Ultrafast plasmon thermalization in epitaxial graphene probed by time-resolved THz spectroscopy

0551642 - FZÚ 2022 RIV DE eng J - Článek v odborném periodiku
Paingad, Vaisakh Chelod - Kunc, J. - Rejhon, M. - Rychetský, Ivan - Mohelský, I. - Orlita, M. - Kužel, Petr
Ultrafast plasmon thermalization in epitaxial graphene probed by time-resolved THz spectroscopy.
Advanced Functional Materials. Roč. 31, č. 45 (2021), č. článku 2105763. ISSN 1616-301X. E-ISSN 1616-3028
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GX19-28375X; GA MŠMT LM2018110
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: carrier cooling * epitaxial graphene * Fermi level * localized plasmon * sheet conductivity * terahertz * ultrafast thermalization dynamics
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 19.924, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1002/adfm.202105763

The control of carrier transport by electrical, chemical, or optical Fermi level tuning is central to graphene electronics. Here, an optical pump-terahertz (THz) probe spectroscopy is applied to investigate ultrafast sheet conductivity dynamics in various epitaxially grown graphene layers representing a large variety of carbon allotropes, including H2 intercalated films. The graphene layers display a prominent plasmonic response connected with induced THz transparency spectra on ultrashort timescale. It is shown that the plasmonic confinement potentials act within micrometer-sized domains with essentially isotropic character. The measured ultrafast dynamics are entirely controlled by the quasi-Fermi level of laser-excited carriers through their temperature. The photocarriers undergo a disorder-enabled super-collision cooling process with an initial picosecond transfer of the optically deposited heat to the lattice followed by a sub-nanosecond relaxation governed by the lattice cooling.
Trvalý link: http://hdl.handle.net/11104/0326888