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We theoretically study valley-filtering in pristine graphene irradiated bybicircular counter-rotating laser drive. The dynamical symmetry of the grapheneand laser drive disrupts graphene's inversion symmetry, which results distinctquasi-energy states and Floquet band occupations in the two valleys.Controlling the relative phase between the bicircular laser drive ultimatelyallows to blocks the contribution from one valley while allowing the oppositevalley currents in the system. For practical realization of valley-baseddevice, we propose configurational setup for valley filters and valley valveconsisting of two graphene nanoribbons irradiated by two bicircularcounter-rotating laser drives with a relative phase shift. It is observed thatthe relative phase between the two bicircular laser drives offer a control knobto generate valley-selective currents and transport responses with very highefficiency by an all-optical way. In addition, our findings about valley filterand valley valve are robust against moderate disorder and modest changes indriving laser parameters. Present work opens an avenue to realise light-basedvalleytronics devices in reality.

Valley filtering and valley valves in irradiated pristine graphene