Microscopic origins of the terahertz carrier relaxation and cooling dynamics in graphene.

Abstract:

:The ultrafast dynamics of hot carriers in graphene are key to both understanding of fundamental carrier-carrier interactions and carrier-phonon relaxation processes in two-dimensional materials, and understanding of the physics underlying novel high-speed electronic and optoelectronic devices. Many recent experiments on hot carriers using terahertz spectroscopy and related techniques have interpreted the variety of observed signals within phenomenological frameworks, and sometimes invoke extrinsic effects such as disorder. Here, we present an integrated experimental and theoretical programme, using ultrafast time-resolved terahertz spectroscopy combined with microscopic modelling, to systematically investigate the hot-carrier dynamics in a wide array of graphene samples having varying amounts of disorder and with either high or low doping levels. The theory reproduces the observed dynamics quantitatively without the need to invoke any fitting parameters, phenomenological models or extrinsic effects such as disorder. We demonstrate that the dynamics are dominated by the combined effect of efficient carrier-carrier scattering, which maintains a thermalized carrier distribution, and carrier-optical-phonon scattering, which removes energy from the carrier liquid.

journal_name

Nat Commun

journal_title

Nature communications

authors

Mihnev MT,Kadi F,Divin CJ,Winzer T,Lee S,Liu CH,Zhong Z,Berger C,de Heer WA,Malic E,Knorr A,Norris TB

doi

10.1038/ncomms11617

subject

Has Abstract

pub_date

2016-05-25 00:00:00

pages

11617

issn

2041-1723

pii

ncomms11617

journal_volume

7

pub_type

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