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Offers : 7

Modeling and simulation of superconducting phi-junctions and bi-SQUIDs

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offer n° IMEPLaHC-01232018-CMNE

                                                                          MASTER INTERNSHIP 2018                                                 

                                                     Modeling & simulation of superconducting phi-junctions and bi-SQUIDs

The Laboratory of Microwave and Characterization (IMEP-LAHC, CNRS UMR 5130) of Université Savoie Mont Blanc located in the French Alps area develops ultrafast energy-efficient superconducting digital circuits that work with clock frequencies of several tens of GHz, based on the Rapid Single-Flux Quantum (RSFQ) technology. Such circuits use a binary dynamic logic derived from the underlying physics of shunted Josephson junctions in free-running mode. In present of forced oscillations the strong non-linearity of Josephson junctions leads to the generation of harmonics or frequency mixing depending on the input signals. These effects are used for instance in radioastronomy and have enabled the development of quantum-sensitive terahertz (THz)
receivers, used at the focal point of ground-, balloon- and space-based telescopes.

The objective of this internship is to go one step further and develop new kinds of devices for usage in several additional domains, like security, medicine or telecommunications systems. That is possible by combining analogue and digital devices to build all-superconducting mixed-signal systems. Such developments can also be interesting for the readout of quantum-accurate imagers, magnetometers or quantum computing systems.

The objective of this internship is to focus on two relatively new types of superconducting devices, namely phijunctions [1] and bi-SQUIDs [2]. The work consists of developing specific SPICE-like models and design-tools, based on MatLab or on Python for instance, to predict the behaviour of such devices and incorporate them in superconducting electronics circuits to perform specific tasks. For both devices experimental measurements have been made in the past so that it is possible to compare with the results of simulations.

An education in physics and computer science is best suited to achieve the objectives of this subject.
[1] Menditto, R., Sickinger, H., Weides, M., Kohlstedt, H., Koelle, D., Kleiner, R., & Goldobin, E., “Tunable φ Josephson
junction ratchet. Physical Review E, 94(4), 042202, 2016.
[2] Victor K. Kornev, Nikolay V. Kolotinskiy, Daniil E. Bazulin and Oleg A. Mukhanov, ” High-Inductance Bi SQUID,”
IEEE Trans. Applied Superconductivity, Vol.. 27, No. 4, 1601304, June 2017

Education: Engineering school or master level students

Contact : Pascal Febvre – phone : +33-4-79-75-88-64
Address : Université Savoie Mont Blanc
IMEP-LaHC – CNRS UMR5130
Campus scientifique
73376 Le Bourget du Lac Cedex- France

Internship duration: 4 to 6 months during the January-July 2018 period
Accommodation : Student’s rooms are available on campus for a monthly rent of about 200 euros.
https://www.crous-grenoble.fr/wp-content/uploads/sites/7/2017/06/GuidesResidenceCLOUS-WEB.pdf
This internship comes with a stipend of 554.40 € per month.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-01232018-CMNE
  • Contact : Pascal.Febvre@univ-smb.fr

Development of a simulation software of superconducting electronics based on the use of Josephson junctions at terahertz frequencies

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offer n° IMEPLaHC-01242018-CMNE

                                      MASTER INTERNSHIP 2018                                            

      Development of a simulation software of superconducting electronics based on the use of Josephson junctions at terahertz frequencies

The Laboratory of Microwave and Characterization (IMEP-LAHC, CNRS UMR 5130) of Université Savoie Mont Blanc located in the French Alps area develops ultrafast energy-efficient superconducting digital circuits that work with clock frequencies of several tens of GHz, based on the Rapid Single-Flux Quantum (RSFQ) technology. Such circuits use a binary dynamic logic derived from the underlying physics of shunted Josephson junctions in free-running mode. In present of forced oscillations the strong non-linearity of Josephson junctions leads to the generation of harmonics or frequency mixing depending on the input signals. These effects are used for instance in radioastronomy and has enabled the development of quantum-sensitive terahertz (THz) receivers,
used at the focal point of ground-, balloon- and space-based telescopes.

The objective of this internship is to go one step further and develop new kinds of devices for usage in several additional domains, like security, medicine or telecommunications systems. That is possible by combining analogue and digital devices to build all-superconducting mixed-signal systems. Such developments can also be interesting for the readout of quantum-accurate imagers, magnetometers or quantum computing systems.

To do so we need to develop user-friendly softwares that can enable the simulation of systems based on Josephson junctions. For this particular subject, the work will be focused on the analogue mode of operation of Josephson junctions in the THz domain. The objective of the work is to build a user-friendly software
programmed in C/C++ or Python for instance and that can be compiled to run on different operating systems (at least Linux and MacOSX). The student will benefit at the beginning of a dedicated education to deal with the detailed physics of Josephson junctions. Some preliminary kernel codes, written in Fortran, already exist. The full formalism of equations to be used is also ready.

An education in physics and computer science is best suited to achieve the objectives of this subject.

Education: Engineering school or master level students

Contact : Pascal Febvre – phone : +33-4-79-75-88-64

Address : Université Savoie Mont Blanc
IMEP-LAHC – CNRS UMR5130
Campus scientifique
73376 Le Bourget du Lac Cedex- France

Internship duration: 4 to 6 months during the January-July 2018 period

Accommodation : Student’s rooms are available on campus for a monthly rent of about 200 euros.
https://www.crous-grenoble.fr/wp-content/uploads/sites/7/2017/06/GuidesResidenceCLOUS-WEB.pdf
This internship comes with a stipend of 554.40 € per month.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-01242018-CMNE
  • Contact : Pascal.Febvre@univ-smb.fr

Optimization of the resistive switching in LaMnO3-based devices

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offer n° LMGP2018_10

Abstract
Recently, resistive random access memories (ReRAM) have generated significant interest both in industry and in the scientific community for their use as non-volatile memory beyond Flash memory scaling. ReRAMs are considered one of the most promising emerging non-volatile memories due to high speed, high density, great scalability and low power consumption. Recent work carried out in the group has pointed out towards lanthanum manganite as an attractive switching material. The goal of this project is to optimize the chemical deposition parameters of LaMnO3 by innovative research strategies with the aim of improving and tuning their resistive switching properties.
Project description
This project will focus on the synthesis and tailoring of LaMnO3-δ oxides with perovskite-type structure, which will be studied as memristive materials and will be carried out within the framework of an ANR project (Alps Memories project).
The Masters student will focus on the preparation of the manganite thin films by Metal Organic Chemical Vapour Deposition (MOCVD) and on their structural and microstructural characterization. MOCVD will be used as the deposition technique for its precise control and reproducibility. The obtained films will be fully analyzed (see Figure 1): X-ray diffraction (Theta-2theta, GIXRD, and Reflectometry), atomic force microscopy, electron microscopy (FEG-SEM, TEM) and in‐situ Raman spectroscopy will be routinely used for the physical characterization. The LMGP houses state of the art experimental equipment for investigating such properties.
The materials functional properties will be optimized by exploring the effects of a number of parameters allowing morphology control and epitaxial strain engineering. The tuning and optimization of the chemical deposition parameters by these research strategies will be used as the main tools to modify the physico-chemical, structural and microstructural properties to enhance the resistive switching performance.
Scientific environment:
The candidate will work in the FM2N group within the LMGP, Materials and Physical Engineering Laboratory. Located in the heart of an exceptional scientific environment, the LMGP offers the applicant a rewarding place to work.
LMGP Web Site: http://www.lmgp.grenoble-inp.fr/
Profile & requested skills:
We are looking for a highly-motivated Engineering School or M2 Masters student with a strong interest in experimental physics and materials science. Interpersonal skills, dynamism, rigor and teamwork abilities will be appreciated. Candidates should be fluent in English and/or in French and have good English writing skills
Subject could be continued with a PhD thesis: YES
Allowance: Internship allowance will be provided

PDF Version 2017-2018-Master2R PFE_Intership-optimization RS properties of LMO

  • Keywords : Electronics and microelectronics - Optoelectronics, Materials and applications, FMNT, LMGP
  • Laboratory : FMNT / LMGP
  • CEA code : LMGP2018_10
  • Contact : carmen.jimenez@grenoble-inp.fr

(filled) Material and interface quality analysis by surface harmonic generation (SHG)

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offer n° IMEPLaHC-11142017-CMNE

Laboratory : IMEP-LaHC, Grenoble-INP

Contact: Irina Ionica

Key words:
second harmonic generation, thin layers optical properties, modeling

Context:
This topic is in the context of research on novel characterization methods of ultra-thin films and interface quality for applications in micro, nanoelectronics, photovoltaics, photonics, etc.
A key element today is to propose and develop innovative characterization methods that do not need any physical contact, therefore avoiding any damage of the advanced ultra-thin substrates.
A very promising technique was recently proposed: the second harmonic generation (SHG)1. A laser emitting at the fundamental frequency can induce polarisation of the material. The intensity measured at double frequency is proportional to the second order non-linear polarisation of the material and is named the second harmonic. An additional SHG contribution can appear due to the electric field induced second harmonic (EFISH). The interest in the SHG resides in its sensitivity to material and interfaces quality and particularly to the electric field at semiconductor – dielectric interfaces, which is related to presence of charges (fixed, interface states, traps, etc).

Objective:
An innovative SHG equipment, unique in Europe, very recently developed and fabricated by FemtoMetrix (USA) was recently installed at IMEP-LAHC.
The first objective will consist in qualifying the measurement tool, using different samples (dielectrics on semiconductors, silicon-on-insulators…).
Based on these results, the second objective is to validate and extend models for SHG, for the extraction of material quality parameters such as the density of interface states.

Requested competences:
This topic is an interdisciplinary topic, in the fields of optics, micro-electronics, and material science. The candidate must have a very good background in optics,
semiconductor physics, microelectronics.

Collaborations:
This work is done in the context of different collaborations that the team has with groups (academic and industrial) involved in the material fabrication (INSA Lyon, SOITEC, CEA-LETI). She/he will also be in contact with the tool fabricant in California. Therefore the student will be in a stimulating professional environment, in touch with both academic and industrial research actors which should be very beneficial for hers/his future career.

The internship topic is going to be proposed for a PhD thesis, starting from October 2018.

1 B. Jun, et al., IEEE Transactions on Nuclear Science, vol 51, 3231 (2004).
M.L. Alles et al, IEEE Transactions on Semiconductor Manufacturing, vol. 20, 107 (2007

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-11142017-CMNE
  • Contact : Irina.Ionica@phelma.grenoble-inp.fr
  • This Internship position has been filled. Thank you for your interest

(filled) Toward a better understanding of the microbial growth inhibition by electromagnetic fields

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offer n° IMEPLaHC-02022017-RFM

                                   Logo_IMEP-LAHC                   Master thesis proposal – MARCH to JULY 2017        

Toward a better understanding of the microbial growth inhibition by electromagnetic fields

Keywords :
Electromagnetism, microbial decontamination, growth inhibition mechanisms, numerical modeling

Labs :
Institut de Microélectronique, Electromagnétisme et Photonique- Laboratoire d’Hyperfréquences et de Caractérisation (IMEP-LaHC)
Minatec – 3, parvis Louis Néel, BP 257
38 016 GRENOBLE Cedex 1, FRANCE

Institut des Géosciences de l’Environnement (IGE, UGA-CNRS-IRD-G-INP)
70 rue de la Physique, Bâtiment OSUG B , BP 53
38 041 GRENOBLE Cedex 09, FRANCE

Directors :
XAVIER Pascal, pascal.xavier@univ-grenoble-alpes.fr, +33 (0)4.56.52.95.69
MARTINS Jean, jean.martins@univ-grenoble-alpes.fr, +33 (0)4.76.63.56.04

Required skills and level of the applicant :
Master in biomedical or biophysical engineering. Some work experience in electronics are also desired.

 Scientific context and objectives
In the battle against pathogenic microorganisms, in addition to the oldest curative process of pasteurization (heating) requiring large quantities of energy, current methods are mechanical actions (brushing) and the action of chemical products: acetic acid, hydrogen peroxide, chlorine dioxide… For example, the cheese industry is one of the largest users of chlorine. Unfortunately, some strains have become very resistant.
The use of physical means for the decontamination of water has only been explored for less than a century. Low intensity DC or AC current has been proven to be effective. This process was reported more than fifty years ago. Most articles in the literature focus on improving the effectiveness of antibiotics against microorganisms by applying weak currents, a phenomenon called “bioelectric effect” (Blenkinsopp 1992, Costerton 1994, Giladi 2008).
Several mechanisms have been proposed for this inhibition: electrolysis, production of toxic derivatives and free radicals linked to the electrodes, modification of the pH. In addition, the application of a high amplitude pulsed electric field has been used as a non-thermal effect for the inhibition of bacterial growth with the major disadvantage of the phenomenon of electroporation.
High-frequency electromagnetic fields (above MHz) but with small amplitudes (<1 V / cm) have also been reported as a means to improve the susceptibility of bacteria to antibiotics or to decrease their number in the absence of an antibiotic (Asami 2002, Bai 2006, Caubet 2004).
By exploiting this idea between 2011 and 2015, in the framework of the APELBIO project resulting from the ECO-INDUSTRY program of the French Ministry of Industry and carried out by the SME LEAS, in collaboration with SCHNEIDER ELECTRIC and two Grenoble laboratories involved in this project (IMEP-LAHC and IGE), we validated an innovative, non-polluting and energy-saving experimental concept for the prevention of microbial contamination in aqueous media . We noted that the optimal frequency for which this inhibition was maximal appeared to depend on the type of bacterium, which was confirmed by our numerical simulations using the COMSOL Multiphysics software with an original model (Xavier 2017). So we had the idea of using a white noise source (10kHz-10MHz) instead of a CW source. Our results, better than with a fixed frequency source, are in the state of the art and led to a patent in May 2015. Unfortunately, the fine mechanisms leading to the growth inhibition of bacterial cells could not be precisely identified. This is what we intend to begin to do in the framework of this master thesis project.

1 / Design and realization of a compact instrument covering the 10 Hz – 50 MHz range for pilot experiments. This stand-alone instrument is based on the implementation of a DDS component in conjunction with a microcontroller. It will have the task of generating in a perfectly controlled manner the electromagnetic noise enabling the decontamination and, alternatively, of measuring the impedance detecting the decontaminating effect. A first prototype has already been developed recently and allowed us to carry out preliminary tests with the bacterium Escherichia coli.
The in situ detection of the decontamination efficiency requires a bio-impedance measurement of the solution containing the microorganisms. This last subject has, for many years, given rise to many patents and works: we know what toavoid to build a compact device, insensitive to the effects of electrodes

2 / First decontamination tests carried out following a wide range of physical conditions (amplitude and frequency of electromagnetic waves), chemical (variable geochemical environment, in terms of composition and strength ionic properties of the solution, which have an important effect on the surface properties of living cells, such as their zeta potential or their dispersed or agglomerated state which can potentially modulate electromagnetic effects) and biological (the type of bacterium studied could influence the electromagnetic effects already Observed on E. coli).

References

* IMEP-LAHC and IGE groups
Xavier P., D. Rauly, E. Chamberod and J.M.F. Martins. Theoretical evidence of maximum intracellular currents vs frequency in an Escherichia coli cell submitted to AC voltage. Bioelectromagnet. J. DOI:10.1002/bem.22033.
Archundia D., C. Duwig, L. Spadini, G. Uzu, S. Guédron, M.C. Morel, R. Cortez, Oswaldo Ramos, J. Chincheros, and J.M.F. Martins. How uncontrolled urban expansion increases the contamination of the Titicaca lake basin (El Alto – La Paz, Bolivia). Water, Air and Soil Pollution J. In press. 2017.
Navel A., L. Spadini, J.M.F. Martins, E. Vince and I. Lamy. Soil aggregates as a scale to investigate organic matter versus clay reactivities toward metals and protons. Accepted with revision. Eur. J. Soil Sci. 2017.
Archundia, D., C. Duwig, F. Lehembre, S. Chiron, M-C Morel, B. Prado, M. Bourdat-Deschamps, E. Vince, G. Flores Aviles and J.M.F. Martins. Antibiotic pollution in the Katari subcatchment of the Titicaca Lake: major transformation products and occurrence of resistance genes. Sci. Total Environ. 576 : (15) 671–682. 2017.
Ivankovic T., S. Rolland du Roscoat, C. Geindreau, P. Séchet, Z. Huang and J.M.F. Martins. Development and evaluation of an experimental and protocol for 3D visualization and characterization of bacterial biofilm’s structure in porous media using laboratory X-Ray Tomography. (GBIF-2016-0154). In press Biofouling J.
Simonin M., J.M.F. Martins, G. Uzu, E. Vince and A. Richaume. A combined study of TiO2 nano-particles transport and toxicity on microbial communities under acute and chronic exposures in soil columns. DOI: 10.1021/acs.est.6b02415. Environ. Sci. & Technol. 50: 10693–10699. 2016.
Simonin M., J. P. Guyonnet, J.M.F. Martins, M. Ginot and A. Richaume. Influence of soil properties on the toxicity of TiO2 nanoparticles on carbon mineralization and bacterial abundance. J. Haz. Mat. 283: 529-535. 2015.
D. Rauly, E. Chamberod, P. Xavier, J. M.F. Martins, J. Angelidis, H. Belbachir. First approach toward a modelling of the impedance spectroscopic behavior of microbial living cells, COMSOL Conference, Grenoble, 14-16 Octobre 2015
D. Rauly, E. Chamberod, P. Xavier, J. M.F. Martins, J. Angelidis, H. Belbachir, Stochastic Approach for EM Modelling of Suspended Bacterial Cells with Non-Uniform Geometry & Orientation Distribution, 36ème Progress In Electromagnetics Research Symposium (PIERS 2015), Prague (Rép Tchèque), 06-09/07/2015

* Others
Asami K. 2002. Characterization of biological cells by dielectric spectroscopy. Journal of Non-Crystalline Solids 305(1–3):268–277.
Blenkinsopp, A E Khoury, and J W Costerton. Electrical Enhancement of biocide efficay against Pseudomonas aeruginosa biofilms. Applied and Environmental Microbiology    Appl. Environ. Microbiol. November 1992 ; 58:11 3770-3773
Bai W, Zhao KZ, Asami K. 2006. Dielectric properties of E. coli cell as simulated by the three-shell spheroidal model. Biophysical Chemistry 122 :136–142.
Caubet R, Pedarros-Caubet F, Chu M, Freye E, de Belém Rodrigues M, Moreau JM, Ellison WJ. 2004. A radio frequency electric current enhances antibiotic efficacy against bacterial biofilms. Antimicrobial Agents and Chemotherapy 48(12):4662-4664.
Costerton JW, Ellis B, Lam K, Johnson F, Khoury AE. 1994. Mechanism of electrical enhancement of efficacy of antibiotics in killing biofilm bacteria. Antimicrobial Agents and Chemotherapy 38(12):2803-2809.
Giladi M, Porat Y, Blatt A, Wasserman Y, Kirson ED, Dekel E, Palti Y. 2008. Microbial growth inhibition by alternating electric fields. Antimicrobial Agents Chemotherapy 52(10):3517–3522.
Guiné V, Spadini L, Muris M., Sarret G., Delolme C., Gaudet JP, Martins JMF. 2006, Zinc Sorption to cell wall components of three gram-negative bacteria: a combined titration. Modelling and EXAFS study. Environ. Sci. Technol.  40 :1806-1813.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-02022017-RFM
  • Contact : pascal.xavier@univ-grenoble-alpes.fr
  • This Internship position has been filled. Thank you for your interest
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