All opportunities

Offers : 22

Charge to spin conversion in HgTe topological insulators

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Start date : 1 January 2018

offer n° PsD-DRT-18-0025

The intrinsic spin-momentum locking of Dirac fermions at the surface or interface of topological insulators opens the path towards novel spintronic effects and applications.

Strained HgTe/CdTe is a model topological insulator and a very good candidate to design and demonstrate new spintronic devices exploiting the very large charge to spin conversion efficiency expected for such 2D systems. This postdoc position aims at realizing the first demonstration of the direct charge to spin conversion in topological HgTe nanostructures and use this demonstration as a building block for spin based logic elements.

  • Keywords : Mesoscopic physics, Solid state physics, surfaces and interfaces, DOPT, Leti
  • Laboratory : DOPT / Leti
  • CEA code : PsD-DRT-18-0025
  • Contact : philippe.ballet@cea.fr

Design for reliability for digital circuits

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Start date : 1 March 2018

offer n° PsD-DRT-18-0010

Flash memories are a key enabler for high-temperature applications such as data acquisition and engine control in aerospace, automotive and drilling industries. Unfortunately, the retention time of flash memories is very sensitive to high temperatures. Even at relatively moderated temperatures, flash memories may be affected by retention-related problems especially if they are set to store more than one bit per cell. This impact can be mitigated by periodically refreshing the stored data. The problem is that, in the presence of a variable operating temperature that could be due to variable environmental and workload conditions, a fixed data-refresh frequency may become disproportionately large with a subsequent impact on response time and cycling endurance.

The first objective of this project is to implement a data-refresh method based on a specially designed counter that is able to (a) track the evolution of the temperature and its impact on the data retention time of Flash memory blocks, (b) trigger warnings against potential retention time hazards and (c) provide timestamps.

The second objective is to find the distribution law that gives the evolution of the number of data retention errors in time. The goal is to implement a methodology able to infer the remaining retention time of flash memory pages based on their data retention age, i.e., the elapsed time since data was stored, and the number of retention and non-retention errors.

The publication of the scientific results in high-ranked conferences and journals is major project objective.

  • Keywords : Engineering science, Electromagnetism - Electrical engineering, Electronics and microelectronics - Optoelectronics, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : PsD-DRT-18-0010
  • Contact : valentin.gherman@cea.fr

Chemical Functionalization and Self-assembly of Nanoparticles

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Start date : 1 January 2018

offer n° PsD-DRF-18-0022

A 12-month post-doctoral position is available in CEA-Grenoble (INAC) on the study of self-assembly of colloidal nanoparticles to form hybrid nano-architectures. The goal is to design and prepare hybrid dimers of nanoparticles (quantum dots and metal nanoparticles) of different shapes using biomolecules as linkers in order to explore novel optical phenomena arising from precisely controlled exciton-plasmon interactions. The structural and optical properties of the obtained (bio)hybrid nano-architectures will be studied and confronted to simulations. All building blocks are available and the role of the candidate will be to study the chemical functionalization of nanoparticles and the self-assembly of hybrid dimers as well as the characterization of their structural and optical properties.

The candidate is expected to proactively perform research in a multidisciplinary working environment encompassing chemists, physicists and biologists of two laboratories of INAC, SyMMES (Chemistry) and PHELIQS (Physics).

  • Keywords : Chemistry, INAC, PHELIQS
  • Laboratory : INAC / PHELIQS
  • CEA code : PsD-DRF-18-0022
  • Contact : kuntheak.kheng@cea.fr

Magnetically actuated nanoparticles for targeted cancer therapy

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Start date : 1 January 2018

offer n° PsD-DRF-18-0016

The CEA/INAC SPINTEC and SyMMES labs offer a 24 months post-doctoral position, starting in early 2018, on the design of magnetically actuated nanoparticles (NPs) for targeted cancer therapy. This work is part of the Nanoviber EuroNanomed2 project, with the general goal of achieving preclinical validation and toxicology assessment of these particles. The therapeutic impact of vibrational NPs to treat glioblastoma has been already demonstrated in vitro and, more recently, in vivo. The objective is now to initiate a full translational approach to rigorously address patients with glioblastoma.

Based on previous results obtained in our lab, the candidate will conduct the following studies:

1) Particles fabrication: top-down and bottom-up approaches were developed in our laboratory to prepare anisotropic biocompatible magnetic particles suitable for the foreseen application.

2) Particles functionalization to provide versatile chemical functionalities for easy grafting of biomolecules onto their surfaces.

3) In vitro efficiency and toxicology: Cancer cells death will be assessed after NPs incubation and exposure to magnetic field. Particles toxicity and cells response will be assessed using classical toxicology assays.

This will allow the optimization of the protocol to be used for the forthcoming preclinical validation.

  • Keywords : Life Sciences, Biotechnologies,nanobiology, Ultra-divided matter, Physical sciences for materials, INAC, SPINTEC
  • Laboratory : INAC / SPINTEC
  • CEA code : PsD-DRF-18-0016
  • Contact : robert.morel@cea.fr

Development of an optical microscope for 3D cellular imaging in microfluidics chip

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Start date : 1 November 2017

offer n° PsD-DRT-17-0113

Though still confronted with multiple challenges, regenerative medicine (tissue reconstruction) offers many promises for the future. One of the current limitations remains the tissue vascularization. Ex vivo, this development requires the use of microfluidic systems to mimic vasculogenesis. A challenge remains however to be addressed: the characterization of the reconstructed tissues without altering their functionality to allow implantation. The aim of the project is to develop an optical imaging system allowing a morphological and functional 3D characterization on a micrometric scale of vascularized tissues inside a fluidic chamber. The successful candidate will be responsible for developing and characterizing an innovative optical microscopy system that meets the expected performance to characterize the samples, including spatial resolution, field size, and sensitivity. Coupling and integration with microfluidics systems will be part of the objectives of this development. The candidate will work in a multidisciplinary environment and will have to interact strongly with the biologists and micro-fluidicists of the project to carry out this work.

  • Keywords : Engineering science, Biotechnology, biophotonics, Optics - Laser optics - Applied optics, DTBS, Leti
  • Laboratory : DTBS / Leti
  • CEA code : PsD-DRT-17-0113
  • Contact : pierre.blandin@cea.fr
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