TY - JOUR
T1 - Breakdown of the Law of Reflection at a Disordered Graphene Edge
AU - Walter, E.
AU - Rosdahl, T. O.
AU - Akhmerov, A. R.
AU - Hassler, F.
PY - 2018/9/25
Y1 - 2018/9/25
N2 - 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.
AB - 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.
UR - http://resolver.tudelft.nl/uuid:e6f04102-3247-4958-b0bd-068530304a0a
UR - http://www.scopus.com/inward/record.url?scp=85053913468&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.121.136803
DO - 10.1103/PhysRevLett.121.136803
M3 - Article
AN - SCOPUS:85053913468
SN - 0031-9007
VL - 121
JO - Physical Review Letters
JF - Physical Review Letters
IS - 13
M1 - 136803
ER -