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The Magnetic Field Effects on Spin Polarization of T-Shaped Double Quantum Dots Coupled to Ferromagnetic Leads

100%
Wójcik K., Weymann I.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
222-224
EN
We analyze the spin-dependent conductance and spin polarization of a double quantum dot in a T-shape configuration coupled to ferromagnetic leads in the presence of external magnetic field. The calculations are performed with the aid of the numerical renormalization group method. We show that in the antiparallel configuration, finite magnetic field can give rise to the full spin polarization of the current, which can be controlled by tuning the dots' levels. On the other hand, for parallel configuration enhanced spin polarization can be generated by an exchange field due to the presence of ferromagnetic leads and can be also tuned by changing level position or external magnetic field. The magnetic field can be thus used to improve the spin-resolved properties of the system.
2
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Quantized Absorption Strength of Multi-Exciton Quantum Dots

81%
Wójcik K., Grodecka A., Wójs A.
Acta Physica Polonica A
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2006
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vol. 110
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issue 3
423-428
EN
Energy and absorption/recombination spectra of up to two electron-hole pairs confined in a spherical quantum dot are studied numerically as a function of dot radius (i.e., confinement volume). The transition between fermionic and bosonic behavior of the confined excitons is identified in coincidence with enhancement of low-energy absorption strength.
3
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Trion Binding Energies and Wave Functions in Doped Quantum Wells

81%
Gładysiewicz A., Wójcik K., Wójs A., Quinn J.
Acta Physica Polonica A
|
2005
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vol. 108
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issue 4
669-674
EN
The energy spectra of negative trions (X^-=2e+h) in one-sided doped GaAs quantum wells are calculated. The maps of the trion binding energyΔ as a function of well width w, electron concentration n, and the magnetic field B are obtained. The dependence of the trion ground state ("bright singlet" versus "dark triplet") on those parameters is established.
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