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Phys. Rev. Lett. 98, 236801 (2007) [4 pages]

Collective Excitations in Electron-Hole Bilayers

G. J. Kalman,1 P. Hartmann,2 Z. Donkó,2 and K. I. Golden3
1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
2Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
3Department of Mathematics and Statistics and Department of Physics, University of Vermont, Burlington, Vermont 05401, USA

Received 1 November 2006; published 5 June 2007

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.

©2007 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.98.236801
DOI: 10.1103/PhysRevLett.98.236801
PACS: 73.20.Mf; 52.27.Gr; 52.65.Yy; 73.21.-b
  • 73.20.Mf
    Collective excitations (surface/interface states) including excitons, polarons, plasmons and other charge-density excitations
  • 52.27.Gr
    Strongly-coupled plasmas
  • 52.65.Yy
    Molecular dynamics methods (plasma simulation)
  • 73.21.-b
    Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
  • YEAR: 2007

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