Correlation induced phonon softening in low density coupled bilayer systems
arXiv:cond-mat/0012482 · doi:10.1103/PhysRevB.63.233201
Abstract
We predict a possible phonon softening instability in strongly correlated coupled semiconductor bilayer systems. By studying the plasmon-phonon coupling in coupled bilayer structures, we find that the renormalized acoustic phonon frequency may be softened at a finite wave vector due to many-body local field corrections, particularly in low density systems where correlation effects are strong. We discuss experimental possibilities to search for this predicted phonon softening phenomenon.
4 pages with 2 figures