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-DRF-24-0296
Direction
DRF
Thesis topic details
Category
Condensed Matter Physics, chemistry, nanosciences
Thesis topics
Imaging structure and property in 2D van der Waals ferroelectric materials using 4D scanning transmission electron icroscopy
Contract
Thèse
Job description
This PhD aims to develop analytical techniques enabling to access information on both atomic structure and polarization in two-dimensional van der Waals (2D vdW) ferroelectronic materials. Recently, 2D vdW ferroelectric systems have been discovered with novel polarization mechanisms explained by subtly tuned atomic structural configurations. To understand the mechanisms that drive spontaneous polarization, the ability to probe atomic position and induced properties in atomically thin 2D layers is essential but still a big challenge. Thanks to improvements in detector efficiency and new numerical data treatment capability, transmission electron microscopy (TEM) is becoming an invaluable tool for the study of 2D materials. Aberration correctors allow low voltage operation to avoid damage and provide direct atomic structure, and EELS can provide chemical composition at the atomic level. More recently, 4D-STEM can be used to determine the local electric fields and charges generated in atomically thin 2D materials with sub-angstrom accuracy. The PhD project will use all these new developments recently realized in MEM-LEMMA to explore the feasibility of accessing information on local polarization in innovative 2D vdW ferroelectric materials developed by the collaborators; SPINTEC (CEA) and NCSR (Greece).
University / doctoral school
Ecole Doctorale de Physique de Grenoble (EdPHYS)
Université Grenoble Alpes
Thesis topic location
Site
Grenoble
Requester
Position start date
01/11/2024
Person to be contacted by the applicant
OKUNO Hanako hanako.okuno@cea.fr
CEA
DRF/IRIG//MEM
17 rue des Martyrs
38054 Grenoble cedex 9
04 38 78 20 73
Tutor / Responsible thesis director
OKUNO Hanako hanako.okuno@cea.fr
CEA
DRF/IRIG//MEM
17 rue des Martyrs
38054 Grenoble cedex 9
04 38 78 20 73
En savoir plus
https://www.mem-lab.fr/Pages/LEMMA/STEM.aspx
https://www.mem-lab.fr/LEMMA