Abstract
We study the scattering of Dirac electrons in circular graphene quantum dots with two different gaps subject to an electrostatic potential. The obtained solutions of the energy spectrum are used to determine the scattering coefficients at the interface of the two regions. Using the asymptotic solutions at large arguments, we explicitly determine the radial component of the reflected current density and the scattering efficiency. It is found that the presence of a mass term outside, in addition to another one inside the quantum dot, strongly affects the scattering of electrons. In particular, a non-null square modulus of the scattering coefficient is found at zero energy.
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