Collective Excitations in Electron-Hole Bilayers

Journal Article · Fri Jun 08 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.236801· OSTI ID:20951473

Kalman, G J ^[1]; Hartmann, P; Donko, Z ^[2]; Golden, K I ^[3]

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1. Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467 (United States)
2. Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest (Hungary)
3. Department of Mathematics and Statistics and Department of Physics, University of Vermont, Burlington, Vermont 05401 (United States)

We report a combined analytic and molecular dynamics analysis of the collective mode spectrum of a bipolar (electron-hole) bilayer in the strong coupling classical limit. A robust, isotropic energy gap is identified in the out-of-phase spectra, generated by the combined effect of correlations and of the excitation of the bound dipoles. In the in-phase spectra we identify longitudinal and transverse acoustic modes wholly maintained by correlations. Strong nonlinear generation of higher harmonics of the fundamental dipole oscillation frequency and the transfer of harmonics between different modes is observed.

• OSTI ID: 20951473
• Journal Information: Physical Review Letters, Vol. 98, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.98.236801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLLECTIVE EXCITATIONS
CORRELATIONS
DIPOLES
ENERGY GAP
HARMONICS
HOLES
LAYERS
MOLECULAR DYNAMICS METHOD
NONLINEAR PROBLEMS
SPECTRA
STRONG-COUPLING MODEL