Highly symmetric and tunable tunnel couplings in InAs/InP nanowire heterostructure quantum dots

Thomas, Frederick S. and Baumgartner, Andreas and Gubser, Lukas and Jünger, Christian and Fülöp, Gergő and Nilsson, Malin and Rossi, Francesca and Zannier, Valentina and Sorba, Lucia and Schönenberger, Christian . (2020) Highly symmetric and tunable tunnel couplings in InAs/InP nanowire heterostructure quantum dots. Nanotechnology, 31 (13). p. 135003.

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Official URL: https://edoc.unibas.ch/80425/

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We present a comprehensive electrical characterization of an InAs/InP nanowire (NW) heterostructure, comprising of two InP barriers forming a quantum dot (QD), two adjacent lead segments and two metallic contacts. We demonstrate how to extract valuable quantitative information of the QD. The QD shows very regular Coulomb blockade resonances over a large gate voltage range. By analyzing the resonance line shapes, we map the evolution of the tunnel couplings from the few to the many electron regime, with electrically tunable tunnel couplings from mu eV to >600 mu eV, and a transition from the temperature to the lifetime broadened regime. The InP segments form tunnel barriers with almost fully symmetric tunnel couplings and a barrier height of similar to 350 meV. All of these findings can be understood in great detail based on the deterministic material composition and geometry. Our results demonstrate that integrated InAs/InP QDs provide a promising platform for electron tunneling spectroscopy in InAs NWs, which can readily be contacted by a variety of superconducting materials to investigate subgap states in proximitized NW regions, or be used to characterize thermoelectric nanoscale devices in the quantum regime.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Thomas, Frederick and Baumgartner, Andreas and Gubser, Lukas and Fülöp, Gergö and Nilsson, Malin
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 13:06
Deposited On:14 Apr 2021 13:06

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