Título
AB-INITIO CALCULATION OF TWO-PHOTON ABSORPTION FOR SEMICONDUCTORS
Autor
ALAN BERNAL
Colaborador
Bernardo Mendoza (Asesor de tesis)
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
"A theoretical derivation of two-photon absorption (2PA) from bulk, surface and 2 dimensional (2D) semiconductors, based on the length gauge analysis and the electron density operator, is formulated; the intraband r_i part and the interband r_e part of the position operator r are properly accounted for. Within the independent particle approximation, the nonlinear third order susceptibility tensor χ abcd (−ω; −ω, −ω, ω) and the two-photon absorption coefficient are calculated, including the scissors correction needed to correct the well-known underestimation of the local-density-approximation band gap. Using time-reversal symmetry, it is shown that the expression for χ abcd (−ω; −ω, −ω, ω) is finite at ω = 0, avoiding nonphysical divergences presented in previous calculations when ω → 0. Ab initio band structure calculations using different pseudopotential schemes that include spin-orbit coupling are used to calculate the 2PA for several semiconductors, and the calculations are compared with available experimental results for photon energies that are below the optical band gap."
Fecha de publicación
diciembre de 2022
Tipo de publicación
Tesis de doctorado
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Cobertura
León, Guanajuato
Audiencia
Bibliotecarios
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Bernal-Ramírez, (2022). "Ab-initio calculation of two-photon absorption for semiconductors". Tesis de Doctorado en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato, México. 73 pp.
Repositorio Orígen
REPOSITORIO INSTITUCIONAL DEL CIO
Descargas
1177