2022
CEP (Villegas Villegas, Cesar E. P. ) ; Leite
Efficient hot-carrier dynamics in near-infrared photocatalytic metals Journal Article
In: Physical Review B, vol. 105, iss. 16, no. 165109, 2022, ISSN: 2469-9950; eISSN 2469-9969.
Abstract | Links | BibTeX | Tags: Applied, Atomic and Molecular Physics, Condensed matter, General Materials Science, General Physics and Astronomy, Multidisciplinary, Physics
@article{nokey,
title = {Efficient hot-carrier dynamics in near-infrared photocatalytic metals},
author = {Villegas, CEP (Villegas, Cesar E. P.) ; Leite, MS (Leite, Marina S.) ; Marini, A (Marini, Andrea) ; Rocha, AR (Rocha, Alexandre R.)},
editor = {AMER PHYSICAL SOC},
url = {https://www.webofscience.com/wos/woscc/full-record/WOS:000807392800005},
doi = {10.1103/PhysRevB.105.165109},
issn = {2469-9950; eISSN 2469-9969},
year = {2022},
date = {2022-04-07},
journal = {Physical Review B},
volume = {105},
number = {165109},
issue = {16},
abstract = {Photoexcited metals can produce highly energetic hot carriers whose controlled generation and extraction is a promising avenue for technological applications. While hot-carrier dynamics in Au-group metals have been widely investigated, a microscopic description of the dynamics of photoexcited carriers in the mid-infrared and near-infrared Pt-group metals range is still scarce. Since these materials are widely used in catalysis and, more recently, in plasmonic catalysis, their microscopic carrier dynamics characterization is crucial. We employ ab initio many-body perturbation theory to investigate the hot-carrier generation, relaxation times, and mean free path in bulk Pd and Pt. We show that the direct optical transitions of photoexcited carriers in these metals are mainly generated in the near-infrared range. We also find that the electron-phonon mass enhancement parameter for Pt is 16% higher than Pd, a result that helps explain several experimental results showing diverse trends. Moreover, we predict that Pd (Pt) hot electrons possess total relaxation times of up to 35 fs (24 fs), taking place at approximately 0.5 eV (1.0 eV) above the Fermi energy. Finally, an efficient hot electron generation and extraction can be achieved in nanofilms of Pd (110) and Pd (100) when subject to excitation energies ranging from 0.4 to 1.6 eV.},
keywords = {Applied, Atomic and Molecular Physics, Condensed matter, General Materials Science, General Physics and Astronomy, Multidisciplinary, Physics},
pubstate = {published},
tppubtype = {article}
}
Photoexcited metals can produce highly energetic hot carriers whose controlled generation and extraction is a promising avenue for technological applications. While hot-carrier dynamics in Au-group metals have been widely investigated, a microscopic description of the dynamics of photoexcited carriers in the mid-infrared and near-infrared Pt-group metals range is still scarce. Since these materials are widely used in catalysis and, more recently, in plasmonic catalysis, their microscopic carrier dynamics characterization is crucial. We employ ab initio many-body perturbation theory to investigate the hot-carrier generation, relaxation times, and mean free path in bulk Pd and Pt. We show that the direct optical transitions of photoexcited carriers in these metals are mainly generated in the near-infrared range. We also find that the electron-phonon mass enhancement parameter for Pt is 16% higher than Pd, a result that helps explain several experimental results showing diverse trends. Moreover, we predict that Pd (Pt) hot electrons possess total relaxation times of up to 35 fs (24 fs), taking place at approximately 0.5 eV (1.0 eV) above the Fermi energy. Finally, an efficient hot electron generation and extraction can be achieved in nanofilms of Pd (110) and Pd (100) when subject to excitation energies ranging from 0.4 to 1.6 eV.
2019
C (Trovatello Trovatello, Chiara) ; Miranda
Strong Exciton-Coherent Phonon Coupling In Single-Layer MoS2 Proceedings Article
In: LASERS, 2019 CONFERENCE ON; (CLEO), ELECTRO-OPTICS (Ed.): Conference on Lasers and Electro-Optics, 2019, ISBN: 978-1-943580-57-6; ISSN 2160-9020.
Abstract | Links | BibTeX | Tags: Applied, Electric & Electronic, General Engineering, Optics, Physics
@inproceedings{nokey,
title = {Strong Exciton-Coherent Phonon Coupling In Single-Layer MoS2},
author = {Trovatello, C (Trovatello, Chiara) ; Miranda, HPC (Miranda, Henrique P. C.) ; Molina-Sánchez, A (Molina-Sanchez, Alejandro) ; Varillas, RB (Varillas, Rocio Borrego) ; Moretti, L (Moretti, Luca) ; Ganzer, L (Ganzer, Lucia) ; Maiuri, M (Maiuri, Margherita) ; Soavi, G (Soavi, Giancarlo) ; Ferrari, AC (Ferrari, Andrea C.) ; Marini, A (Marini, Andrea) ; Wirtz, L (Wirtz, Ludger) ; Cerullo, G (Cerullo, Giulio) ; Sangalli, D (Sangalli, Davide) ; Dal Conte, S (Dal Conte, Stefano)},
editor = {2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)},
url = {https://www.webofscience.com/wos/woscc/summary/6adb417d-7241-4ee4-a70c-46a96938e0e3-014078f410/relevance/1},
isbn = {978-1-943580-57-6; ISSN 2160-9020},
year = {2019},
date = {2019-09-09},
urldate = {2019-09-09},
booktitle = {Conference on Lasers and Electro-Optics},
abstract = {We use broadband optical pump-probe spectroscopy to study coherent optical phonons in 1L-MoS2. We detect a strong coupling with the A'(1) mode, which is enhanced around the C-exciton peak. Ab-initio calculations of the phonon-induced band structure variation fully confirm this result.},
keywords = {Applied, Electric & Electronic, General Engineering, Optics, Physics},
pubstate = {published},
tppubtype = {inproceedings}
}
We use broadband optical pump-probe spectroscopy to study coherent optical phonons in 1L-MoS2. We detect a strong coupling with the A'(1) mode, which is enhanced around the C-exciton peak. Ab-initio calculations of the phonon-induced band structure variation fully confirm this result.
