Onset of optical-phonon cooling in multilayer graphene revealed by RF noise and black-body radiation thermometries

被引：11

作者：

Brunel, D. ^{[1
]}

Berthou, S. ^{[1
]}

Parret, R. ^{[1
]}

Vialla, F. ^{[1
]}

Morfin, P. ^{[1
]}

Wilmart, Q. ^{[1
]}

Feve, G. ^{[1
]}

Berroir, J-M ^{[1
]}

Roussignol, P. ^{[1
]}

Voisin, C. ^{[1
]}

Placais, B. ^{[1
]}

机构：

[1] Univ Paris Diderot, Sorbonne Univ, Univ Paris 06,Sorbonne Paris Cite, Ecole Normale Super,PSL Res Univ,CNRS,Lab Pierre, F-75231 Paris 05, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2015年 / 27卷 / 16期

关键词：

graphene; high-frequency electronics; optics; electron-phonon coupling; noise thermometry;

D O I：

10.1088/0953-8984/27/16/164208

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report on electron cooling power measurements in few-layer graphene excited by Joule heating by means of a new setup combining electrical and optical probes of the electron and phonon baths temperatures. At low bias, noise thermometry allows us to retrieve the well known acoustic phonon cooling regimes below and above the Bloch-Gruneisen temperature, with additional control over the phonon bath temperature. At high electrical bias, we show the relevance of direct optical investigation of the electronic temperature by means of black-body radiation measurements. In this regime, the onset of new efficient relaxation pathways involving optical modes is observed.

引用

页数：7

共 26 条

[1] Electron and Optical Phonon Temperatures in Electrically Biased Graphene [J].