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In their recent submission arXiv:1206.3435v1 Zhou and Wu addressed the chargeand spin pumping in an armchair graphene nanoribbon connected to magneticand/or nonmagnetic leads at zero bias. They used thereby a pumping currentformula based on time-reversal symmetry. In their appendix they made, based ontheir formulas, a number of claims concerning our recent works [K. -H. Ding, Z.-G. Zhu, and J. Berakdar, Phys. Rev. B 84, 115433 (2011)] on the lasermodification of the spin-dependent current in an extended graphene monolayercontacted to two magnetic leads under a finite bias. Below we show in detailthat the physical system considered by us is conceptually different from thatof Zhou and Wu (arXiv:1206.3435v1) and cannot be treated with their theory forfundamental reasons (e.g., the time-reversal symmetry is inherently broken inour case due to the presence of the magnetic leads and the dc current generatedby the finite bias). Hence, the statements of Zhou and Wu based on a comparisonof their results with ours are scientifically groundless.

Comment on "Single-parameter quantum charge and spin pumping in armchair graphene nanoribbons" (arXiv:1206.3435v1, by Zhou and Wu)