of
graphene quantum rings in the presence of an uniform perpendicular magnetic field. The …

Frequency-tunable terahertz graphene laser enabled by pseudomagnetic fields in strain-engineered graphene

H Sun, Z Qi, Y Kim, M Luo, B Yang, D Nam - Optics Express, 2021 - opg.optica.org
Graphene-based optoelectronic devices have recently attracted much attention for the next-
generation electronic-photonic integrated circuits. However, it remains elusive whether it is …

Dirac fermions in graphene using the position-dependent translation operator formalism

V Aguiar, SM Cunha, DR da Costa, RNC Filho - Physical Review B, 2020 - APS
Within the position-dependent translation operator formalism for quantum systems, we
obtain analytical expressions for the eigenstates and the Landau level spectrum of Dirac …

Gate potential-controlled current switching in graphene Y-junctions

FRV Araújo, DR da Costa, FN Lima… - Journal of Physics …, 2021 - iopscience.iop.org
In this work we investigate the ballistic transport of electrons through three-terminal
graphene-based devices. The system consists of a Y-shaped junction formed by three …