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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69def73088d1a
DTSTAMP:20260414T222552
DTSTART:20141215T133000
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DTEND:20141215T143000
URL:https://murmitoyen.com/events/vanille/udem/detail/554575-real-time-appr
 oach-to-nonlinear-reponse-in-solids-application-to-second-and-third-harmon
 ic-generation-claudio-attaccalite-institut-neel-cnrs
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Real-time approach to nonlinear reponse in solids: application to s
 econd- and third-harmonic generation - Claudio Attaccalite (Institut Neel\
 , CNRS)
DESCRIPTION:Dr. Claudio Attaccalite\, Institut Neel\, CNRS\, GrenobleWe pre
 sent a real-time approach to study nonlinear optical properties in Condens
 ed Matter systems that is especially suitable for crystalline solids[1]. T
 he equation of motions and the coupling of the electrons with the external
  electric field are derived from the Berry phase formulation of the dynami
 cal polarization. Many-body effects are introduced by adding single-partic
 le operators to the independent-particle Hamiltonian. Specifically we incl
 ude crystal local field effects\, renormalization of the energy levels and
  excitonic effects. The approach is validated by calculating the second an
 d third harmonic generation of bulk semiconductors. Finally we present sec
 ond-harmonic generation spectrum of h-BN or MoS2 monolayers and we show th
 at correlation effects double the signal intensity at the excitonic resona
 nces with respect to the contribution from independent electronic transiti
 ons.[2][1] Nonlinear optics from an ab-initio approach by means of the dyn
 amical Berry phase: Application to second-and third-harmonic generation in
  semiconductors\, C Attaccalite\, M Grüning\, Phys. Rev. B 88 (23)\, 2351
 13 (2013)[2] Second harmonic generation in h-BN and MoS2 monolayers: Role 
 of electron-hole interaction\, M. Grüning and C. Attaccalite\, Phys. Rev.
  B 89\, 081102(R) (2014) Cette conférence est présentée par le RQMP Ve
 rsant Nord du Département de physique de l'Université de Montréal et 
 le Département de génie physique de Polytechnique Montréal.
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