58 citations · 372 across the 26 of their papers we have counts for
26 papers
Chiral states induced by symmetry-breaking in lattices: Magnetic field effect
J. P. G. Nascimento, J. M. Pereira, R. N. Costa Filho +4
The sublattice-symmetry breaking in the lattice leads to a bandgap opening. A defect line in the substrate on which the lattice is deposited can be viewed as a topo…
Energy levels and Aharonov-Bohm oscillations in twisted bilayer graphene quantum dots and rings
N. S. Bandeira, Andrey Chaves, L. V. de Castro +4
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 confineme…
Valley-selective confinement of excitons in transition metal dichalcogenides with inhomogeneous magnetic fields
A. J. Chaves, D. R. da Costa, F. M. Peeters +1
Magnetized ferromagnetic disks or wires support strong inhomogeneous fields in their borders. Such magnetic fields create an effective potential, due to Zeeman and diamagnetic cont…
Moiré excitons in biased twisted bilayer graphene under pressure
V. G. M. Duarte, D. R. da Costa, N. M. R. Peres +2
Using the tight-binding model, we report a gap opening in the energy spectrum of the twisted bilayer graphene under the application of pressure, that can be further amplified by th…
Tunable properties of excitons in double monolayer semiconductor heterostructures
Luiz G. M. Tenório, Teldo A. S. Pereira, K. Mohseni +4
We studied the exciton properties in double layers of transition metal dichalcogenides (TMDs) with a dielectric spacer between the layers. We developed a method based on an expansi…
Magnetism in twisted triangular bilayer graphene quantum dots
M. Mirzakhani, H. C. Park, F. M. Peeters +1
Using a tight-binding model along with the mean-field Hubbard method, we investigate the effect of twisting angle on the magnetic properties of twisted bilayer graphene (tBLG) quan…
Trion clustering structure and binding energy in 2D semiconductor materials: Faddeev equations approach
K. Mohseni, M. R. Hadizadeh, T. Frederico +2
In this work, we develop the basic formalism to study trions in semiconductor layered materials using the Faddeev equations in momentum space for three different particles lying in…
Three-boson stability for boosted interactions towards the zero-range limit
K. Mohseni, A. J. Chaves, D. R. da Costa +2
We study the three-boson bound-state mass and wave functions for ground and excited states within the three-body relativistic framework with Kamada and Glöcke boosted potentials in…
Double Resonant Tunable Second Harmonic Generation in Two-dimensional Layered Materials through Band Nesting
Sudipta Romen Biswas, Jin Yu, Zhenwei Wang +4
We proposed a mechanism to generate giant anisotropic second harmonic nonlinear response via double resonance effect, achieved through band nesting via electronic bandstructure eng…
Zitterbewegung of moiré excitons in twisted MoS/WSe hetero-bilayers
I. R. Lavor, D. R. da Costa, L. Covaci +3
The moiré pattern observed in stacked non-commensurate crystal lattices, such as hetero-bilayers of transition metal dichalcogenides, produces a periodic modulation of their bandga…
Isolated and hybrid bilayer graphene rings
M. Mirzakhani, D. R. da Costa, F. M. Peeters
Using the continuum model, we investigate the electronic properties of two types of bilayer graphene (BLG) quantum ring (QR) geometries: (i) an isolated BLG QR and (ii) a monolayer…
Signatures of sub-band excitons in few-layer black phosphorus
A. Chaves, G. O. Sousa, K. Khaliji +3
Recent experimental measurements of light absorption in few-layer black phosphorus (BP) reveal a series of high and sharp peaks, interspersed by pairs of lower and broader features…
Visualization and Manipulation of Bilayer Graphene Quantum Dots with Broken Rotational Symmetry and Nontrivial Topology
Zhehao Ge, Frederic Joucken, Eberth Quezada +8
Electrostatically defined quantum dots (QDs) in Bernal stacked bilayer graphene (BLG) are a promising quantum information platform because of their long spin decoherence times, hig…
Electronic and transport properties of anisotropic semiconductor quantum wires
S. M. Cunha, D. R. da Costa, L. C. Felix +2
Within the effective-mass approximation, we theoretically investigated the electronic and transport properties of 2D semiconductor quantum wires (QWs) with anisotropic effective ma…
Two dimensional electron gas in a non-Euclidean space
R. N. Costa Filho, S. F. S. Oliveira, V. Aguiar
A charged particle in the presence of a magnetic field is studied in the position dependent operator formalism. Instead of a quantum harmonic oscillator, the solution of the result…
Current modulation in graphene p-n junctions with external fields
F. R. V. Araújo, D. R. da Costa, A. C. S. Nascimento +1
In this work we describe a proposal for a graphene-based nanostructure that modulates electric current even in the absence of a gap in the band structure. The device consists of a…
Electronic properties of bilayer graphene catenoid bridge
J. E. G. Silva, J. Saraiva, T. M. Santhiago +2
We study the properties of an electron on a catenoid surface. The catenoid is understood as a realization of a bridge connecting two graphene layer by a smooth surface. The curvatu…
Conditions for the occurrence of Coulomb blockade in phosphorene quantum dots at room temperature
H. A. Melo, M. A. Lino, D. R. da Costa +4
We study the addition energy spectra of phosphorene quantum dots focusing on the role of dot size, edges passivation, number of layers and dielectric constant of the substrate wher…
Localized surface plasmons in a continuous and flat graphene sheet
André J. Chaves, Diego R. Costa, Gil A. Farias +1
We derive an integral equation describing surface-plasmon polaritons in graphene deposited on a substrate with a planar surface and a dielectric protrusion in the opposite surface…
Excitonic gaps and exciton binding energies in multilayer phosphorene quantum dots
M. A. Lino, J. S. de Sousa, D. R. da Costa +3
Dielectric screening is greatly important to an accurate calculation of the exciton binding energies in two-dimensional materials. In this work, we calculate the dielectric functio…
Substrate effects on the exciton fine structure of black phosphorus quantum dots
J. S. de Sousa, M. A. Lino, D. R. da Costa +3
We study the size-dependent exciton fine structure in monolayer black phosphorus quantum dots (BPQDs) deposited on different substrates (isolated, Si and SiO) using a combinati…
Charging energy spectrum of black phosphorus quantum dots
M. A. Lino, J. S. de Sousa, D. R. da Costa +3
We present a theoretical study of the charging effects in single and double layer black phosphorus quantum dots (BPQDs) with lateral sizes of 2 nm and 3 nm. We demonstrate that the…
All-strain based valley filter in graphene nanoribbons using snake states
L. S. Cavalcante, A. Chaves, D. R. da Costa +2
A pseudo-magnetic field kink can be realized along a graphene nanoribbon using strain engineering. Electron transport along this kink is governed by snake states that are character…
Boundary conditions for phosphorene nanoribbons in the continuum approach
D. J. P. de Sousa, L. V. de Castro, D. R. da Costa +1
We investigate the energy spectrum of single layer black phosphorene nanoribbons (BPN) by means of a low-energy expansion of a recently proposed tight-binding model that describes…