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Title: Energy flows in graphene: hot carrier dynamics and cooling

Journal Article · · Journal of Physics. Condensed Matter
 [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Long lifetimes of hot carriers can lead to qualitatively new types of responses in materials. The magnitude and time scales for these responses reflect the mechanisms governing energy flows. We examine the microscopics of two processes which are key for energy transport, focusing on the unusual behavior arising due to graphene's unique combination of material properties. One is hot carrier generation in its photoexcitation dynamics, where hot carriers multiply through an Auger type carrier–carrier scattering cascade. The hot-carrier generation manifests itself through elevated electronic temperatures which can be accessed in a variety of ways, in particular optical conductivity measurements. Another process of high interest is electron-lattice cooling. We survey different cooling pathways and discuss the cooling bottleneck arising for the momentum-conserving electron–phonon scattering pathway. We show how this bottleneck can be relieved by higher-order collisions—supercollisions—and examine the variety of supercollision processes that can occur in graphene.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
SC0001088; N00014-09-1-0724
OSTI ID:
1557604
Journal Information:
Journal of Physics. Condensed Matter, Vol. 27, Issue 16; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Asymmetric hot-carrier thermalization and broadband photoresponse in graphene-2D semiconductor lateral heterojunctions journal June 2019
Resonant supercollisions and electron-phonon heat transfer in graphene journal February 2018
Quantum-critical conductivity of the Dirac fluid in graphene journal February 2019
Resonant electron-lattice cooling in graphene journal June 2018
Theory of photoexcited and thermionic emission across a two-dimensional graphene-semiconductor Schottky junction journal May 2018
Fano fluctuations in superconducting-nanowire single-photon detectors journal August 2017
Dirac quantum time mirror journal April 2017
Highly efficient hot electron harvesting from graphene before electron-hole thermalization journal November 2019
Dirac quantum time mirror text January 2017
Dirac quantum time mirror text January 2016
Resonant supercollisions and electron-phonon heat transfer in graphene text January 2017
Resonant electron-lattice cooling in graphene text January 2017
Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene journal June 2016
Asymmetric hot-carrier thermalization and broadband photoresponse in graphene-2D semiconductor lateral heterojunctions journal June 2019
Highly efficient hot electron harvesting from graphene before electron-hole thermalization journal November 2019
Comparative Analysis of Room Temperature Plasmonic Graphene Hot Electron Bolometric Photodetectors preprint January 2020

Figures / Tables (6)