Nanoelectronic Modeling Lecture 33: Alloy Disorder in Bulk - Part 1/4

This presentation discusses disorder in AlGaAs unstrained systems in bulk.

Bandstructure of an ideal simple unit cell
What happens when there is disorder?
Concept of a supercell
Band folding in a supercell
Band extraction from the concept of approximate bandstructure
Comparison of alloy disorder with the virtual crystal approximation
Configuration noise, concentration noise
How large does an alloy supercell have to be? When does the "bulk" condition occur?
Learning Objectives:

Bandedges and bandgaps are influenced by:
Placement / configuration disorder
Concentration noise
Clustering
System size is very important
"bulk" starts at 100,000 atoms
- Nanostructures are not "bulk"
- like quantum dots, nanowires, and quantum wells vary locally


On nanoHUB: http://nanohub.org/resources/9278

Category:

Science & Technology

Tags:

• Gerhard Klimeck