Nature Physics
Visualization of charge transport through Landau levels in graphene
Nature Physics · 6, 870-874 (2010)
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Introduction
Spatially resolved photocurrent measurements map charge collection in graphene in the quantum Hall regime. The maps link the signal at the contacts to hot carriers reaching the perimeter, where edge states support their collection.
A closer reading
A net current under uniform illumination can conceal the difference between edge and interior. Scanning the excitation point connects where a signal originates to what a contact collects, without claiming to trace the trajectory of an individual electron.