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Accuracy of Effective Mass Equation for a Single and Double Cylindrical Quantum Dot

100%
Mielnik-Pyszczorski A., Gawarecki K., Machnikowski P.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
376-379
EN
In this contribution we study the accuracy of various forms of electron effective mass equation in reproducing spectral and spin-related features of quantum dot systems. We compare the results of the standard 8 band k·p model to those obtained from effective mass equations obtained by perturbative elimination procedures in various approximtions for a cylindrical quantum dot or a system of two such dots. We calculate the splitting of electronic shells, the electron g-factor and spin-orbit induced spin mixing and show that for a cylindrical dot the g-factor is reproduced very exactly, while for the two other quantities the effective mass equation is much less accurate.
2
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The Edelstein Effect in the Presence of Impurity Spin-Orbit Scattering

64%
Maleki Sheikhabadi A., Raimondi R., Shen K.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
135-139
EN
In this paper we study the current-induced spin polarization in a two-dimensional electron gas, known also as the Edelstein effect. Compared to previous treatments, we consider both the Rashba and Dresselhaus spin-orbit interaction as well as the spin-orbit interaction from impurity scattering. In evaluating the Kubo formula for the spin polarization response to an applied electric field, we explicitly take into account the side-jump and skew-scattering effects. We show that the inclusion of side-jump and skew-scattering modifies the expression of the current-induced spin polarization.
3
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Nanoelectromechanics of shuttle devices

52%
Shekhter R. I., Gorelik L. Y., Krive I. V., Kiselev M. N., Parafilo A. V., Jonson M.
Nanoelectromechanical Systems
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2013
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vol. 1
1-25
EN
A single-electron tunneling (SET) device with a nanoscale central island that can move with respect to the bulk sourceand drain electrodes allows for a nanoelectromechanical (NEM) coupling between the electrical current through the device and the mechanical vibrations of the island. Although the electromechanical “shuttle” instability and the associated phenomenon of single-electron shuttling were predicted more than 15 years ago, both theoretical and experimental studies of NEM-SET structures are still carried out. New functionalities based on quantum coherence, Coulomb correlations and coherent electron-spin dynamics are still of particular interest. In this article we present a short review of recent activities in this area.
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