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Hot Carriers in Graphene.

Song, Justin Chien Wen.

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Hot Carriers in Graphene.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hot Carriers in Graphene./
Author:	Song, Justin Chien Wen.
Description:	190 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
Contained By:	Dissertation Abstracts International76-03B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645068
ISBN:	9781321335439

Hot Carriers in Graphene.
Song, Justin Chien Wen.

Hot Carriers in Graphene. - 190 p.

Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2014.

This item must not be sold to any third party vendors.

When energy relaxation between electrons and the lattice is slow, an elevated electronic temperature different from that of the lattice persists. In this regime, hot charge carriers control the energy transport in a material. In this thesis, I show how hot carriers can dominate graphene's response enabling it to exhibit novel properties.

ISBN: 9781321335439Subjects--Topical Terms:

3173567
Condensed matter physics.

Hot Carriers in Graphene.
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020 $a 9781321335439
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100 1 $a Song, Justin Chien Wen. $3 3173999
245 1 0 $a Hot Carriers in Graphene.
300 $a 190 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
500 $a Adviser: Leonid Levitov.
502 $a Thesis (Ph.D.)--Harvard University, 2014.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a When energy relaxation between electrons and the lattice is slow, an elevated electronic temperature different from that of the lattice persists. In this regime, hot charge carriers control the energy transport in a material. In this thesis, I show how hot carriers can dominate graphene's response enabling it to exhibit novel properties.
520 $a First, I examine how light is converted to electrical currents in graphene and show that hot carriers play an integral role in this multi-stage process. I show that photocurrent in graphene p-n junctions is dominated by a Photo-thermoelectric effect in which a light-induced elevated hot carrier temperature drives a thermoelectric current. Furthermore, I show that the generation and cooling of hot carriers in graphene during photoexcitation proceeds in an unusual way. In the former, carrier-carrier scattering dominates the initial photoexcitation cascade enabling efficient hot carrier generation. In the latter, a new cooling mechanism -- disorder-assisted scattering (supercollisions) -- dominates electron-lattice cooling over a wide range of temperatures (including room temperature).
520 $a Second, I examine the transport characteristics of double layer graphene heterostructures (specifically, G/h-BN/G heterostructures). I show that Coulomb coupling results in vertical (out-of-plane) energy transfer between electrons in proximal (but electrically insulated) graphene layers. This couples lateral (in-plane) charge and energy transport of electrons in the two layers to give rise to a new energy-driven Coulomb drag (inter-layer transresistance) that dominates when the two layers are at charge neutrality.
520 $a Third, I examine energy transport in charge neutral graphene. I show that the combination of fast carrier-carrier scattering, high electronic quality, and slow electron-lattice cooling (hot carriers) gives rise to a regime of ballistic heat transport. This manifest as electronic energy waves with velocity on the order of graphene's Fermi velocity.
520 $a The new phenomena enabled by hot carriers and the ideas/approaches described in this thesis provide a basis with which to exploit hot carrier effects in graphene and opens new vistas for controlling and harnessing energy flows on the nanoscale.
590 $a School code: 0084.
650 4 $a Condensed matter physics. $3 3173567
690 $a 0611
710 2 $a Harvard University. $b Engineering and Applied Sciences. $3 2093136
773 0 $t Dissertation Abstracts International $g 76-03B(E).
790 $a 0084
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645068