Publikation: Interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in semiconductor quantum dots
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We theoretically study the interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in two-electron semiconductor double quantum dots near the singlet-triplet (S−T+) anticrossing. The goal of the scheme under study is to extend the singlet-triplet (S−T0) qubit decoherence time T∗2 by dynamically transferring the polarization from the electron spins to the nuclear spins. This polarization transfer is achieved by cycling the electron spins over the S−T+ anticrossing. Here, we investigate, both quantitatively and qualitatively, how this hyperfine-mediated dynamical polarization transfer is influenced by the Rashba and Dresselhaus spin-orbit interaction. In addition to T∗2, we determine the singlet return probability Ps, a quantity that can be measured in experiments. Our results suggest that the spin-orbit interaction establishes a mechanism that can polarize the nuclear spins in the direction opposite to that of hyperfine-mediated nuclear spin polarization. In materials with relatively strong spin-orbit coupling, this interplay of spin-orbit and hyperfine-mediated nuclear spin polarizations prevents any notable increase in the S−T0 qubit decoherence time T∗2.
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RANCIC, Marko J., Guido BURKARD, 2014. Interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in semiconductor quantum dots. In: Physical Review B. 2014, 90(24), 245305. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.90.245305BibTex
@article{Rancic2014Inter-32334,
year={2014},
doi={10.1103/PhysRevB.90.245305},
title={Interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in semiconductor quantum dots},
number={24},
volume={90},
issn={1098-0121},
journal={Physical Review B},
author={Rancic, Marko J. and Burkard, Guido},
note={Article Number: 245305}
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<dcterms:abstract xml:lang="eng">We theoretically study the interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in two-electron semiconductor double quantum dots near the singlet-triplet (S−T+) anticrossing. The goal of the scheme under study is to extend the singlet-triplet (S−T0) qubit decoherence time T∗2 by dynamically transferring the polarization from the electron spins to the nuclear spins. This polarization transfer is achieved by cycling the electron spins over the S−T+ anticrossing. Here, we investigate, both quantitatively and qualitatively, how this hyperfine-mediated dynamical polarization transfer is influenced by the Rashba and Dresselhaus spin-orbit interaction. In addition to T∗2, we determine the singlet return probability Ps, a quantity that can be measured in experiments. Our results suggest that the spin-orbit interaction establishes a mechanism that can polarize the nuclear spins in the direction opposite to that of hyperfine-mediated nuclear spin polarization. In materials with relatively strong spin-orbit coupling, this interplay of spin-orbit and hyperfine-mediated nuclear spin polarizations prevents any notable increase in the S−T0 qubit decoherence time T∗2.</dcterms:abstract>
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