Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-02
Nature Nanotech. 5, 497-501 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted in principle at Nature Nanotechnology
Scientific paper
10.1038/nnano.2010.90
Graphene is a 2-dimensional material with high carrier mobility and thermal conductivity, suitable for high-speed electronics. Conduction and valence bands touch at the Dirac point. The absorptivity of single-layer graphene is 2.3%, nearly independent of wavelength. Here we investigate the thermal radiation from biased graphene transistors. We find that the emission spectrum of single-layer graphene follows that of a grey body with constant emissivity (1.6 \pm 0.8)%. Most importantly, we can extract the temperature distribution in the ambipolar graphene channel, as confirmed by Stokes/anti-Stokes measurements. The biased graphene exhibits a temperature maximum whose location can be controlled by the gate voltage. We show that this peak in temperature reveals the spatial location of the minimum in carrier density, i.e. the Dirac point.
Avouris Phaedon
Chiu Hsin-Ying
Freitag Marcus
Perebeinos Vasili
Steiner Mathias
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