Contactless heating of two-dimensional electron gas systems by strip-line guided microwaves

A practical contactless method for the determination of electrical transpor t properties of heated two-dimensional electron gas (2DEG) systems is prese nted. The transport parameters have been obtained from Shubnikov-de-Haas (S dH) oscillations of the conductivity derived from the absorption of microwa ves. The microwave electric field was guided in a coplanar strip-line on to p of the sample and was attenuated by the transport electrons of the 2DEG. Heating of the electrons could be achieved by increasing the microwave powe r. The electron temperature T-e was determined from the amplitude of the Sd H oscillations. The variation of the absorbed power Q with the electron tem perature T-e follows a dependence Q proportional to T-e(5) - T-L(5) with T- L being the lattice temperature.