Non-collinear spin-orbit magnetic fields in a carbon nanotube double quantum dot

Abstract

We demonstrate experimentally that non-collinear intrinsic spin-orbit magnetic fields can be realized in a curved carbon nanotube two-segment device. Each segment, analyzed in the quantum dot regime, shows near four-fold degenerate shell structure allowing for identification of the spin-orbit coupling and the angle between the two segments. Furthermore, we determine the four unique spin directions of the quantum states for specific shells and magnetic fields. This class of quantum dot systems is particularly interesting when combined with induced superconducting correlations as it may facilitate unconventional superconductivity and detection of Cooper pair entanglement. Our device comprises the necessary elements.

Supplemental material available at https://www.dropbox.com/s/ay3edjgg015uzrc/supplement.pdf?dl=1

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Cited by in corpus (8)

• Triplet correlations in Cooper pair splitters realized in a two-dimensional electron gas
• Spin Cross-Correlation Experiments in an Electron Entangler
• Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
• Control of the Two-Electron Exchange Interaction in a Nanowire Double Quantum Dot
• Coulomb-blockade and Pauli-blockade magnetometry
• Nanoscale magnetic resonance spectroscopy using a carbon nanotube double quantum dot
• Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter
• Coupling of shells in a carbon nanotube quantum dot