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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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