The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies

Science Advances
Andrea TomadinKlaas-Jan Tielrooij

Abstract

For many of the envisioned optoelectronic applications of graphene, it is crucial to understand the subpicosecond carrier dynamics immediately following photoexcitation and the effect of photoexcitation on the electrical conductivity-the photoconductivity. Whereas these topics have been studied using various ultrafast experiments and theoretical approaches, controversial and incomplete explanations concerning the sign of the photoconductivity, the occurrence and significance of the creation of additional electron-hole pairs, and, in particular, how the relevant processes depend on Fermi energy have been put forward. We present a unified and intuitive physical picture of the ultrafast carrier dynamics and the photoconductivity, combining optical pump-terahertz probe measurements on a gate-tunable graphene device, with numerical calculations using the Boltzmann equation. We distinguish two types of ultrafast photo-induced carrier heating processes: At low (equilibrium) Fermi energy (EF ≲ 0.1 eV for our experiments), broadening of the carrier distribution involves interband transitions (interband heating). At higher Fermi energy (EF ≳ 0.15 eV), broadening of the carrier distribution involves intraband transitions (intraband heatin...Continue Reading

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Citations

Apr 3, 2021·Nature Materials·Laura KimHarry A Atwater
Apr 30, 2021·Nanoscale·Mathieu MassicotteKlaas-Jan Tielrooij
May 14, 2021·Nature Communications·A MontanaroE Pallecchi
Jul 23, 2020·Nano Letters·Wenhao ZhengHai I Wang
Mar 26, 2020·Nano Letters·Alexander TriesHai I Wang
Dec 12, 2020·ACS Nano·Jan-Christoph DeinertKlaas-Jan Tielrooij
Nov 20, 2019·Nano Letters·Xiaoyu JiaHai I Wang

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