Type of Publication: | Preprint |
Author: | Rancic, Marko J.; Burkard, Guido |
Year of publication: | 2014 |
ArXiv-ID: | arXiv:1408.6700 |
Summary: |
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 (S) - triplet (T+) anticrossing. The goal of the scheme under study is to extend the singlet (S) - triplet (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 opposite direction compared to 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 of the S−T0 qubit decoherence time T∗2.
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Subject (DDC): | 530 Physics |
Keywords: | Physics, Mesoscopic Systems and Quantum Hall Effect |
Bibliography of Konstanz: | Yes |
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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
@unpublished{Rancic2014Inter-29143, title={Interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in semiconductor quantum dots}, year={2014}, author={Rancic, Marko J. and Burkard, Guido} }
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