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Ridderbos, Joost (author), Brauns, Matthias (author), Li, Ang (author), Bakkers, E.P.A.M. (author), Brinkman, Alexander (author), Van Der Wiel, Wilfred G. (author), Zwanenburg, Floris A. (author)
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 investigating Majorana bound states, superconducting qubits, and Andreev (spin) qubits. We demonstrate the dc Josephson effect in the form of a finite supercurrent...
journal article 2019
document
Froning, F. N.M. (author), Rehmann, M. K. (author), Ridderbos, J. (author), Brauns, M. (author), Zwanenburg, F. A. (author), Li, A. (author), Bakkers, E.P.A.M. (author), Zumbühl, D. M. (author), Braakman, F. R. (author)
We report highly tunable control of holes in Ge/Si core/shell nanowires. We demonstrate the ability to create single quantum dots of various sizes, with low hole occupation numbers and clearly observable excited states. For the smallest dot size, we observe indications of single-hole occupation. Moreover, we create double and triple tunnel...
journal article 2018
document
de Vries, F.K. (author), Shen, J. (author), Skolasinski, R.J. (author), Nowak, M.P. (author), Varjas, D. (author), Wang, L. (author), Wimmer, M.T. (author), Zwanenburg, F.A. (author), Li, A. (author), Kölling, S. (author), Verheijen, M.P.A.M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author)
Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted great interest in the search for topological superconductors. Both the strong SOI and hard superconducting gap are directly related to the topological protection of the predicted Majorana bound states. Here we explore the...
journal article 2018
document
Brauns, Matthias (author), Ridderbos, Joost (author), Li, Ang (author), Van Der Wiel, Wilfred G. (author), Bakkers, E.P.A.M. (author), Zwanenburg, Floris A. (author)
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 length between 18 and 4 meV. Subsequently, we split up a long dot into a double quantum dot with a separate control over the tunnel couplings and the electrochemical...
journal article 2016
document
Brauns, Matthias (author), Ridderbos, Joost (author), Li, Ang (author), Bakkers, E.P.A.M. (author), Zwanenburg, Floris A. (author)
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 perpendicularly to both the nanowire and the electric field induced by local gates. Alignment of the magnetic field with the electric field reduces g significantly. g is...
journal article 2016
document
Brauns, Matthias (author), Ridderbos, Joost (author), Li, Ang (author), Bakkers, E.P.A.M. (author), Van Der Wiel, Wilfred G. (author), Zwanenburg, Floris A. (author)
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 spin blockade and can assign the measured leakage current at low magnetic fields to spin-flip cotunneling, for which we measure a strong anisotropy related to an...
journal article 2016
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