Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W40: Exotic Exciton Transport and Polaritons in Nanostructures
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 232
Sponsoring
Unit:
DMP
Chair: Xiaojia Wang, University of Minnesota
Abstract: W40.00006 : Exciton ground state bleaching in (6,5) single walled carbon nanotubes*
4:24 PM–4:36 PM
Presenter:
Stefano Dal Forno
(Nanyang Technological University)
Authors:
Stefano Dal Forno
(Nanyang Technological University)
Marco Battiato
(Nanyang Technological University, Singapore)
We explore a wide range of initial conditions and determine the dependency of the absorption spectrum as a function of the exciton and phonon populations.
Specifically, we investigate the behaviour of the dominant excitonic peak and the phonon side-bands arising from exciton-phonon coupling.
We observe two distinct behaviours depending on the excitonic statistics.
At low occupancy (i.e. bosonic excitons) there is little to no change in the absorption spectrum.
On the other hand, at high occupancy (i.e. fermionic excitons) we observe an important weakening of both the main excitonic peak and the phonon side-bands.
Most importantly, we observe a "negative" absorption corresponding to the emission of light caused by an excitonic population-inversion effect.
This effect is cause by a Pauli blocking mechanism which is responsible for the bleaching effect observed in many pump-probe experiments.
*Nanyang Technological University, Singapore, grant NAP SUG
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