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Electronic cooling via interlayer Coulomb coupling in multilayer epitaxial graphene

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9105· OSTI ID:1624000
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States); DOE/OSTI
  2. Univ. of Texas, Austin, TX (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States); Peking Univ., Beijing (China)
  5. Inst. for Research in Fundamental Sciences (IPM), Tehran (Iran)
  6. Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa (Italy); Istituto Italiano di Tecnologia, Genova (Italy)
  7. Inst. Neel, Grenoble (France); Georgia Inst. of Technology, Atlanta, GA (United States)
  8. King Abdulaziz Univ., Jeddah (Saudi Arabia)
In van der Waals bonded or rotationally disordered multilayer stacks of two-dimensional (2D) materials, the electronic states remain tightly confined within individual 2D layers. As a result, electron–phonon interactions occur primarily within layers and interlayer electrical conductivities are low. In addition, strong covalent in-plane intralayer bonding combined with weak van der Waals interlayer bonding results in weak phonon-mediated thermal coupling between the layers. We demonstrate here, however, that Coulomb interactions between electrons in different layers of multilayer epitaxial graphene provide an important mechanism for interlayer thermal transport, even though all electronic states are strongly confined within individual 2D layers. This effect is manifested in the relaxation dynamics of hot carriers in ultrafast time-resolved terahertz spectroscopy. We develop a theory of interlayer Coulomb coupling containing no free parameters that accounts for the experimentally observed trends in hot-carrier dynamics as temperature and the number of layers is varied.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
Air Force Office of Scientific Research (AFSOR); EC Graphene Flagship Program; European Commission; National Science Foundation (NSF); Progetti Premiali 2012; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Welch Foundation
Grant/Contract Number:
FG03-02ER45958
OSTI ID:
1624000
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Booming Development of Group IV–VI Semiconductors: Fresh Blood of 2D Family journal June 2016
Out-of-plane heat transfer in van der Waals stacks through electron–hyperbolic phonon coupling journal November 2017
Time‐Resolved Terahertz Spectroscopy Studies on 2D Van der Waals Materials journal August 2019
Microscopic origins of the terahertz carrier relaxation and cooling dynamics in graphene journal May 2016
A graphene Zener–Klein transistor cooled by a hyperbolic substrate journal November 2017
Auger recombination in Dirac materials: A tangle of many-body effects journal May 2018
Slow Noncollinear Coulomb Scattering in the Vicinity of the Dirac Point in Graphene journal August 2016
Out-of-plane heat transfer in van der Waals stacks through electron-hyperbolic phonon coupling. text January 2018
A graphene Zener-Klein transistor cooled by a hyperbolic substrate text January 2017
Out-of-plane heat transfer in van der Waals stacks: electron-hyperbolic phonon coupling text January 2017

Figures / Tables (5)