We report on growth of InP-InAs core-shell nanowires and demonstration of the formation of single quantum structures, which show Coulomb blockade effect, over entire lengths of the nanowires. The core-shell nanowires are grown by a selective area growth technique via metal-organic vapor phase epitaxy. The as-grown core-shell nanowires are found to be of wurtzite crystals. The InP cores have a hexagonal cross section, while the InAs shell are grown preferentially on specific {11ˉ00} facets, leading to the formation of the core-shell nanowires with an overall triangular cross section. The grown core-shell nanowires are transferred on to a Si/SiO2 substrate and then contacted with several narrow metal electrodes. Low-temperature transport measurements show the Coulomb-blockade effect. We analyze the measured gate capacitance and single electron charging energy of the devices and demonstrate that a quantum structure which shows the Coulomb blockade effect of a many-electron quantum dot is formed over the full length of a single core-shell nanowire and consists of the entire InAs shell in the nanowire.
@article{arxiv.1901.09645,
title = {Coulomb Blockade from the Shell of an InP-InAs Core-Shell Nanowire with a Triangular Cross Section},
author = {D. J. O. Göransson and M. Heurlin and B. Dalelkhan and S. Abay and M. E. Messing and V. F. Maisi and M. T. Borgström and H. Q. Xu},
journal= {arXiv preprint arXiv:1901.09645},
year = {2019}
}