Phase-sensitive magnetoresistance oscillations induced by commensurate bichromatic irradiations in 2D electron systems

We analyze a novel, phase-sensitive contribution to the oscillating magnetoresistance induced by the combined driving of two radiation fields having commensurate frequencies ω₁ and ω₂. This commensurate oscillating photoresistance not only depends on the frequencies and polarizations of both electromagnetic waves, but varies drastically when changing the relative phase of two incident radiation fields. It shows up most significantly in the case of ω₂/ω₁ = 3 and may lead to a phase-controllable change of more than a factor of two in the total magnetoresistivity in the vicinity of ω₁/ω_c = 1.5 and 2.5 (ω_c is the cyclotron frequency), when both radiation fields are linearly x-direction polarized.