10 papers
Finite-width altermagnetic quantum rings: angular-channel hybridization and Aharonov--Bohm physics
Edilberto O. Silva
We study a finite-width two-dimensional quantum ring with a quadratic -wave altermagnetic term, Tan--Inkson confinement, a perpendicular magnetic field, and independently tunabl…
Torsional selection rule for the spin--orbit conversion of light
Edilberto O. Silva
Standard Pancharatnam-Berry and linear-birefringent media convert optical spin into orbital angular momentum (OAM) through an anisotropy \emph{director}, a rank-two, headless field…
Geometry-Controlled Exceptional Points in Helicoidal Orbital-Angular-Momentum Photonics
Edilberto O. Silva
Exceptional points (EPs) are non-Hermitian spectral singularities where eigenvalues and eigenvectors coalesce. We propose a geometry-controlled route to EPs in orbital-angular-mome…
Thermodynamics and emergent thermomechanical response of a quantum ring with nonminimal spin--orbit coupling
João A. A. S. Reis, L. Lisboa-Santos, Edilberto O. Silva
We investigate the thermodynamic and emergent thermomechanical properties of fermions confined to a one-dimensional quantum ring with effective spin--orbit interactions induced by…
Torsion-induced confinement and tunable nonlinear optical gain in a mesoscopic electron system
Carlos Magno O. Pereira, Edilberto O Silva
We investigate the optical response of a conduction electron in a helically twisted mesoscopic medium containing a screw dislocation and a uniform torsional background, in the pres…
Thermodynamics and orbital structure of anti-de Sitter black holes in Palatini-inspired nonlinear electrodynamics
Edilberto O. Silva, João A. A. S. Reis, Faizuddin Ahmed
We construct a consistent anti-de Sitter completion of the static and spherically symmetric black-hole solution sourced by the Palatini-inspired nonlinear electrodynamics \(Y^n\) m…
Geometric Phases and Persistent Spin Currents from nonminimal couplings
Edilberto O. Silva, João A. A. S. Reis, L. Lisboa-Santos
We investigate a class of nonminimal derivative couplings between fermions and electromagnetic fields that generate Rashba-like spin--orbit interactions in one-dimensional quantum…
Structured-light propagation in a medium with uniform torsion: polarization textures, geometric birefringence, and beam-resolved optical activity
Edilberto O. Silva
We investigate finite-width optical-beam propagation in a medium with uniform torsion described by the geometric theory of a continuous distribution of screw dislocations. Starting…
Geometrical optical activity induced by a continuous distribution of screw dislocations
Humberto Belich, Edilberto O. Silva
We study light propagation in a medium with uniform torsion, modeled as a continuum of screw dislocations within the geometric theory of defects. By solving Maxwell's equations in…
Screw-dislocation-engineered quantum dot: geometry-tunable nonlinear optics, orbital qubit addressability, and torsion metrology
Edilberto O. Silva
We study a single electron confined in a uniform-torsion medium, a continuum model of a screw dislocation density, in a perpendicular magnetic field, and in the presence of an Ahar…