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The Corbino geometry allows one to investigate the propagation of electriccurrent along a p-n interface in ballistic graphene in the absence of edgestates appearing for the familiar Hall-bar geometry. Using the transfer matrixin the angular-momentum space we find that for sufficiently strong magneticfields the current propagates only in one direction, determined by the magneticfield direction and the interface orientation, and the two valleys, K and K',are equally occupied. Spatially-anisotropic effective mass may suppress one ofthe valley currents, selected by the external electric field, transforming thesystem into a mesoscopic version of the valley filter. The filtering mechanismcan be fully understood within the effective Dirac theory, without referring toatomic-scale effects which are significant in proposals operating on localizededge states.

Mesoscopic valley filter in graphene Corbino disk containing a p-n junction