original_query: What is the technique used to measure the mobility in this context?
query: What techniques are used to measure semiconductor mobility?
answer: Semiconductor mobility is most commonly measured using the Hall effect, resulting in "Hall mobility".  Other techniques include field-effect measurements using a field-effect transistor (FET), resulting in "field-effect mobility",  optical mobility measurements using laser photo-reflectance, terahertz mobility measurements using time-resolved terahertz probes, and time-resolved microwave conductivity (TRMC).