The electronic properties of a graphene monolayer in a magnetic and a
strain-induced pseudo-magnetic field are studied in the presence of spin-orbit
interactions (SOI) that are artificially enhanced, e.g., by suitable adatom
deposition. For the homogeneous case, we provide analytical results for the
Landau level eigenstates for arbitrary intrinsic and Rashba SOI, including also
the Zeeman field. The edge states in a semi-infinite geometry are studied in
the absence of the Rashba term. For a critical value of the magnetic field, we
find a quantum phase transition separating two phases with spin-filtered
helical edge states at the Dirac point. These phases have opposite spin current
direction. We also discuss strained magnetic waveguides with inhomogeneous
field profiles that allow for chiral snake orbits. Such waveguides are
practically immune to disorder-induced backscattering, and the SOI provides
non-trivial spin texture to these modes.Comment: 12 pages, 7 figures; v2: minor modifications, published versio
