Shubnikov-de Haas oscillations in microwave-irradiated two-dimensional electron systems*

We have studied Shubnikov-de Haas Oscillations in a high-mobility two-dimensional electron system irradiated by microwave radiation up to 100 GHz. We have found that the amplitude of Shubnikov oscillations is suppressed by microwaves in the vicinity of certain magnetic fields. These fields depend on the microwave frequency indicating resonant response. This talk will discuss frequency, temperature, and power dependences of the phenomenon and compare observations to earlier studies by other experimental groups.