88 citations · 544 across the 23 of their papers we have counts for
23 papers
Charge-Spin Conversion in Two-Subband Quantum Wells with Conventional and Unconventional Rashba Spin-Orbit Coupling
Gerson J. Ferreira, Boyu Wang, Jiyong Fu +1
The reciprocal interconversion between spin polarization and charge current (CSC) is the focus of intensive theoretical and experimental investigation in spintronics research. Its…
DFT2kp: effective kp models from ab-initio data
João Victor V. Cassiano, Augusto L. Araújo, Paulo E. Faria Junior +1
The method, combined with group theory, is an efficient approach to obtain the low energy effective Hamiltonians of crystalline materials. Although the…
Engineering topological phases in triple HgTe/CdTe quantum wells
G. J. Ferreira, D. R. Candido, F. G. G. Hernandez +4
Quantum wells formed by layers of HgTe between HgCdTe barriers lead to two-dimensional (2D) topological insulators, as predicted by the BHZ model. Here, we theoreticall…
Spin drift-diffusion for two-subband quantum wells
I. R. de Assis, R. Raimondi, G. J. Ferreira
Controlling the spin dynamics and spin lifetimes is one of the main challenges in spintronics. To this end, the study of the spin diffusion in two-dimensional electron gases (2DEGs…
Fabry-Pérot resonant vortices and magnetoconductance in topological insulator constrictions with magnetic barriers
R. P. Maciel, A. L. Araújo, C. H. Lewenkopf +1
The edge states of two-dimensional time-reversal topological insulators support a perfect helical conductance on wide ribbons due to the absence of backscattering. Here, we study t…
Spin-orbit coupling in wurtzite quantum wells
J. Y. Fu, P. H. Penteado, D. R. Candido +4
Effective spin-orbit (SO) Hamiltonians for conduction electrons in wurtzite heterostructures are lacking in the literature, in contrast to zincblende structures. Here we address th…
High-degeneracy points protected by site-permutation symmetries
F. Crasto de Lima, G. J. Ferreira
Space group symmetries dictate the energy degeneracy of quasiparticles (e.g., electronic, photonic) in crystalline structures. For spinless systems, there can only be double or tri…
Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices
F. Crasto de Lima, Gerson J. Ferreira, R. H. Miwa
Materials with designed properties arises in a synergy between theoretical and experimental approaches. In this study we explore the set of Archimedean lattices forming a guidance…
Interplay between boundary conditions and Wilson's mass in Dirac-like Hamiltonians
A. L. Araújo, R. P. Maciel, R. G. F. Dornelas +2
Dirac-like Hamiltonians, linear in momentum , describe the low-energy physics of a large set of novel materials, including graphene, topological insulators, and Weyl fermions. W…
Zitterbewegung and bulk-edge Landau-Zener tunneling in topological insulators
Gerson J. Ferreira, Renan P. Maciel, Poliana H. Penteado +1
We investigate the ballistic zitterbewegung dynamics and the Landau-Zener tunneling between edge and bulk states of wave packets in two-dimensional topological insulators. In bulk,…
Quantum anomalous Hall effect in metal-bis(dithiolene), magnetic properties, doping and interfacing graphene
F. Crasto de Lima, G. J. Ferreira, R. H. Miwa
The realization of the Quantum anomalous Hall effect (QAHE) in two dimensional (2D) metal organic frameworks (MOFs), (MCS) with M = Mn, Fe, Co, Ru and Rh, has been inve…
Exact Exchange: a pathway for a Density Functional Theory of the Integer Quantum Hall Effect
D. Miravet, G. J. Ferreira, C. R. Proetto
It is shown here that the Exact Exchange (EE) formalism provides a natural and rigorous approach for a Density Functional Theory (DFT) of the Integer Quantum Hall Effect (IQHE). Ap…
Confinement and Fermion Doubling Problem in Dirac-like Hamiltonians
B. Messias de Resende, F. Crasto de Lima, R. H. Miwa +2
We investigate the interplay between confinement and the fermion doubling problem in Dirac-like Hamiltonians. Individually, both features are well known. First, simple electrostati…
Tuning the topological states in metal-organic bilayers
F. Crasto de Lima, Gerson J. Ferreira, R. H. Miwa
We have investigated the energetic stability and the electronic properties of metal-organic topological insulators bilayers (BLs), -BL, with M=Ni and Pt, using first-p…
Conductance and Kondo Interference beyond Proportional Coupling
Luis G. G. V. Dias da Silva, Caio H. Lewenkopf, Edson Vernek +2
The transport properties of nanostructured systems are deeply affected by the geometry of the effective connections to metallic leads. In this work we derive a conductance expressi…
Spin drift and diffusion in one- and two-subband helical systems
Gerson J. Ferreira, Felix G. G. Hernandez, Patrick Altmann +1
The theory of spin drift and diffusion in two-dimensional electron gases is developed in terms of a random walk model incorporating Rashba, linear and cubic Dresselhaus, and inters…
Topological Nonsymmorphic Ribbons out of Symmorphic Bulk
Augusto L. Araújo, Ernesto O. Wrasse, Gerson J. Ferreira +1
States of matter with nontrivial topology have been classified by their bulk symmetry properties. However, by cutting the topological insulator into ribbons, the symmetry of the sy…
Magnetically Defined Qubits on 3D Topological Insulators
Gerson J. Ferreira, Daniel Loss
We explore potentials that break time-reversal symmetry to confine the surface states of 3D topological insulators into quantum wires and quantum dots. A magnetic domain wall on a…
Helical States in Curved Bilayer Graphene
Jelena Klinovaja, Gerson J. Ferreira, Daniel Loss
We study spin effects of quantum wires formed in bilayer graphene by electrostatic confinement. With a proper choice of the confinement direction, we show that in the presence of m…
Low Bias Negative Differential Resistance in Graphene Nanoribbon Superlattices
Gerson J. Ferreira, Michael N. Leuenberger, Daniel Loss +1
We theoretically investigate negative differential resistance (NDR) for ballistic transport in semiconducting armchair graphene nanoribbon (aGNR) superlattices (5 to 20 barriers) a…
Collapse of ringlike structures in 2DEGs under tilted magnetic fields
Gerson J. Ferreira, J. Carlos Egues
In the quantum Hall regime, the longitudinal resistivity plotted as a density--magnetic-field () diagram displays ringlike structures due to the crossings of two…
Many-body effects on the ringlike structures in two-subband wells
Gerson J. Ferreira, Henrique J. P. Freire, J. Carlos Egues
The longitudinal resistivity of two-dimensional electron gases formed in wells with two subbands displays ringlike structures when plotted in a density--magnetic-field dia…
Ringlike structures in the density--magnetic-field diagram of two-subband quantum Hall systems
Gerson J. Ferreira, Henrique J. P. Freire, J. Carlos Egues
Motivated by recent experiments [Zhang \textit{et al.}, Phys. Rev. Lett. \textbf{95}, 216801 (2005) and Ellenberger \textit{et al.}, cond-mat/0602271] reporting novel ringlike stru…