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 …

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 …

Gap opening in graphene nanoribbons by application of simple shear strain and in-plane electric field

NS Bandeira, DR Da Costa, A Chaves… - Journal of Physics …, 2020 - iopscience.iop.org
The effects of shear strain and applied in plane electric field on the electronic properties of
monolayer graphene nanoribbons (GNRs) are theoretically investigated. Band structures …

Valley filtering in graphene due to substrate-induced mass potential

DR Da Costa, A Chaves, GA Farias… - Journal of Physics …, 2017 - iopscience.iop.org
The interaction of monolayer graphene with specific substrates may break its sublattice
symmetry and results in unidirectional chiral states with opposite group velocities in the …

Quantum information of a relativistic particle with position-dependent mass under the Aharonov–Casher effect

ARP Moreira, PO Amadi, AN Ikot… - Canadian Journal of …, 2024 - cdnsciencepub.com
In this work, the influence of the Aharonov–Casher (AC) effect is investigated for a relativistic
particle with position-dependent mass through Shannon quantum information. Shannon's …

Energy levels and Aharonov-Bohm oscillations in twisted bilayer graphene quantum dots and rings

NS Bandeira, A Chaves, LV de Castro… - arxiv preprint arxiv …, 2024 - arxiv.org
We present a systematic study of the energy levels of twisted bilayer graphene (tBLG)
quantum dots (QD) and rings (QR) under an external perpendicular magnetic field. The …

Energy spectrum of a Dirac particle with position-dependent mass under the influence of the Aharonov-Casher effect

RRS Oliveira, VFS Borges, MF Sousa - Brazilian Journal of Physics, 2019 - Springer
In this paper, we investigate the influence of the Aharonov-Casher (AC) effect on the
relativistic and nonrelativistic energy spectra of a neutral Dirac particle with position …

Magnetic field induced vortices in graphene quantum dots

IR Lavor, DR Da Costa, A Chaves… - Journal of Physics …, 2020 - iopscience.iop.org
The energy spectrum and local current patterns in graphene quantum dots (QD) are
investigated for different geometries in the presence of an external perpendicular magnetic …

Massive Dirac fermions in one-dimensional inhomogeneous nanorings

ES Azarova, GM Maksimova, VA Burdov - Physica E: Low-dimensional …, 2019 - Elsevier
Within the framework of a one-dimensional model, we calculate electronic spectra and
persistent currents of imperfect (containing one or several defects) nanoscale Aharonov …

Theoretical proposals of graphene-based electronic devices

FRV Araújo - 2021 - repositorio.ufc.br
Graphene has been extensively investigated after its isolation in 2004 by AK Geim and KS
Novoselov. Due to its remarkable electronic and transport properties, it has become a …