AB-INITIO CALCULATION OF TWO-PHOTON ABSORPTION FOR SEMICONDUCTORS

dc.contributorBernardo Mendoza
dc.creatorALAN BERNAL
dc.date2022-12
dc.date.accessioned2023-07-21T15:15:58Z
dc.date.available2023-07-21T15:15:58Z
dc.identifierhttp://cio.repositorioinstitucional.mx/jspui/handle/1002/1276
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7726030
dc.description"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."
dc.formatapplication/pdf
dc.languageeng
dc.relationcitation: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.
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Autor/Two-photon
dc.subjectinfo:eu-repo/classification/Autor/Absorption
dc.subjectinfo:eu-repo/classification/Autor/Semiconductors
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/22
dc.subjectinfo:eu-repo/classification/cti/2209
dc.subjectinfo:eu-repo/classification/cti/2209
dc.titleAB-INITIO CALCULATION OF TWO-PHOTON ABSORPTION FOR SEMICONDUCTORS
dc.typeinfo:eu-repo/semantics/doctoralThesis
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.coverageLeón, Guanajuato
dc.audiencelibrarians
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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