Quantum transport of a high mobility two dimensional hole gas in a strained Ge quantum well

A high mobility (780,000 cm2/Vs) 2DHG has been created in a strained Ge quantum well structure, through B modulation doping. The mobility and carrier density were measured through Hall effect measurements at temperatures between 0.3 K and 300 K, revealing a low temperature carrier density of 2×1011cm-2. Low temperature magnetoresistance measurements show a complex, multiple frequency oscillatory behavior in the SdH oscillations for this modulation doped quantum well. This may be attributed to oscillations from carriers in other layers in the heterostructure superimposed on the oscillations due to transport in the quantum well, due to parallel conduction.