1995/08/02 by Tigran V. Shahbazyan, T. V. Shahbazyan, M. E. Raikh +1 · 1 citation
Engineering · Physics and Astronomy · #Condensed matter physics #Conductivity #Coulomb #Electron #Physics #Plasmon #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor materials and devices #Surface and Thin Film Phenomena #Surface plasmon #cond-mat
paper · pdf · doi:10.1103/physrevb.53.7299
published as Phys. Rev. B 53, 7299 (1996) · latex 22 pages + 2 uuencoded figures
arxiv created 1995/08/02 · openalex publication_date 1996/03/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the effect of interactions on the zero-temperature ac conductivity of a two-dimensional Anderson insulator at low frequencies. We show that the enhancement of the real part of conductivity due to the Coulomb correlations in the occupation numbers of localized states results in the change of the sign of the imaginary part within a certain frequency range. As a result, the propagation of a surface plasmon in a localized system becomes possible. We analyze the dispersion law of the plasmon for the two cases: unscreened Coulomb interactions and the interactions screened by a gate electrode spaced by some distance from the electron plane. \textcopyright 1996 The American Physical Society.