Coulomb blockade from the shell of an InP-InAs core-shell nanowire with a triangular cross section

Summary, in English

We report on growth of InP-InAs core-shell nanowires and demonstration of the formation of single quantum structures, which show the 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 shells are grown preferentially on specific { 1 1 ¯ 00} facets, leading to the formation of the core-shell nanowires with an overall triangular cross section. The grown core-shell nanowires are transferred onto a Si/SiO
₂
substrate and then contacted by 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.

• Author: D. J.O. Göransson; M. Heurlin; B. Dalelkhan; S. Abay; M. E. Messing; V. F. Maisi; M. T. Borgström; H. Q. Xu
• Department/s: NanoLund: Centre for Nanoscience; Solid State Physics
• Publishing year: 2019-02-04
• Language: English
• Publication/Series: Applied Physics Letters
• Volume: 114
• Issue: 5
• Links: http://dx.doi.org/10.1063/1.5084222
• Document type: Journal article
• Publisher: American Institute of Physics (AIP)
• Topic: Nano-technology; Condensed Matter Physics (including Material Physics, Nano Physics)
• Status: Published
• ISBN/ISSN/Other: ISSN: 0003-6951