Yuksel Ayaz

Interface effects on the dielectric response of a multiple-quantum-wire lattice and current-driven plasmon instability

We have determined the nonlocal, dynamic dielectric response properties of a multiple-quantum-wire lattice embedded in a semi-infinite plasma-like host medium, with the progression of parallel wires perpendicular to the interface, while the wires themselves are parallel to the surface. This is carried out within the framework of the random phase approximation, neglecting tunnelling. In this study, we have also investigated the condition for the occurrence of current-driven plasmon instability as a function of z0, the distance of the first quantum wire from the bounding surface, and as a function of a, the separation of the quantum wires. Furthermore, the coupled mode dispersion relations for the plasmons of multiple-quantum-wire systems in interaction with the surface and bulk plasmons of the host material are analysed for dependences on the geometrical parameters z0 and a.

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

Abstract We 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 z0, 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 z0 is exhibited.

Green function study of the non-stationary polaritonic response of a two-dimensional excitonic layer

A non-stationary process of the polariton-mode excitation in a semiconductor two-dimensional excitonic layer by a short current pulse is studied using the dyadic Green function formalism. The electromagnetic response reveals the exciton-polariton modes corresponding to the poles of the Green function. . Zelyonaya 38,410019, Saratov, Russia

Response dynamics of 1D plasmons coupled to nonlocal bulk plasmons of a host semiconductor

Abstract We have carried out an explicit closed-form determination of the inverse dielectric function for a single one-dimensional (1D) quantum wire embedded in a nonlocal 3D bulk semiconductor plasma and analyzed the coupled mode plasmon dispersion relation in the hydrodynamic model. Our analysis shows that the coupled 1D–3D plasmon is damped due to even small nonlocality of the 3D plasma. Also, there is a new nonlocal low frequency mode which does not exist for either the quantum wire or the nonlocal host in the absence of the other.

Response dynamics of 2D plasmons coupled with optical phonons in bulk and near an interface

Abstract We analyze both the local and nonlocal coupled mode dispersion relations for a degenerate 2D plasma interacting with both surface and bulk optical phonons. The coupled collective modes and their nonlocal shifts, are exhibited as functions of the distance z 0 of the 2D plasma sheet from the bounding surface of the host material. We also explicitly determine the excitation amplitudes (oscillator strengths) of the modes.