Strain fields in graphene giving rise to pseudomagnetic fields have received
much attention due to the possibility of mimicking real magnetic fields with
magnitudes of greater than 100 Tesla. We examine systems with such strains
confined to finite regions ("pseudomagnetic dots") and provide a transparent
explanation for the characteristic sublattice polarization occurring in the
presence of pseudomagnetic field. In particular, we focus on a triaxial strain
leading to a constant field in the central region of the dot. This field causes
the formation of pseudo Landau levels, where the zeroth order level shows
significant differences compared to the corresponding level in a real magnetic
field. Analytic arguments based on the Dirac model are employed to predict the
sublattice and valley dependencies of the density of states in these systems.
Numerical tight binding calculations of single pseudomagnetic dots in extended
graphene sheets confirm these predictions, and are also used to study the
effect of the rotating the strain direction and varying the size of the
pseudomagnetic dot
