ELECTRON HIGH-FIELD TRANSPORT IN MULTISUBBAND QUANTUM WIRE STRUCTURES

The Monte Carlo simulation of electron transport in multisubband quasi -one-dimensional GaAs/AlAs quantum wires (QWIS) are presented. The ele ctron intrasubband and intersubband scattering by surface-optical and confined longitudinal-optical phonons in QWIS has been included in the program. It is demonstrated that at room temperature the electron dri ft velocity in the QWI is suppressed by electron intersubband scatteri ng and does not exceed the bulk material values. The energy dependence of the total scattering rate in ideal QWIS exhibits multiple sharp pe aks related to intersubband transitions. The scattering rates in the r eal QWIS with variable thicknesses are calculated as well. The results show that even small variation in thickness leads to a significant br oadening of the very first peaks and complete washing-out of the peak- like structure at higher energies.