Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Pereira Jr., J M"'
We introduce a refined tight-binding (TB) model for Pt-based jacutingaite materials Pt$_{2}N$X$_{3}$, ($N$ = Zn, Cd, Hg; X = S, Se, Te), offering a detailed representation of the low-energy physics of its monolayers. This model incorporates all eleme
Externí odkaz:
http://arxiv.org/abs/2410.07522
Autor:
Uchôa, E. S., Lima, W. P., Sena, S. H. R., Chaves, A. J. C., Pereira Jr., J. M., da Costa, D. R.
We investigate the electronic properties of nanoribbons made out of monolayer Lieb, transition, and kagome lattices using the tight-binding model with a generic Hamiltonian. It allows us to map the evolutionary stages of the interconvertibility proce
Externí odkaz:
http://arxiv.org/abs/2408.15764
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 graphene p-n junction that acts as a Veselago lens that focuses ballis
Externí odkaz:
http://arxiv.org/abs/2006.02478
Autor:
Melo, H. A., Lino, M. A., da Costa, D. R., Chaves, A., Pereira Jr., J. M., Farias, G. A., de Sousa, J. S.
Publikováno v:
Phys. Rev. B 98, 115438 (2018)
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 where the dots are deposited. We show that for sufficiently low dielectric
Externí odkaz:
http://arxiv.org/abs/1806.05731
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 function and 2D polarizability of multilayer (up to three) phosphorene sheets
Externí odkaz:
http://arxiv.org/abs/1708.00512
Publikováno v:
J. Appl. Phys. 121, 024302 (2017)
We theoretically study a current switch that exploits the phase acquired by a charge carrier as it tunnels through a potential barrier in graphene. The system acts as an interferometer based on an armchair graphene quantum ring, where the phase diffe
Externí odkaz:
http://arxiv.org/abs/1702.00469
Publikováno v:
Phys. Rev. B 92, 125441 (2015)
We investigate the scattering of a wave packet describing low-energy electrons in graphene by a time-dependent finite step potential barrier. Our results demonstrate that, after Klein tunneling through the barrier, the electron acquires an extra ener
Externí odkaz:
http://arxiv.org/abs/1601.00536
Autor:
Pereira Jr., J. M., Katsnelson, M. I.
Publikováno v:
Phys. Rev. B 92, 075437 (2015)
In this work we introduce a low-energy Hamiltonian for single layer and bilayer black phosphorus that describes the electronic states at the vicinity of the gamma point. The model is based on a recently proposed tight-binding description for electron
Externí odkaz:
http://arxiv.org/abs/1504.02452
We investigate the magnetic interface states of graphene quantum dots that contain p-n junctions. Within a tight-binding approach, we consider rectangular quantum dots in the presence of a perpendicular magnetic field containing p-n, as well as p-n-p
Externí odkaz:
http://arxiv.org/abs/1301.3354
At the interface of electrostatic potential kink profiles one dimensional chiral states are found in bilayer graphene (BLG). Such structures can be created by applying an asymmetric potential to the upper and the lower layer of BLG. We found that: i)
Externí odkaz:
http://arxiv.org/abs/1109.2795