Gate-tunable ultrafast optical response of single-layer graphene
| Autor: | Giulio Cerullo, Paolo Pedrinazzi, Giancarlo Soavi, Andrea C. Ferrari, Eva A. A. Pogna, Michele Guizzardi, Marco Polini, Osman Balci, Andrea Tomadin |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Optical Society of America (2019). doi:10.1109/CLEOE-EQEC.2019.8873251 info:cnr-pdr/source/autori:Pogna E.A.A.; Balci O.; Pedrinazzi P.; Guizzardi M.; Tomadin A.; Soavi G.; Polini M.; Ferrari A.C.; Cerullo G./titolo:Gate-tunable ultrafast optical response of single-layer graphene/doi:10.1109%2FCLEOE-EQEC.2019.8873251/rivista:Optical Society of America/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| DOI: | 10.1109/CLEOE-EQEC.2019.8873251 |
| Popis: | The ultrafast relaxation dynamics in single-layer graphene (SLG) is of key importance for its applications in optoelectronic devices which rely on the dynamic response of charge carriers, such as photodetectors, saturable absorbers and modulators[1]. The absorption via interband transitions of a photon of energy in ħω SLG promotes an electron from an energy −ħω/2 in the valence band to an energy ħω/2 in the conduction band. This strongly non-equilibrium distribution thermalizes by electron-electron scattering (t∼ 10–20 fs) to a hot Fermi-Dirac (FD) distribution, which in turn equilibrates with the cold lattice via interaction with strongly-coupled optical phonons (SCOP, t∼200–300 fs) and, on a longer time scale, via anharmonic coupling with acoustic phonons (t∼ 1–2 ps) [2]. |
| Databáze: | OpenAIRE |
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