Ac-cotunneling through an interacting quantum dot under a magnetic field

We analyze inelastic cotunneling through an interacting quantum dot subject to an ambient magnetic field in the weak tunneling regime under a non-adiabatic time-dependent bias-voltage. Our results clearly exhibit photon-assisted satellites and an overall suppression of differential conductance with increasing driving amplitude, which is consistent with experiments. We also predict a zero-anomaly in differential conductance under an appropriate driving frequency.Comment: Phys. Lett. A (in press

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

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 z0 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. © 1998 Elsevier Science Ltd

Nonlocal dielectric response of an N-quantum-well superlattice embedded in bulk and semi-infinite plasmas in magnetic field

International Conference on Superlattices, Nano-structures and Nano-devices, ICSNN-2006 -- 30 July 2006 through 4 August 2006 -- Istanbul -- 72953We derive explicit analytic results for the dynamic, nonlocal and inhomogeneous screening functions of a finite superlattice array of N equally spaced 2D quantum well plasmas embedded in infinite and semi infinite host bulk-plasma-like media. The closed-form results presented here for the screening functions, which are space-time matrix inverses of the spatially inhomogeneous dielectric functions, are valid for any number of wells, and can accomodate nonlocality in both the 2D and host plasmas, as well as an ambient normal magnetic field. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA