Collective Excitations in a Quasi-Two-Dimensional Electron-Hole Gas

Atwal, G. S., Ashcroft, N (2000) Collective Excitations in a Quasi-Two-Dimensional Electron-Hole Gas. American Physical Society.



Physical confinement of an electron-hole gas in thin metallic films leads to subband structure and other quantum size effects in the electronic properties. Longitudinal and transverse collective excitations (plasmons) in such a quasi-two-dimensional system are initially studied within a hydrodynamic approach and later within the random phase approximation. The evolution of a two-dimensional longitudinal plasmon into both a bulk three-dimensional plasmon and a surface plasmon is analyzed as a function of increasing film thickness. For the single band case the maximum wavevector for the lowest energy longitudinal excitation (before the onset of Landau damping) is shown to exhibit oscillatory behavior as a function of film thickness. Finally, extensions to the case of a periodic arrangement of layers of quasi-two-dimensional systems are also discussed.

Item Type: Book
Subjects: physics
CSHL Authors:
Communities: CSHL labs > Atwal lab
Depositing User: Matt Covey
Date: 2000
Date Deposited: 30 Jan 2015 16:12
Last Modified: 30 Jan 2015 16:12

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