  The degeneracy and spatial support of pseudo-Landau levels (pLLs) in strained
honeycomb lattices systematically depends on the geometry -- for instance, in
hexagonal and rectangular flakes the 0th pLL displays a twofold increased
degeneracy, while the characteristic sublattice polarization of the 0th pLL is
only fully realized in a zigzag-terminated triangle. These features are
dictated by algebraic constraints in the atomistic theory, and signify a
departure from the standard picture in which all qualitative differences
between pLLs and Landau levels induced by a magnetic field trace back to the
valley-antisymmetry of the pseudomagnetic field.
