Physics and simulation of quantum heterostructure devices; Non-linear electro-thermal measurement (DC/RF/microwave and pulsed IV/RF) and modeling of semiconductor devices (e.g., MODFETs, SOI-MOSFET, Thyristors/BJTs and resonant tunneling diodes) and circuits (e.g., active antennas, power RF amplifiers, power switching) for applications in the design of RF/microwave wireless system, and in Smart-power ICs with reduced RFI;