Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires
g-factor tensor, diamagnetic coefficient, crystal-phase quantum dot, InP NWs
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.
Tsinghua University Press
Shiyao Wu,Kai Peng,Sergio Battiato,Valentina Zannier,Andrea Bertoni,Guido Goldoni,Xin Xie,Jingnan Yang,Shan Xiao,Chenjiang Qian,Feilong Song,Sibai Sun,Jianchen Dang,Yang Yu,Fabio Beltram,Lucia Sorba,Ang Li,Bei-bei Li,Francesco Rossella,Xiulai Xu, Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires. NanoRes.2019, 12(11): 2842–2848