Correlation induced phonon softening in low density coupled bilayer systems

Details Correlation induced phonon softening in low density coupled bilayer systems Correlation induced phonon softening in low density coupled bilayer systems

2000-12-27

arxiv.org/abs/cond-mat/0012482v1

Phys. Rev. B 63, 233201 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 2 figures

Scientific paper

10.1103/PhysRevB.63.233201

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.

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