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We developed a novel optical defocusing method for studying spatial coherence of photoexcited electrons and holes near edges of graphene. Our method is applied to measure the localization lD of the disorder-induced Raman D band (∼1350 cm-1) with a resolution of a few nanometers. Raman scattering experiments performed in a helium bath cryostat reveal that as temperature is decreased from 300 to 1.55 K, the length lD increases. We found that the localization of the D band varies as 1/T1/2, giving strong evidence that lD scales with the coherence |
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