Publications

@article{Marini2023,

title = {Equilibrium and out-of-equilibrium realistic phonon self-energy free from overscreening},

author = {Andrea Marini},

url = {http://doi.org/10.1103/PhysRevB.107.024305},

doi = {10.1103/PhysRevB.107.024305},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {Phys. Rev. B},

volume = {107},

issue = {2},

keywords = {General Engineering},

pubstate = {published},

tppubtype = {article}

}

@article{Smejkal2022,

title = {Photonic effects in the non-equilibrium optical response of two-dimensional semiconductors},

author = {Valerie Smejkal and Chiara Trovatello and Qiuyang Li and Stefano Dal Conte and Andrea Marini and Xiaoyang Zhu and Giulio Cerullo and Florian Libisch},

doi = {10.1364/oe.479518},

issn = {1094-4087},

year  = {2023},

date = {2023-00-00},

journal = {Opt. Express},

volume = {31},

number = {1},

publisher = {Optica Publishing Group},

abstract = {<jats:p>Transient absorption spectroscopy is a powerful tool to monitor the out-of-equilibrium optical response of photoexcited semiconductors. When this method is applied to two-dimensional semiconductors deposited on different substrates, the excited state optical properties are inferred from the pump-induced changes in the transmission/reflection of the probe, <jats:italic>i.e.</jats:italic>, Δ<jats:italic>T</jats:italic>/<jats:italic>T</jats:italic> or Δ<jats:italic>R</jats:italic>/<jats:italic>R</jats:italic>. Transient optical spectra are often interpreted as the manifestation of the intrinsic optical response of the monolayer, including effects such as the reduction of the exciton oscillator strength, electron-phonon coupling or many-body interactions like bandgap renormalization, trion or biexciton formation. Here we scrutinize the assumption that one can determine the non-equilibrium optical response of the TMD without accounting for the substrate used in the experiment. We systematically investigate the effect of the substrate on the broadband transient optical response of monolayer MoS<jats:sub>2</jats:sub> (1L-MoS<jats:sub>2</jats:sub>) by measuring Δ<jats:italic>T</jats:italic>/<jats:italic>T</jats:italic> and Δ<jats:italic>R</jats:italic>/<jats:italic>R</jats:italic> with different excitation photon energies. Employing the boundary conditions given by the Fresnel equations, we analyze the transient transmission/reflection spectra across the main excitonic resonances of 1L-MoS<jats:sub>2</jats:sub>. We show that pure interference effects induced by the different substrates explain the substantial differences (<jats:italic>i.e.</jats:italic>, intensity, peak energy and exciton linewidth) observed in the transient spectra of the same monolayer. We thus demonstrate that the substrate strongly affects the magnitude of the exciton energy shift and the change of the oscillator strength in the transient optical spectra. By highlighting the key role played by the substrate, our results set the stage for a unified interpretation of the transient response of optoelectronic devices based on a broad class of TMDs.</jats:p>},

keywords = {and Optics, Atomic and Molecular Physics},

pubstate = {published},

tppubtype = {article}

}

@article{Smejkal2020,

title = {Time-Dependent Screening Explains the Ultrafast Excitonic Signal Rise in 2D Semiconductors},

author = {Valerie Smejkal and Florian Libisch and Alejandro Molina-Sanchez and Chiara Trovatello and Ludger Wirtz and Andrea Marini},

doi = {10.1021/acsnano.0c08173},

issn = {1936-086X},

year  = {2021},

date = {2021-01-26},

journal = {ACS Nano},

volume = {15},

number = {1},

pages = {1179–1185},

publisher = {American Chemical Society (ACS)},

keywords = {General Engineering, General Materials Science, General Physics and Astronomy},

pubstate = {published},

tppubtype = {article}

}

@article{Trovatello2020,

title = {Strongly Coupled Coherent Phonons in Single-Layer MoS_2},

author = {Chiara Trovatello and Henrique P. C. Miranda and Alejandro Molina-Sánchez and Rocío Borrego-Varillas and Cristian Manzoni and Luca Moretti and Lucia Ganzer and Margherita Maiuri and Junjia Wang and Dumitru Dumcenco and Andras Kis and Ludger Wirtz and Andrea Marini and Giancarlo Soavi and Andrea C. Ferrari and Giulio Cerullo and Davide Sangalli and Stefano Dal Conte},

doi = {10.1021/acsnano.0c00309},

issn = {1936-086X},

year  = {2020},

date = {2020-05-26},

journal = {ACS Nano},

volume = {14},

number = {5},

pages = {5700–5710},

publisher = {American Chemical Society (ACS)},

keywords = {General Engineering, General Materials Science, General Physics and Astronomy},

pubstate = {published},

tppubtype = {article}

}

@article{Pogna2016,

title = {Photo-Induced Bandgap Renormalization Governs the Ultrafast Response of Single-Layer MoS_2},

author = {Eva A. A. Pogna and Margherita Marsili and Domenico De Fazio and Stefano Dal Conte and Cristian Manzoni and Davide Sangalli and Duhee Yoon and Antonio Lombardo and Andrea C. Ferrari and Andrea Marini and Giulio Cerullo and Deborah Prezzi},

doi = {10.1021/acsnano.5b06488},

issn = {1936-086X},

year  = {2016},

date = {2016-01-26},

journal = {ACS Nano},

volume = {10},

number = {1},

pages = {1182–1188},

publisher = {American Chemical Society (ACS)},

keywords = {General Engineering, General Materials Science, General Physics and Astronomy},

pubstate = {published},

tppubtype = {article}

}