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.
ZL (Wang Wang, Zilong) ; Molina-Sanchez
Real-time observation of the intravalley spin-flip process in single-layer WS2 Conference
EPJ Web of Conferences, vol. 205, no. 05012, Cerullo, G (Cerullo, G) ; Ogilvie, J (Ogilvie, J) ; Kartner, F (Kartner, F) ; Khalil, M (Khalil, M) ; Li, R (Li, R), 2019, ISSN: 2100-014X.
Abstract | Links | BibTeX | Tags: Chemistry, Condensed matter, Mechanics, Microscopy, Optics, Physics, Spectroscopy
@conference{nokey,
title = {Real-time observation of the intravalley spin-flip process in single-layer WS2},
author = {Wang, ZL (Wang, Zilong) ; Molina-Sanchez, A (Molina-Sanchez, Alejandro) ; Altmann, P (Altmann, Patrick) ; Sangalli, D (Sangalli, Davide) ; De Fazio, D (De Fazio, Domenico) ; Soavi, G (Soavi, Giancarlo) ; Sassi, U (Sassi, Ugo) ; Bottegoni, F (Bottegoni, Federico) ; Ciccacci, F (Ciccacci, Franco) ; Finazzi, M (Finazzi, Marco) ; Wirtz, L (Wirtz, Ludger) ; Ferrari, A (Ferrari, Andrea) ; Marini, A (Marini, Andrea) ; Cerullo, G (Cerullo, Giulio) ; Dal Conte, S (Dal Conte, Stefano) },
editor = {XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018)},
doi = {10.1051/epjconf/201920505012},
issn = {2100-014X},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
booktitle = {EPJ Web of Conferences},
volume = {205},
number = {05012},
publisher = {Cerullo, G (Cerullo, G) ; Ogilvie, J (Ogilvie, J) ; Kartner, F (Kartner, F) ; Khalil, M (Khalil, M) ; Li, R (Li, R)},
abstract = {We use helicity-resolved transient absorption spectroscopy to track intravalley scattering dynamics in monolayer WS2. We find that spin-polarized carriers scatter from upper to lower conduction band by reversing their spin orientation on a sub-ps timescale.},
keywords = {Chemistry, Condensed matter, Mechanics, Microscopy, Optics, Physics, Spectroscopy},
pubstate = {published},
tppubtype = {conference}
}
We use helicity-resolved transient absorption spectroscopy to track intravalley scattering dynamics in monolayer WS2. We find that spin-polarized carriers scatter from upper to lower conduction band by reversing their spin orientation on a sub-ps timescale.
0000
Marini, Andrea
Dynamical electron-phonon vertex correction Journal Article Forthcoming
In: Condensed Matter, Forthcoming, ISSN: 2501.01866.
Abstract | Links | BibTeX | Tags: Atomic and Molecular Physics, Condensed matter, General Physics and Astronomy, Optics, Physics
@article{nokey,
title = {Dynamical electron-phonon vertex correction},
author = {Andrea Marini},
editor = {Cornell University},
url = {https://arxiv.org/pdf/2501.01866},
doi = { https://doi.org/10.48550/arXiv.2501.01866},
issn = {2501.01866},
journal = {Condensed Matter},
abstract = {The dynamical screening of the electron--phonon vertex is caused by the retarded oscillations of the electronic charge following the electron--hole scattering with a phonon mode. This retardation induces a frequency dependence of the electron--phonon interaction. Model Hamiltonians and {em ab--initio} approaches have instilled the idea that this retardation is, in most of the cases, negligible. In this work I demonstrate that the dynamical screening of the electron--phonon vertex cannot be neglected {em a priori}. By using a perturbative expansion I introduce a controllable and physically sound method to evaluate and include dynamical screening effects. Based on the exact results of the homogeneous electron gas I propose a dynamical vertex correction function Γe−p(ω) designed to screen the commonly used adiabatic electron--phonon interaction. This function is expressed in terms of adiabatic quantities, that can be easily calculated and used to evaluate the strength of the dynamical corrections, even in realistic materials.},
keywords = {Atomic and Molecular Physics, Condensed matter, General Physics and Astronomy, Optics, Physics},
pubstate = {forthcoming},
tppubtype = {article}
}
The dynamical screening of the electron--phonon vertex is caused by the retarded oscillations of the electronic charge following the electron--hole scattering with a phonon mode. This retardation induces a frequency dependence of the electron--phonon interaction. Model Hamiltonians and {em ab--initio} approaches have instilled the idea that this retardation is, in most of the cases, negligible. In this work I demonstrate that the dynamical screening of the electron--phonon vertex cannot be neglected {em a priori}. By using a perturbative expansion I introduce a controllable and physically sound method to evaluate and include dynamical screening effects. Based on the exact results of the homogeneous electron gas I propose a dynamical vertex correction function Γe−p(ω) designed to screen the commonly used adiabatic electron--phonon interaction. This function is expressed in terms of adiabatic quantities, that can be easily calculated and used to evaluate the strength of the dynamical corrections, even in realistic materials.
