Lattice polarization effects on electron-gas charge densities in ionic superlattices
Materials Science
2007-05-23 v2
Abstract
The atomic-level control achievable in artificially-structured oxide superlattices provides a unique opportunity to explore interface phases of matter including high-density 2D electron gases. Electronic-structure calculations show that the charge distribution of the 2D gas is strongly modulated by electron-phonon interactions with significant ionic polarization. Anharmonic finite-temperature effects must be included to reproduce experiment. Density functional perturbation theory is used to parameterize a simple model introduced to represent these effects and predict temperature dependencies.
Keywords
Cite
@article{arxiv.cond-mat/0602045,
title = {Lattice polarization effects on electron-gas charge densities in ionic superlattices},
author = {D. R. Hamann and D. A. Muller and H. Y. Hwang},
journal= {arXiv preprint arXiv:cond-mat/0602045},
year = {2007}
}
Comments
16 pages including figures Added references 5 and 24, structure picture to Fig. 4, and new paragraph at end of Sec. III