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High-resolution spatial mapping of the temperature distribution of a Joule self-heated graphene nanoribbon
Young-Jun Yu, Melinda Y. Han, Stephane Berciaud +5
We investigate the temperature distributions of Joule self-heated graphene nanoribbons (GNRs) with a spatial resolution finer than 100 nm by scanning thermal microscopy (SThM). The…
Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene
Zhiqiang Li, Chun Hung Lui, Emmanuele Cappelluti +5
The in-plane optical phonons around 200 meV in few-layer graphene are investigated utilizing infrared absorption spectroscopy. The phonon spectra exhibit unusual asymmetric feature…
Visualizing Individual Nitrogen Dopants in Monolayer Graphene
Liuyan Zhao, Rui He, Kwang Taeg Rim +15
In monolayer graphene, substitutional doping during growth can be used to alter its electronic properties. We used scanning tunneling microscopy (STM), Raman spectroscopy, x-ray sp…
Temperature dependence of the anharmonic decay of optical phonons in carbon nanotubes and graphite
Ioannis Chatzakis, Hugen Yan, Daohua Song +2
We report on the temperature dependence of the anharmonic decay rate of zone-center (G mode) optical phonons in both single-walled carbon nanotubes and graphite. The measurements a…
Observation of an electrically tunable band gap in trilayer graphene
Chun Hung Lui, Zhiqiang Li, Kin Fai Mak +2
A striking feature of bilayer graphene is the induction of a significant band gap in the electronic states by the application of a perpendicular electric field. Thicker graphene la…
Observation of Intra- and Inter-band Transitions in the Optical Response of Graphene
Leandro M. Malard, Kin Fai Mak, A. H. Castro Neto +2
The optical conductivity of freely suspended graphene was examined under non-equilibrium conditions using femtosecond pump-probe spectroscopy. We observed a conductivity transient…