Double quantum dot photoluminescence mediated by incoherent reversible energy transport

Abstract

We present a theoretical study of the stationary photoluminescence of two, direct-gap, semiconductor nanocrystals, taking into account electronic excitation energy-transfer processes due to electrostatic interaction. The results obtained here allow for the incoherent reversible energy transport that occurs when the intraband relaxation rate in a quantum dot acceptor is comparable to, or less than, the energy-transfer rate. We investigate the secondary emission of two different electronic level schemes that can be realized experimentally, obtain analytical expressions for the luminescence differential cross section, and perform an analysis of its spectrum. It is shown that when excitation is not in resonance with the levels involved in energy transfer, the energy transfer is more efficient.

Transient pump-probe absorption spectroscopy of semiconductor nanodumbbells

“…2(b). Much like in quantum-dot molecules, 47,48 the coupling between the electronic subsystems of the quantum dots and nanorod is relatively weak as it is caused by the nonradiative transfer of electronic excitation energy through the barriers. This allows one to calculate the energy spectra and wave functions of the nanodumbbell elements separately.…”

“…These include the photon-assisted relaxation, 31-37 the relaxation on [43][44][45] Auger processes, 46 and various kinds of nonradiative energy transfer. 47,48 In this work, we develop a unified theory of transient pump-probe absorption spectroscopy of a semiconductor nanodumbbell. The absorption of the probe pulse induced by the pump pulse resonant to a certain interband transition of the nanodumbbell is treated using the density matrix formalism.…”

Theory of quasi-elastic secondary emission from a quantum dot in the regime of vibrational resonance

“…Following Ref. [46], we take the filtering properties of the detector to be identical to those of a Fabry-Perot interferometer characterized by the function…”

Electron-electron scattering in a double quantum dot: Effective mass approach

“…We also show that when the values of the dielectric constants of the QDs and the matrix are close enough, the screening of dipole-dipole and dipole-multipole interactions between two spherical QDs can be approximated by the same dielectric constant, as it has been done in our previous work. 6,11 To simplify the expression for the matrix element of the interaction potential, we start from the Fourier expansion…”