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

Abstract

We demonstrate direct measurements of the spin-orbit interaction and Land\'e g factors in a semiconductor nanowire double quantum dot. The device is made from a single-crystal pure-phase InAs nanowire on top of an array of finger gates on a Si/SiO${}_2$ substrate and the measurements are performed in the Pauli spin-blockade regime. It is found that the double quantum dot exhibits a large singlet-triplet energy splitting of ${\Delta }_{ST}\sim 2.3$ meV, a strong spin-orbit interaction of ${\Delta }_{SO}\sim 140$ $\mu$eV, and a large and strongly level-dependent Land\'e g factor of $\sim 12.5$. These results imply that single-crystal pure-phase InAs nanowires are desired semiconductor nanostructures for applications in quantum information technologies.