Abstract
Electron scattering in the monolayer graphene with short-range impurities modelled by the annular well with a band-asymmetric potential has been considered. Band-asymmetry of the potential resulted in the mass (gap) perturbation in the Dirac equation. Exact explicit formulae for the scattering matrix have been derived. The results are presented in terms of the scattering phases and in the geometrical form of a relation between some 2-vectors. The characteristic equation is obtained. It has a form of the orthogonality condition. An approximate calculation of observables in terms the scattering theory results is outlined.
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