141 citations · 482 across the 10 of their papers we have counts for
10 papers
Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
Marco Valentini, Fernando Peñaranda, Andrea Hofmann +7
A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstr…
Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
Joost Ridderbos, Matthias Brauns, Ang Li +4
We present a Josephson junction based on a Ge-Si core-shell nanowire with transparent superconducting Al contacts, a building block which could be of considerable interest for inve…
Hard superconducting gap and diffusion-induced superconductors in Ge-Si nanowires
Joost Ridderbos, Matthias Brauns, Jie Shen +8
We show a hard induced superconducting gap in a Ge-Si nanowire Josephson transistor up to in-plane magnetic fields of mT, an important step towards creating and detecting Maj…
Josephson effect in a few-hole quantum dot
Joost Ridderbos, Matthias Brauns, Jie Shen +5
We use a Ge-Si core-shell nanowire to realise a Josephson field-effect transistor with highly transparent contacts to superconducting leads. By changing the electric field we gain…
Single, double, and triple quantum dots in Ge/Si nanowires
F. N. M. Froning, M. K. Rehmann, J. Ridderbos +6
We report highly tunable control of holes in Ge/Si core/shell nanowires (NWs). We demonstrate the ability to create single quantum dots (QDs) of various sizes, with low hole occupa…
Palladium gates for reproducible quantum dots in silicon
Matthias Brauns, Sergey V. Amitonov, Paul-Christiaan Spruijtenburg +1
We replace the established aluminium gates for the formation of quantum dots in silicon with gates made from palladium. We study the morphology of both aluminium and palladium gate…
Highly tuneable hole quantum dots in Ge-Si core-shell nanowires
Matthias Brauns, Joost Ridderbos, Ang Li +3
We define single quantum dots of lengths varying from 60 nm up to nearly half a micron in Ge-Si core-shell nanowires. The charging energies scale inversely with the quantum dot len…
Anisotropic Pauli spin blockade in hole quantum dots
Matthias Brauns, Joost Ridderbos, Ang Li +3
We present measurements on gate-defined double quantum dots in Ge-Si core-shell nanowires, which we tune to a regime with visible shell filling in both dots. We observe a Pauli spi…
Electric-field dependent g-factor anisotropy in Ge-Si core-shell nanowire quantum dots
Matthias Brauns, Joost Ridderbos, Ang Li +2
We present angle-dependent measurements of the effective g-factor g* in a Ge-Si core-shell nanowire quantum dot. g* is found to be maximum when the magnetic field is pointing perpe…
Printed Circuit Board Metal Powder Filters for Low Electron Temperatures
Filipp Mueller, Raymond N. Schouten, Matthias Brauns +6
We report the characterisation of printed circuit boards (PCB) metal powder filters and their influence on the effective electron temperature which is as low as 22 mK for a quantum…