Ultrafast terahertz conductivity in epitaxial graphene nanoribbons: an interplay between photoexcited and secondary hot carriers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00600753" target="_blank" >RIV/68378271:_____/25:00600753 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10509087

Výsledek na webu

<a href="https://hdl.handle.net/11104/0358050" target="_blank" >https://hdl.handle.net/11104/0358050</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/ad8e71" target="_blank" >10.1088/1361-6463/ad8e71</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ultrafast terahertz conductivity in epitaxial graphene nanoribbons: an interplay between photoexcited and secondary hot carriers

Popis výsledku v původním jazyce

Optical pump-terahertz probe spectroscopy was used to investigate ultrafast photo-induced charge carrier transport in graphene nanoribbons upon scaling the optical pump intensity. For low pump fluences, the deposited pump energy is rapidly redistributed through carrier-carrier scattering, producing secondary hot carriers: the picosecond THz photoconductivity then acquires a negative sign and scales linearly with an increasing pump fluence. At higher fluences, there are not enough equilibrium carriers able to accept the deposited energy, directly generated carriers start to contribute significantly to the photoconductivity with a positive sign leading to its saturation. This leads to a non-monotonic variation of the carrier mobility and plasmonic resonance frequency as a function of the pump fluence. In addition, a weak carrier localization observed at low pump fluences is progressively lifted upon increasing the pump fluence as a result of the rise of initial carrier temperature.

Název v anglickém jazyce

Ultrafast terahertz conductivity in epitaxial graphene nanoribbons: an interplay between photoexcited and secondary hot carriers

Popis výsledku anglicky

Optical pump-terahertz probe spectroscopy was used to investigate ultrafast photo-induced charge carrier transport in graphene nanoribbons upon scaling the optical pump intensity. For low pump fluences, the deposited pump energy is rapidly redistributed through carrier-carrier scattering, producing secondary hot carriers: the picosecond THz photoconductivity then acquires a negative sign and scales linearly with an increasing pump fluence. At higher fluences, there are not enough equilibrium carriers able to accept the deposited energy, directly generated carriers start to contribute significantly to the photoconductivity with a positive sign leading to its saturation. This leads to a non-monotonic variation of the carrier mobility and plasmonic resonance frequency as a function of the pump fluence. In addition, a weak carrier localization observed at low pump fluences is progressively lifted upon increasing the pump fluence as a result of the rise of initial carrier temperature.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics D-Applied Physics

ISSN

0022-3727

e-ISSN

1361-6463

Svazek periodika

58

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

045307

Kód UT WoS článku

001353743400001

EID výsledku v databázi Scopus

2-s2.0-85219424446