Collective excitations in electron-hole bilayers

Abstract

We report a combined analytic and Molecular Dynamics analysis of the collective mode spectrum of an electron-hole (bipolar) bilayer in the strong coupling quasi-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; the in-phase spectra exhibit a correlation governed acoustic dispersion for the longitudinal and transverse modes. Strong nonlinear generation of higher harmonics of the fundamental dipole oscillation frequency and the transfer of harmonics between different modes is observed. The mode dispersions in the liquid state are compared with the phonon spectrum in the crystalline solid phase, reinforcing a coherent physical picture.

4 pages, 5 figures

References in corpus (4)

• Excitonic condensation in a symmetric electron-hole bilayer
• Wigner supersolid of excitons in electron-hole bilayers
• Collective Modes in Strongly Coupled Elecronic Bilayer Liquids
• Dielectric matrix and plasmon dispersion in strongly coupled electronic bilayer liquids

Cited by in corpus (7)

• Berezinskii-Kosterlitz-Thouless transition in two-dimensional dipole systems
• Collective dynamics of complex plasma bilayers
• Dynamics of two-dimensional dipole systems
• Structure and melting behavior of classical bilayer crystals of dipoles
• On the Coulomb-dipole transition in mesoscopic classical and quantum electron-hole bilayers
• Acoustic dispersion in a two-dimensional dipole system
• Nonequilibrium Green's function approach to the pair distribution function of quantum many-body systems out of equilibrium