Hot Electron Cooling by Acoustic Phonons in Graphene

被引：125

作者：

Betz, A. C. ^{[1
,2
]}

Vialla, F. ^{[1
,2
]}

Brunel, D. ^{[1
,2
]}

Voisin, C. ^{[1
,2
]}

Picher, M. ^{[3
]}

Cavanna, A. ^{[3
]}

Madouri, A. ^{[3
]}

Feve, G. ^{[1
,2
]}

Berroir, J. -M. ^{[1
,2
]}

Placais, B. ^{[1
,2
]}

Pallecchi, E. ^{[1
,2
]}

机构：

[1] Univ Paris 06, ENS CNRS, UMR 8551, Lab Pierre Aigrain, F-75231 Paris 05, France

[2] Univ Paris Diderot, F-75231 Paris 05, France

[3] CNRS, UPR20, Lab Photon & Nanostruct, F-91460 Marcoussis, France

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 05期

关键词：

SHOT-NOISE;

D O I：

10.1103/PhysRevLett.109.056805

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the energy loss of hot electrons in metallic graphene by means of GHz noise thermometry at liquid helium temperature. We observe the electronic temperature T proportional to V at low bias in agreement with the heat diffusion to the leads described by the Wiedemann-Franz law. We report on T proportional to root V behavior at high bias, which corresponds to a T-4 dependence of the cooling power. This is the signature of a 2D acoustic phonon cooling mechanism. From a heat equation analysis of the two regimes we extract accurate values of the electron-acoustic phonon coupling constant Sigma in monolayer graphene. Our measurements point to an important effect of lattice disorder in the reduction of Sigma, not yet considered by theory. Moreover, our study provides a strong and firm support to the rising field of graphene bolometric detectors.

引用

页数：5

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