3 papers
math-ph2026
Exact versus tight-binding models in longitudinally modulated -symmetric coupled waveguides
Alonso Contreras-Astorga, José Israel Galindo-RodrÃguez
The tight-binding (TB) model is a widely adopted approximation scheme for describing light propagation in waveguide arrays. Despite its success, its validity in -symm…
cond-mat.mes-hall2026
Super-Klein tunneling in 2D Lorentzian-type barriers in graphene
Alonso Contreras-Astorga, Francisco Correa, Luis Inzunza +2
We introduce a two-dimensional model of spin-1/2 Dirac fermions in graphene subjected to a highly tunable electric field, which exhibits super-Klein tunneling. The electric field c…
physics.bio-ph2025
Low-Energy DNA Bubble Dynamics via the Quantum Coulomb Potential
Juan D. GarcÃa-Muñoz, A. Contreras-Astorga, L. M. Nieto
We developed a low-energy model that can be used at any time to describe the dynamics of DNA bubbles at temperatures below the melting point. The Schrödinger equation associated w…