CMSP Seminar (Atomistic Simulation Seminar Series) 9 October, 14:00hrs, by D. Scherlis

[CMSP Seminars Secretariat]

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CMSP Seminar (Atomistic Simulation Seminar Series)
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*Wednesday, 9 October 2024, 14:00 hrs*
*/Luigi Stasi Seminar Room (Leonardo Building, first floor)/*/
/
/Zoom registration link: 
https://zoom.us/meeting/register/tJ0rc-6gqDktHdzMNdw1kL2929gjCztNrWdB<https://zoom.us/meeting/register/tJIqf-ihrzkqH9AgyozbVO89Im32vIxe3ubZ>
<https://zoom.us/meeting/register/tJ0rc-6gqDktHdzMNdw1kL2929gjCztNrWdB> /

Speaker:*  Damian Scherlis * (University of Buenos Aires INQUIMAE - CONICET)

Title: *Modeling light emission from semiconducting polymers *

Abstract:
We will present two approaches to describe the electron dynamics in 
molecules coupled to photon emission, derived respectively from 
semiclassical and from quantum electrodynamics (QED) treatments. 
Remarkably, one of the driving terms present in the QED equation of 
motion exactly matches the driving term of the semiclassical 
approximation. This coincidence highlights the missing piece in the 
semiclassical scheme, portraying two regimes: (i) weakly excited 
systems, where semiclassical dynamics dominate and emission power is 
controlled by the coherences; and (ii) strongly excited systems or 
eigenstates, where a full quantum treatment is mandatory to recover the 
power, controlled by the populations. We will show applications of these 
formalisms to model radiation in response to currents or laser pulses. 
In particular we address with these methodologies the 
electroluminescence of organic polymers (OLEDs), and collective optical 
phenomena as superradiance and subradiance.

Refs:
[1] Phys. Rev. Lett. 126, 087401 (2021)
[2] J. Phys. Chem. Lett. 13, 11601 (2022)
[3] J. Chem. Phys. 160, 214102 (2024)


http://www.ictp.it/research/cmsp.aspx

The Abdus Salam International Centre for Theoretical Physics
https://www.ictp.it/

    
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