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We demonstrate direct measurements of the spin-orbit interaction and Land\'eg factors in a semiconductor nanowire double quantum dot. The device is madefrom a single-crystal pure-phase InAs nanowire on top of an array of fingergates on a Si/SiO$_2$ substrate and the measurements are performed in the Paulispin-blockade regime. It is found that the double quantum dot exhibits a largesinglet-triplet energy splitting of $\Delta_{ST}\sim 2.3$ meV, a strongspin-orbit interaction of $\Delta_{SO}\sim 140$ $\mu$eV, and a large andstrongly level-dependent Land\'e g factor of $\sim 12.5$. These results implythat single-crystal pure-phase InAs nanowires are desired semiconductornanostructures for applications in quantum information technologies.

Measurements of the spin-orbit interaction and Land\'e g factor in a pure-phase InAs nanowire double quantum dot in the Pauli spin-blockade regime