We announce the creation of a database of invariant rings. This database contains a large number of invariant rings of finite groups, mostly in the modular case. It gives information on generators and structural properties of the invariant rings. The main purpose is to provide a tool for researchers in invariant theory.
We perform first-principles density-functional calculations to investigate the electronic and atomic structure and formation energies of native defects and selected impurities ͑O, Si, and Mg͒ in InN. For p-type material, the nitrogen vacancy has the lowest formation energy. In n-type material all defect formation energies are high. We discuss the effect of… (More)