Effect of Sparse Doping in Barriers on the Energy Structure of Center-Delta-Doped QW

Effect of sparse (presumably background) shallow donor impurity on the energy structure of SiGe/Si quantum well structure delta-doped to the center of the well is studied numerically. The method includes calculation of impurity binding energy. The proposed nanostructure configuration can be used to create tunable optical devices in THz frequency region. © 2019 IEEE

Impurity binding energy for delta-doped quantum well structures

ABSTRACT: The binding energy of an impurity delta layer situated either in the centre or at the edge of a quantum well (QW) is theoretically considered for the example of n-type Si0⋅8Ge0⋅2/Si/Si0⋅8Ge0⋅2 QW doped with phosphorus. Calculations are made for the case of not so big impurity concentrations, when impurity bands are not yet formed and it is still possible to treat impurity as isolated ones. It is shown on the base of self-consistent solution of Schrödinger, Poisson and electro-neutrality equations that impurity binding energy is dependent on the degree of impurity ionization and the most noticeably for the case of edge-doped QWs

Hydrogenic Impurity States in a Delta-Layer Within Quantum Wells in a Transversal Electric Field

The effect of a transversal electric field on the impurity binding energy and the energy differences between the space-quantized subbands of center delta-doped SiGe/Si quantum well structure is studied numerically with a self-consistent method. The result is explained in terms of the concurrent effects of impurity ionization and the applied field. The predicted phenomenon can be used to tune the energy distances and, accordingly, the working frequencies of possible optical devices. © 2020 IEEE

A Team Based Player Versus Player Recommender Systems Framework For Player Improvement

Modern Massively Multi-player Online Games (MMOGs) have grown to become extremely complex in terms of the usable resources in the games, resulting in an increase in the amount of data collected by tracking the in-game activities of players. This has opened the door for researchers to come up with novel methods to utilize this data to improve and personalize the user experience. In this paper, a novel but flexible framework towards building a team based recommender system for player-versus-player (PvP) content in such MMOGs is presented, and applied to a case study in the context of the major commercial title Destiny 2. The framework combines behavioral profiling via cluster analysis with recommendation systems to look at teams of players as a unit, as well as the individual players, to make recommendations to the players, with the purpose of providing information to them towards improving their performance

Background impurities in Si0.8 Ge0.2/Si/Si0.8 Ge0.2 n-type δ-doped QW

Additional (residual) impurities in the barriers change the energy profile of a quantum well. This means that they alter the ionization energy for the impurity delta layer situated within the quantum well. In turn, this is accompanied by the change of a V-shaped quantum well created by ionization of the delta layer. All of this is the subject of studies presented in this article. It has been shown that the most dramatic are the changes in the difference between the space-quantized energy levels for an edge-doped quantum well. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim