Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M46: Excited State III: electron-phonon coupling
8:00 AM–10:48 AM,
Wednesday, March 16, 2022
Room: McCormick Place W-470A
Sponsoring Units: DCOMP DMP
Chair: Feliciano Giustino, University of Texas
Abstract: M46.00010 : Ultrafast dynamics of hot carriers in bulk semiconductors and in accumulation layer: energy transfer and screening effects.*
10:12 AM–10:24 AM
We will present our results on the photoexcited electron relaxation in InSe, a quasi-2D material which was shown recently to have potential interest for optoelectronics. We will discuss our results on the relaxation dynamics and screening of the electron-phonon interaction in doped InSe. The influence of the two-dimensional (2D) electron gas, created on the InSe surface by Cs deposition, on the relaxation dynamics of photoexcited electrons, was stydied by photoemission spectroscopy and by ab initio calculations. We have shown that the remote coupling with the bulk phonons persists even in the case of complete thermalisation of the photoexcited electrons with the 2D gas, and that the coupling of electrons with polar optical phonons is not completely screened even at high Cs concentrations.
* This work was granted access to high performance computing resources by the Partnership for Advanced Computing in Europe (PRACE Project No. 2019204962), by the French HPC centers GENCI-IDRIS, GENCI-CINES and GENCI-TGCC (Project 2210) and by the École Polytechnique through the 3L-hpc project.
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