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Energy levels of triangular and hexagonal graphene quantum dots: a comparative study between the tight-binding and the Dirac approach
M. Zarenia, A. Chaves, G. A. Farias +1
The Dirac equation is solved for triangular and hexagonal graphene quantum dots for different boundary conditions in the presence of a perpendicular magnetic field. We analyze the…
Enhanced Optical Dichroism of Graphene Nanoribbons
F. Hipolito, A. J. Chaves, R. M. Ribeiro +3
The optical conductivity of graphene nanoribbons is analytical and exactly derived. It is shown that the absence of translation invariance along the transverse direction allows con…
Conditions for non-monotonic vortex interaction in two-band superconductors
A. Chaves, L. Komendová, M. V. Milošević +3
We describe a semi-analytic approach to the two-band Ginzburg-Landau theory, which predicts the behavior of vortices in two-band superconductors. We show that the character of the…
Wave packet dynamics and valley filter in strained graphene
Andrey Chaves, L. Covaci, Kh. Yu. Rakhimov +2
The time evolution of a wavepacket in strained graphene is studied within the tight-binding model and continuum model. The effect of an external magnetic field, as well as a strain…
Grading effects in semiconductor nanowires with longitudinal heterostructures
Andrey Chaves, J. A. K. Freire, G. A. Farias
The role of graded interfaces between materials in a cylindrical free-standing quantum wire with longitudinal heterostructures is theoretically investigated, by solving the Schrödi…