  Crystal-phase low-dimensional structures offer great potential for the
implementation of photonic devices of interest for quantum information
processing. In this context, unveiling the fundamental parameters of the
crystal phase structure is of much relevance for several applications. Here, we
report on the anisotropy of the g-factor tensor and diamagnetic coefficient in
wurtzite/zincblende (WZ/ZB) crystal-phase quantum dots (QDs) realized in single
InP nanowires. The WZ and ZB alternating axial sections in the NWs are
identified by high-angle annular dark-field scanning transmission electron
microscopy. The electron (hole) g-factor tensor and the exciton diamagnetic
coefficients in WZ/ZB crystal-phase QDs are determined through
micro-photoluminescence measurements at low temperature (4.2 K) with different
magnetic field configurations, and rationalized by invoking the spin-correlated
orbital current model. Our work provides key parameters for band gap
engineering and spin states control in crystal-phase low-dimensional structures
in nanowires.
