General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DRT-24-0318
Direction
DRT
Thesis topic details
Category
Technological challenges
Thesis topics
Quantum device integration on Ge/SiGe heterostructures
Contract
Thèse
Job description
Spin qubits in semiconductors quantum dots offer a fast scaling perspective of quantum processors by leveraging the manufacturing techniques of the microelectronics industry. To explore this approach, industrial research teams implemented qubits directly on their existing routes (e.g. FDSOI at CEA-Leti or FinFET at Intel). However, these devices suffer from an important electrostatic disorder stemming from the presence of an Si/SiO2 interface next to the qubits.
An alternative way consists in using semiconductor heterostructures based on Ge/SiGe stacks. They allow the charge confinement between crystalline interfaces, thus drastically reducing the electrostatic disorder. Besides the low effective mass of carriers in Ge allows more relaxed dimensions, while the spin-orbit coupling of holes in Ge allows spin manipulations without integration of any external control element.
The PhD thesis aims at developing a Ge/SiGe-based platform at CEA-Leti. The work will consist in fabricating test structures such as Hall bars on different substrate coupons, perform low temperature characterization and provide feedback to help optimizing the substrates quality. In parallel a 200mm route based on eBeam lithography will be set up for the fabrication of one- and two-dimensional arrays of quantum dots.
University / doctoral school
Electronique, Electrotechnique, Automatique, Traitement du Signal (EEATS)
Université Grenoble Alpes
Thesis topic location
Site
Grenoble
Requester
Position start date
01/09/2024
Person to be contacted by the applicant
BERTRAND Benoit benoit.bertrand@cea.fr
CEA
DRT/DCOS//LDQ
Tutor / Responsible thesis director
DE FRANCESCHI Silvano silvano.defranceschi@cea.fr
CEA
DRF/IRIG//PHELIQS
17 rue des martyrs
38054 Grenoble cedex 9
04 38 78 54 80
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