Post-doctoral position on twisted-BN-based 2D nanostructures by advanced transmission electron microscopy (M/F)

Job Description

Missions

Study of the structural, electronic, and optical properties of twisted two-dimensional BN nanostructures by transmission electron microscopy (TEM)

Activity

- Identification of the structural properties of stacking sequences (number of layers, twist angle, stresses) using different imaging modes and TEM analysis
- Implementation of advanced techniques such as 4D-STEM and DPC (Differential Phase Contrast)
- Acquisition of angle-resolved electronic energy loss maps (AR-EELS), CVD (Chemical Vapor Deposition)
- Synthesis of hBN, glovebox fabrication of BN-based nanostructures.

Your Profil

Skills

- Strong skills in TEM (different modes: imaging, 4D-STEM, EELS, etc.)
- Ability to set up original instrumental developments, experience in investigating low-dimensional structures (2D, 1D, 0D, etc.) or quantum materials.
- Previous experience in synthesis/fabrication of nanomaterials would be a real plus.

Your Work Environment

The Laboratoire d'Étude des Microstructures (LEM), a joint research unit of CNRS and ONERA (UMR 104), conducts fundamental research in materials physics and aims to understand the formation of micro- and nanostructures, their evolution, and the associated macroscopic properties. The approach combines theoretical developments, experimental investigations, and advanced modeling.
The aim of the proposed postdoctoral project is to carry out a state-of-the-art experimental investigation of the intimate link between the structure and the electronic and/or optical properties of nanostructures composed entirely or partially of twisted BN layers, a topic at the core of the recently emerged field of twistronics that has attracted strong interest from the scientific community. In such structures, BN planes are stacked on top of each other with different orientations that may be random or purposely tuned. Thus, local stacking registries develop in the same sample, each endowing the structure with specific and often novel properties. The project will benefit from the recognized expertise of the laboratory on BN materials and will exploit the full potential of the recently acquired MOSTRA Transmission Electron microscope. The machine, a JEOL probe-corrected NEOARM equipped with a cold FEG, capable of operating at 30, 60, 80 and 200 kV in all of its acquisition modes, brings together a unique set of functionalities and implements cutting-edge techniques such as 4D-STEM and DPC. Furthermore, a customized CEOS Energy filter enables the acquisition of Angle-Resolved Electron Energy Loss (AR-EELS) maps, particularly relevant for the investigation of the dielectric function in anisotropic or angle-dependant systems like twisted nanostructures.

In addition, the researcher will take advantage of other assets of the Laboratoire d'Etude des Microstuctures (LEM). The direct access to dedicated synthesis and fabrication facilities (CVD, glove box) and to LEM's dense network of collaborations (legacy of the Graphene Flagship, GDR 2D+) will be crucial to provide samples for the project. Further development will be granted by the dialog with advanced atomistic simulations (ab initio and tight-binding) carried out in the laboratory and the lively context offered by ONERA, including access to other characterization methods (Raman, photoluminescence) and the connection with the Qtech laboratory which is devoted to applied studies on quantum materials.

Compensation and benefits

Compensation

081,33 à 3519,85 € per month

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

The research professions