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Electric Field Control of Magnetic Coupling in a Double Quantum Dot System and Related Parasitic Electric Dipole Effect

100%
Bak Z.
|
|
issue 5
957-958
EN
We prove that tunable magnetic interaction in a two-qubit spintronic device can arise due to the mutual competition of the Ruderman-Kittel-Kasuya-Yosida and double-exchange interactions. The values of induced electric dipoles (which arise when magnetic coupling is manipulated by the electric field) are calculated. We show that the dissipation of the energy during logic operations due to these parasitic dipoles can destroy quantum coherence in any quantum dot system.
2
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Electron Mediated Mn-Mn Interaction in Quantum Dots

100%
Bak Z.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1219-1221
EN
We present a theoretical study of magnetic interaction in quantum dots with magnetic Mn^{2+} in dot impurities. We show that gate voltage applied to the quantum dot shifts the centers of electron clouds. Exact formulae for the perturbed spin density allow us to derive expression for the change of the strength of the sp-d coupling. Estimations show that sp-d exchange integral is very sensitive to the gate voltage variations. Exact formulae for the change of the effective exchange integrals are derived. As the spin coded qubits are elements of the RAM memory, a part of the energy stored in magnetic coupling will be dissipated when information is written or erased. We estimate this energy and find it sufficiently large to destroy quantum coherence during quantum computing. Finally, we discuss the interdot spin coupling and show the effect of gate voltage operations on the spin intra- and interdot Ruderman-Kittel-Kasuya-Yosida coupling.
3
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RKKY Interaction in Coupled Quantum Dots

51%
Bak Z., Jaroszewicz R., Gruhn W.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 1
342-344
EN
Assuming that quantum dots are treated as artificial impurities we consider the Ruderman-Kittel-Kasuya-Yosida interaction between their localized magnetic moments. We prove that due to the quantum confinement the carriers that mediate interactions can exhibit fractional spectral dimension. Basing on this result we discuss magnetic interactions in coupled system of quantum dots and leads.
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