Nonlocality effects of a bulk semiconductor plasma in interaction with quantum well superlattice plasmons

WOS: 000087159100023An explicit closed form determination of the inverse dielectric function for an N-sheet two-dimensional (2D) electron superlattice embedded in a nonlocal bulk host semiconductor plasma is presented here, as well as for an infinite superlattice. The coupled plasmon dispersion relation is analyzed for the model in which the 2D quantum wells constituting the superlattice have just one occupied subband and the bulk plasma of the host has hydrodynamic nonlocality. Nonlocal corrections are obtained for a hybrid superlattice plasmon in interaction with the host bulk plasmon. In addition, we find that this model predicts a new nonlocal low-frequency mode

Dynamic dielectric response of an asymmetric double quantum well near the bounding surface of a semi-infinite dynamic plasmalike host medium

WOS: 000075039700045We have examined the dynamic, nonlocal dielectric response function of a pair of asymmetric quantum wells embedded in a semi-infinite dynamic (local) host plasmalike medium, near its bounding surface, by carrying out a closed form inversion of the dielectric function of this system explicitly. The resulting random-phase-approximation (RPA) inverse dielectric function K(z,z';q,omega), which depends on lateral wave vector q and frequency omega, is obtained analytically in position representation with z,z' describing distances into the medium from the bounding surface. In this, we neglect intersubband transitions in the two quantum wells (assumed to be thin) and ignore tunneling effects. The frequency poles of K(z,z';q, w), describe the collective modes resulting from the coupling of the double quantum well quasi-two-dimensional intrasubband plasmons with the bulk and surface plasmons of the host medium, and the residues at these poles provide the oscillator strengths of such coupled collective modes

Coupling of N-quantum-wire plasmons with surface and bulk collective modes of the host semiconductor

3rd International Conference on Low Dimensional Structures and Devices (LDSD 99) -- SEP 15-17, 1999 -- ANTALYA, TURKEYWOS: 000087431500029We have examined the dynamic dielectric response properties of a multiple quantum-wire system embedded in a semi-infinite plasma-like host medium assuming that each wire has just one active subband. The geometric dependence on z(0), the distance of the first quantum-wire from the bounding surface is determined. In particular, the coupled mode dispersion relation for the plasmons of an N-quantum-wire system in interaction with the surface and bulk plasmons of the host material is analyzed and its dependence on z(0) is exhibited. (C) 2000 Elsevier Science B.V. All rights reserved

Broadband graphene polarizer

10.1038/nphoton.2011.102Nature Photonics57411-41