Quantum-mechanical analysis of far-infrared laser oscillation in p-type germamium

Recent theoretical and experimental achievements on far-infrared (FIR) laser oscillation in p-Ge are reported. The experimentally observed cyclotron-resonance and inter-valence band laser oscillations are explained by theories. The Luttinger Hamiltonian describing the valence bands in the presence of crossed electric and magnetic fields are solved and the distribution functions of holes are derived to evaluate (negative) absorption coefficients in the FIR-range. Experimental results studying the influence of uniaxial stress on the oscillations are also presented and compared with the theory.