Shubnikov–de Haas-like oscillations in millimeterwave photoconductivity in a high-mobility two-dimensional electron gas

Millimeterwave photoconductivity in a high-mobility GaAs-AlₗGa₁-ₗAs two-dimensional electron gas exhibits giant amplitude oscillations in a weak magnetic field. These oscillations resemble the Shubnikov--de Haas effect but their period is determined by /₂, where and ₂ are the millimeterwave and cyclotron frequencies, respectively. The major observations can be explained in terms of Landau-level transitions between spatially shifted oscillators. A 2k₅ momentum transfer is accompanying the transition where k₅ is the electron Fermi wave number.