Total Tomography of Nonplanar Heterostructures for Quantum Information Processing

This proposal describes the correlation of the composition, strain, and electronic structure of III-As/Sb heterostructures in three dimensions to understand how interactions between composition and strain influence growth and electronic properties. Substrated-templated nanowire heterostructures grown in network topologies are promising candidates for proposed quantum computing schemes involving Majorana quasiparticles. Atom probe tomography will be used to measure 3-D nanoscale composition fields of III-As/Sb nanowire networks grown by collaborators at the forefront of this field. Based on these composition data, finite element models of relaxed physical structure will provide a foundation for simulations of and correlation with synchrotron-based single nanowire x-ray diffraction and imaging. The combined strain and composition data, including dopant distributions accessible only by atom probe tomography, will be used to develop integrated models of nanostructure growth and electronic properties. Correlated single nanowire cathodoluminesence and Raman spectroscopy, and other correlated measurements with collaborators, will provide spatially resolved measurents of carrier concentrations and strain, respectively. The proposed research leverages recent advances by the principle investigator in integrating nanoscale strain and composition measurements.