Journal
PHYSICAL REVIEW B
Volume 87, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.115416
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [P10502]
- ARO
- NSF [0726909]
- JSPS-RFBR [12-02-92100]
- MEXT Kakenhi on Quantum Cybernetics
- JSPS via its FIRST Program
- Grants-in-Aid for Scientific Research [22224007, 10F00502, 21102002] Funding Source: KAKEN
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We examine electronic transport in a spin-blockaded double quantum dot. We show that by tuning the strength of the spin-orbit interaction the current flowing through the double dot exhibits a dip at zero magnetic field or a peak at amagnetic field for which the two-electron energy levels anticross. This behavior is due to the dependence of the singlet-triplet mixing on the field and spin-orbit amplitude. We derive approximate expressions for the current as a function of the amplitudes of the states involved in the transport. We also consider an alternative model that takes into account a finite number of nuclear spins and study the resulting coupled dynamics between electron and nuclear spins. We show that if the spin ensemble is in a thermal state there are regular oscillations in the transient current followed by quasichaotic revivals akin to those seen in a thermal Jaynes-Cummings model. DOI: 10.1103/PhysRevB.87.115416
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