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Issue 20, 2019
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Spatio-temporal dynamics in graphene

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Temporally and spectrally resolved dynamics of optically excited carriers in graphene has been intensively studied theoretically and experimentally, whereas carrier diffusion in space has attracted much less attention. Understanding the spatio-temporal carrier dynamics is of key importance for optoelectronic applications, where carrier transport phenomena play an important role. In this work, we provide a microscopic access to the time-, momentum-, and space-resolved dynamics of carriers in graphene. We determine the diffusion coefficient to be D ≈ 360 cm2 s−1 and reveal the impact of carrier–phonon and carrier–carrier scattering on the diffusion process. In particular, we show that phonon-induced scattering across the Dirac cone gives rise to back-diffusion counteracting the spatial broadening of the carrier distribution.

Graphical abstract: Spatio-temporal dynamics in graphene

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Article information

25 Feb 2019
21 Apr 2019
First published
13 May 2019

This article is Open Access

Nanoscale, 2019,11, 10017-10022
Article type

Spatio-temporal dynamics in graphene

R. Jago, R. Perea-Causin, S. Brem and E. Malic, Nanoscale, 2019, 11, 10017
DOI: 10.1039/C9NR01714C

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