Microwave Rectificatin of the Current at the Metal-Metal Junction for Dilute 2D Metals

Within a quasiclassical transport theory for 2D electron system we analyze a recently observed effect of microwave rectification at the boundary between two 2D metals of different carrier densities. Nonlinear response is employed to explain the effect. It is shown that the effect of rectification arises due to inhomogeneity of the electron density which breaks space symmetry of the system. The results agree with the above experiments.