Abstract
We study the conductivity of a two-dimensional electron gas in modulation-doped n-type quantum well heterostructures. We find that the nature of the electrical conduction in the channel is band-like or hopping-like depending on N content, carrier concentration, and temperature. We show that when there is a sufficient carrier concentration in the channel, the conduction occurs through the extended conduction band states of In this band conduction regime the electron mobility is shown to be limited by electron scattering by nitrogen atoms. This mechanism dominates over inelastic collisions by phonons even at room temperature.
- Received 3 December 2003
DOI:https://doi.org/10.1103/PhysRevB.69.153305
©2004 American Physical Society