Pressure studies of tunnelling processes in a double-barrier structure with a two-dimensional emitter contact
Resonant tunnelling experiments under hydrostatic pressures up to 15 kbar in a double-barrier structure with a two-dimensional emitter pre-well are reported. At room temperature the structure shows two transitions in its tunnelling characteristics as a function of pressure. The authors associate these transitions with the enhancement of the Gamma -X tunnelling in the collector and emitter barriers. At lower temperatures these features are less pronounced. In addition they estimate the pressure coefficient for the decrease in the energy of the X minimum in relation to the Gamma minimum in Al0.6Ga0.4As.