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SUMMARY:Electron-phonon\, electron-electron and phonon-phonon interactions
 : applications to equilibrium and non-equilibrium spectroscopy - Giovanni 
 Marini (University Of Trento)
DTSTART:20241017T130000Z
DTEND:20241017T140000Z
UID:TALK212449@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:In this talk I will discuss new developments and applications 
 by our group for what pertains the inclusion of electron-phonon\, electron
 -electron and phonon-phonon interactions in beyond state of the art comput
 ational schemes for the calculation of spectroscopic quantities. I will ma
 inly focus on two aspects.\n\n(i) Optical properties of materials: I will 
 present a new computational scheme to calculate the optical properties of 
 materials from first principles. This approach combines the recently intro
 duced cumulant expansion for the two-particle correlation function [1] wit
 h a proper treatment of the exciton-phonon coupling [2]. I will present an
  application to single-layer boron nitride and discuss its absorption and 
 photoluminescence spectra\, providing a novel interpretation for its contr
 oversial photoluminescence spectral features [3\,4].\n\n(ii) Non-equilibri
 um (ultrafast) spectroscopy: I will introduce a new workflow\, developed w
 ithin the EPIq code [5]\, for the description the real-time carrier dynami
 cs in pump-probe experiments on semiconductors. The implementation is base
 d on an equal footing treatment of electron-electron\, electron-phonon and
  phonon-phonon scattering channels. Within this approach we are able to de
 scribe the real-time evolution of photoexcited electron-hole plasma and to
  access many experimentally measurable time-resolved observables related t
 o the coherent phonon dynamics and its damping by the inclusion of anharmo
 nic effects.\n\nThis work was funded by the European Union (ERC\, DELIGHT 
 \, 101052708). Views and opinions expressed are however those of the autho
 r(s) only and do not necessarily reflect those of the European Union or th
 e European Research Council. Neither the European Union nor the granting a
 uthority can be held responsible for them.\n\n[1] P. Cudazzo\, L. Reining\
 , Phys. Rev. Research\, 2\, 012032 (2020)\n\n[2] P. Cudazzo\, Phys. Rev. B
 \, 108\, 165101 (2023)\n\n[3] C. Elias\, P. Valvin\, T. Pelini\, A. Summer
 field\, C. Mellor\, T. Cheng\, L. Eaves\, C. Foxon\, P. Beton\, S. Novikov
 \, B. Gil\, G. Cassabois\, Nat. Commun.\, 10\, 2639 (2019)\n\n[4] A. Rouss
 eau\, L. Ren\, A. Durand\, P. Valvin\, B. Gil\, K. Watanabe\, T. Taniguchi
 \, B. Urbaszek\, X. Marie\, C. Robert\, G. Cassabois\, Nano Lett.\, 21\, 1
 0133-10138 (2021)\n\n[5] G. Marini\, G. Marchese\, G. Profeta\, J. Sjakste
 \, F. Macheda\, N. Vast\, F. Mauri\, M. Calandra\, Computer Physics Commun
 ications\, 295\, 108950 (2024)
LOCATION:TCM Seminar Room
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