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http://cio.repositorioinstitucional.mx/jspui/handle/1002/1276| AB-INITIO CALCULATION OF TWO-PHOTON ABSORPTION FOR SEMICONDUCTORS | |
| ALAN BERNAL | |
| Bernardo Mendoza | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Two-photon Absorption Semiconductors | |
| "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." | |
| 2022-12 | |
| Tesis de doctorado | |
| Inglés | |
| León, Guanajuato | |
| Bibliotecarios Estudiantes Investigadores Público en general | |
| 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. | |
| ÓPTICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | DOCTORADO EN CIENCIAS (ÓPTICA) |
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| Fichero | Descripción | Tamaño | Formato | |
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| 18313.pdf | Texto completo / Full text | 3.06 MB | Adobe PDF | Visualizar/Abrir |