Raman scattering study of the plasmon modes in bilayer systems

✍ Scribed by D.S. Kainth; D. Richards; H.P. Hughes; M.Y. Simmons; D.A. Ritchie

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 119 KB
• Volume: 2
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(98)00170-2

✦ Synopsis

We report Raman scattering measurements of the acoustic and optic plasmons in electron bilayer systems consisting of two modulation-doped GaAs quantum wells. The measured dispersion relations are successfully fitted using the RPA, with self-consistent wave functions for the quantum well structures and the electron number densities in the wells as fitting parameters. Measurements of the temperature-dependent Landau damping of the acoustic plasmon are compared with the results of RPA calculations including a 0 K Hubbard correction; good agreement was obtained only for low temperatures (¹(¹ $ /2), indicating the need for further theoretical work on local field corrections at higher temperatures.