Breakdown of the Law of Reflection at a Disordered Graphene Edge
E. Walter (Ludwig Maximilians University, JARA-FIT Institute for Quantum Information)
T. O. Rosdahl (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group, TU Delft - QRD/Wimmer Group)
A. R. Akhmerov (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
F. Hassler (RWTH Aachen University)
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Abstract
The law of reflection states that smooth surfaces reflect waves specularly, thereby acting as a mirror. This law is insensitive to disorder as long as its length scale is smaller than the wavelength. Monolayer graphene exhibits a linear dispersion at low energies and consequently a diverging Fermi wavelength. We present proof that for a disordered graphene boundary, resonant scattering off disordered edge modes results in diffusive electron reflection even when the electron wavelength is much longer than the disorder correlation length. Using numerical quantum transport simulations, we demonstrate that this phenomenon can be observed as a nonlocal conductance dip in a magnetic focusing experiment.