Post-doc: Molecular Beam Epitaxy of InAs 2DEGs (M/F)
Deadline 28/07/2026
Starting 01/09/2026
Contrat type: Post-doc
Duration: 2 years
Keywords: molecular beam epitaxy, InAs-based 2DEG, superconductors, superconducting quantum technologies, Josephson field-effect transistor
The goal of this project is to design and fabricate InAs-based 2DEGs using molecular beam epitaxy (MBE). MBE allows precise control over layer thickness, doping, and interface quality, which are crucial for minimizing scattering and maximizing electron mobility. We will focus on optimizing growth parameters, interface engineering, and band structure alignment to improve 2DEG performance. Additionally, superconducting layers will be deposited either in situ in a specially designed cluster to enable pristine interfaces or ex situ using a new sputtering system dedicated to superconductors. This will provide great flexibility in material selection and integration strategies.
Structural and chemical analyses will be conducted to identify the interface properties and their impact on transmon specifications. This work will be carried out in collaboration with researchers from the Institut Néel and CEA-PHELIQS, who specialize in X-ray diffraction and transmission electron microscopy, to ensure comprehensive material characterization.
Finally, Josephson field-effect transistors will be fabricated in a cleanroom and measured at low temperatures to evaluate the performance of these Josephson junctions. The fabrication and evaluation of the transmons will be carried out as part of the QUANTIN project in collaboration with partners from CEA-Pheliqs and LPS in Orsay.
Activity
The postdoctoral researcher will be responsible for:
- MBE growth of InAs 2DEGs and superconducting thin films.
- Characterizing the low-temperature 2DEGs InAs (e.g., mobility, carrier density) and the superconducting layers properties (critical temperature, critical current).
- Making contact and providing samples to researchers in charge of X-ray diffraction and transmission electron microscopy.
- Contributing to scientific publications and disseminating results at conferences and workshops.
Work environement
This job proposal is funded by ANR PEPR Quantique through the project QUANTIN, which provides access to state-of-the-art MBE and characterization facilities, as well as a collaborative network of experts in quantum technologies.
The research will be carried out at the Institut Néel, benefiting from a large pool of local research and with existing international collaborations. The postdoc researcher will be integrated in the "Nanophysics and Semiconductors" team of the "Physics - Light - Material" (PLUM) department.