Low-frequency acoustic phonon temperature distribution in electrically biased graphene.
On the basis of scanning thermal microscopy (SThM) measurements in contact and lift modes, the low-frequency acoustic phonon temperature in electrically biased, 6.7-9.7 μm long graphene channels is found to be in equilibrium with the anharmonic scattering temperature determined from the Raman 2D peak position. With ∼100 nm scale spatial resolution, the SThM reveals the shifting of local hot spots corresponding to low-carrier concentration regions with the bias and gate voltages in these much shorter samples than those exhibiting similar behaviors in the infrared emission maps.
Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States.
Insun
I
Jo
I-Kai
IK
Hsu
Yong J
YJ
Lee
Mir Mohammad
MM
Sadeghi
Seyoung
S
Kim
Stephen
S
Cronin
Emanuel
E
Tutuc
Sanjay K
SK
Banerjee
Zhen
Z
Yao
Li
L
Shi