Phase-Sensitive Magnetoresistance Oscillations Induced By Commensurate Bichromatic Irradiations In A Two-Dimensional Electron System

We analyze a phase-sensitive contribution to the oscillating magnetoresistance induced by the combined driving of two microwave fields having commensurate frequencies omega(1) and omega(2) (m(1)omega(1) + m(2)omega(2) = 0 for at least a set of nonzero integers m(1) and m(2)), based on the balance-equation approach to magnetotransport for high-density two-dimensional electron systems. This commensurate oscillating photoresistance not only depends on the frequencies and polarizations of both microwaves, but varies drastically when changing the relative phases of two incident radiation fields. It shows up most significantly in the case of omega(2)/omega(1) = 3 and may lead to a phase-controllable change of more than a factor of two in the total magnetoresistivity in the vicinity of omega(1)/omega(c) = 1.5 and 2.5 (omega(c) is the cyclotron frequency), when both radiation fields are linearly x-direction polarized. (C) 2014 AIP Publishing LLC.