Terahertz Radiation Emission by Hot Electrons from AlGaN/GaN Heterostructure

In the present paper we report on the observation and study of intense spontaneous THz emission from modulation-doped AlGaN/GaN heterostructure under conditions of heating of two-dimensional electron gas in lateral electric field.The experimental results are compared with the model of blackbody-like thermal emission of hot 2D electrons.Complementary transport measurements and theoretical simulation were carried out to determine the dependence of effective electron temperature on electric field.The role of non-equilibrium optical phonon accumulation is discussed.