Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-08-09
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
In mesoscopic physics, interference effects play a central role on the transport properties of conduction electrons, giving rise to exotic phenomena such as weak localization, Aharonov-Bohm effect, and universal conduction fluctuations. Mesoscopic objects have a size on the order of the {\em phase-breaking length} $L_{\phi}$, the length conduction electrons travel while keeping phase coherence. In this letter, we use vibrational spectroscopy in combination with a novel optical defocusing method to measure $L_{\phi}$ of photo-excited electrons in graphene which undergo inelastic scattering by optical phonons. We extract $L_{\phi}$ from the spatial confinement of the defect-induced Raman D band near the edges of graphene. Temperature dependent measurements in the range of 1.55\,K to 300\,K yield $L_{\phi} \propto 1/\sqrt{T}$, in agreement with previous magneto-transport measurements.
Beams Ryan
Cançado Luiz Gustavo
Novotny Lukas
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