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We study transport properties of an arbitrarily shaped ultraclean graphenesheet, adiabatically connected to leads,composed by the same material. If thelocalized interactions do not destroy chiral symmetry, we show that theconductance is quantized, since it is dominated by the quasi one-dimensionalleads. As an example, we show that smooth structural deformations of thegraphene plane do not modify the conductance quantization.

Universal Landauer conductance in chiral symmetric 2d systems