VTT Technical Research Centre of Finland
PI: Dr. Alberto Ronzani
The Team
Alberto Ronzani (PI)
I am the coordinator of the JOGATE project. My role is to support the smooth operation of the collaborative activities of all beneficiaries, fostering development and exploitation of the project’s key results. Moreover, as a PI for VTT’s research contribution, I lead a compact team of young researchers in the investigation of high transparency in metal-semiconductor contacts towards realizing silicon-based Josephson field-effect transistors and superconducting diodes
Jorden Senior
Jani Taskinen
My main role in JOGATE consists of device design and fabrication oversight of silicon‑based hybrid Josephson devices. With my cleanroom expertise from my doctoral studies, I am making key contributions to advance the nanoscale patterning in our fabrication processes using electron‑beam lithography. During the project, I am providing guidance and mentoring to early‑career researchers in our team, and I will be expanding my role into cryogenic measurements, gaining hands‑on experience in low‑temperature device characterization
Achini Rathnathilaka
I began my work at JOGATE through my master’s thesis, focusing on the growth of thin silicon nitride films to create a controllable nanometer-scale dielectric barrier between a superconductor and a semiconductor. Currently, I am studying silicon-based Josephson field-effect transistors with the goal of developing my skills as an independent researcher. My responsibilities in JOGATE include planning fabrication runs with senior team members and carrying out fabrication processes such as sputtering, plasma and wet etching, rapid thermal annealing. I also perform characterization using scanning electron microscopy, atomic force microscopy, ellipsometry, and contact sheet resistance measurements at room temperature
Tuomas Vaimala
My main contributions for JOGATE are related to room temperature device characterization for silicon-based Josephson devices. Over the timeline of the project, I have contributed to device fabrication processes and have made efforts to understand the drive-in process of the phosphorus dopants into silicon with rapid thermal annealing with help of TCAD process simulation tool Silvaco Athena. During the project I have gained expertise in multiple device characterization methods such as ellipsometry, room temperature probing and cryogenic probing
Adrián Gutiérrez Cruz
My research focuses on the experimental realization of silicon-based Josephson field effect transistors. I work on developing and improving fabrication and characterization techniques to study material properties and ensure precise control over critical parameters. I joined JOGATE, initially to design an etching process that minimizes substrate damage, which helps improve transparency at the metal-semiconductor interface
University of Regensburg
PI: Dr. Nicola Paradiso
The Team
Nicola Paradiso (PI)
I coordinate the work on hybrid super-semiconductors. My goal in JOGATE is to investigate nonreciprocal effects in Josephson junctions and in general in superconductors in systems with large spin-orbit interaction. Such effects provide a benchmark for the implementation of superconducting diodes from Si-based devices
Johanna Berger
I perform experimental studies of the anomalous Josephson and supercurrent diode effect arising in hybrid Al/InAs Josephson junctions. Adapted junction geometries as well as electrostatic gating allow a direct and simultaneous measurement of both effects on the very same device
Simon Feyrer
I am performing experimental work on investigating the induced superconductivity in synthetic Rashba superconductors. For this I design and fabricate lumped element microwave resonators and measure their frequency response under applied in-plane magnetic field
Benedikt Baumgartner
I study transport in CoSi2, a potential unconventional superconductor. I investigate magnetochiral effects in the inductance by applying both a DC bias current and an in-plane magnetic field orthogonal to the current density. I also look for signatures of Lifshitz invariants – indicating Rashba spin-orbit interaction – and a superconducting diode effect
Chalmers University of Technology
PI: Prof. Simone Gasparinetti
University of Jyväskylä
PI: Prof. Tero T. Heikkilä
The Team
Tero Heikkila (PI)
I lead the theory development in JOGATE. Besides supporting the experimental work, it concentrates on developing models for Josephson diodes in different types of materials and devices, studies the behavior of the diodes in circuits and explores new device concepts based on gated Josephson junctions
Daniel Crawford
I study new magnetoelectric phenomena in superconducting devices, such as our recent work on the rotary invariant. I also study nonequilibrium effects in superconducting circuits, where it is possible to see interesting effects such as chaos and multistability
Chen-How Huang
I study non-reciprocal devices in Josephson junctions and quantum dots. And the numerical implementations of Usadel equation solver for AC driven systems
French Alternative Energies and Atomic Energy Commission
PI: Dr. François Lefloch
The Team
François Lefloch (PI)
In JoGATE, I am coordinating WP2 on “Contact interface engineering for low-dissipation nanoelectronics”. I will also be in charge of the supervising and conducting measurement at very low temperature of silicon based superconducting devices. The goal is to benchmarks conditions in which the contact transparency between the superconducting Source/Drain contact and the silicon channel is good enough to allow superconducting correlations to propagate in the channel transistors
Sébastien Kerdilès
I will bring my expertise in the annealing processes to integrate superconducting silicides and heavily boron doped silicon in FDSOI transistors. Processes using standard Rapid Thermal Annealing and more innovative Nanosecond Pulse Laser Annealing will be investigated
Paul Dumas
I will work in JoGATE in close collaboration with the CEA LETI clean room facilities to manage the advances of the fabrication of superconducting FDSOI transistors. I will also contribute to the definition of the process flow compatible with the accessible tools
Frédéric Gustavo
Together with Paul Dumas, I will be in charge of the fabrication of the silicon transistors. I will be in charge of the characterization of the superconducting properties of various materials