Current Scaling and Dirac Fermion Heating in Multi-Layer Graphene.
We have performed transport measurements on a multi-layer graphene device fabricated by conventional mechanical exfoliation. By using the zero-field resistance of our graphene device as a self-thermometer, we are able to determine the effective Dirac fermion temperature TDF at various driving currents I while keeping the lattice constant fixed. Interesting, it is found that TDF is proportional to Ia where a ~ 1. According to theoretical and experimental studies, the exponent a is given by 2/(2+p) where the charge-phonon scattering rate 1/τph is proportional to TP. Therefore our results yield p ~ 0, suggesting that there is little Dirac fermion-phonon scattering, a great advantage for applications in nanoelectronics.
Chiashain
C
Chuang
Tak-Pong
TP
Woo
Akram M
AM
Mahjoub
Takahiro
T
Ouchi
Chang-Shun
CS
Hsu
Chia-Pei
CP
Chin
Nobuyuki
N
Aoki
Li-Hung
LH
Lin
Yuichi
Y
Ochiai
Chi-Te
CT
Liangl