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Christian Ulysse

Christian Ulysse
C2N - Centre de Nanosciences et de Nanotechnologies

PhD

About

141
Publications
16,182
Reads
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2,174
Citations
Additional affiliations
January 2005 - present
Laboratoire de Photonique et de Nanostructures
Position
  • Engineer

Publications

Publications (141)
Article
A dome‐shaped phase diagram of superconducting critical temperature upon doping is often considered as a hallmark of unconventional superconductors. This behavior, observed in SrTiO3‐based interfaces, whose electronic density is controlled by field‐effect, has not been explained unambiguously yet. Here, a generic scenario for the superconducting ph...
Article
Full-text available
Arrays of superconducting quantum interference devices (SQUIDs) are highly sensitive magnetometers that can operate without a flux-locked loop, as opposed to single SQUID magnetometers. They have no source of ambiguity and benefit from a larger bandwidth. They can be used to measure absolute magnetic fields with a dynamic range scaling as the numbe...
Preprint
Full-text available
A dome-shaped phase diagram of superconducting critical temperature upon doping is often considered as a hallmark of unconventional superconductors. This behavior, observed in two-dimensional electron gases in SrTiO3-based interfaces whose electronic density is controlled by field effect, has not been explained unambiguously yet. Here, we elaborate...
Article
We compare the potential of SQUID arrays and Josephson junction arrays as magnetic field detectors in an open-loop configuration, accounting for such limitations as technological parameter fluctuations, current density distribution and self-field effects originating from the bias current. Because of the simplicity of its single layer process, the i...
Article
Recent experiments have shown that proximity with high-temperature superconductors induces unconventional superconducting correlations in graphene. Here, we demonstrate that those correlations propagate hundreds of nanometers, allowing for the unique observation of d-wave Andreev-pair interferences in YBa2Cu3O7-graphene devices that behave as a Fab...
Article
Full-text available
The Josephson junction (JJ) is the corner stone of superconducting electronics and quantum information processing. While the technology for fabricating low Tc JJ is mature and delivers quantum circuits able to reach the “quantum supremacy”, the fabrication of reproducible and low-noise high-Tc JJ is still a challenge to be taken up. Here we report...
Article
Full-text available
Arrays of Superconducting interference devices (SQUIDs) deserve much attention for high frequency magnetic field detection because of the combined advantages of wideband radiofrequency operation and improved dynamic range compared to single SQUID magnetometers. Indeed, in principle the dynamic range should scale as the square root of the number of...
Article
Full-text available
We present the noise performance of high electron mobility transistors (HEMT) developed by CNRS/C2N laboratory. Various HEMT’s gate geometries with 2 pF to 230 pF input capacitance have been studied at 4 K. A model for both voltage and current noises has been developed with frequency dependence up to 1 MHz. These HEMTs exhibit low dissipation, exce...
Article
Full-text available
The electric-field effect control of two-dimensional electron gases (2-DEGs) has allowed nanoscale electron quantum transport to be explored in semiconductors. Structures based on transition metal oxides have electronic states that favour the emergence of novel quantum orders that are absent in conventional semiconductors and the 2-DEG formed at a...
Preprint
Full-text available
Recent experiments have shown that superconducting correlations can be induced in graphene by proximity with high-temperature (cuprate) superconductors. Here we demonstrate that such correlations can propagate hundreds of nm into large-scale grown graphene, thereby allowing for the unusual observation of long-range interferences between d-wave Andr...
Presentation
Full-text available
The presentation will focus on the recent commissioning of the first French metrological atomic force microscope (mAFM), the keystone of a new traceability chain implemented by the French national metrology institute (LNE) for dimensional measurements performed at the nanometre scale.
Preprint
Full-text available
We present the noise performance of High Electron Mobility Transistors (HEMT) developed by CNRS-C2N laboratory. Various HEMT's gate geometries with 2 pF to 230 pF input capacitance have been studied at 4 K. A model for both voltage and current noises has been developed with frequency dependence up to 1 MHz. These HEMTs exhibit low dissipation, exce...
Preprint
Full-text available
We report on DC and RF properties of high-$T_{c}$ Josephson Junctions fabricated by mean of a Helium ion beam focused at sub-nanometer scale, which locally modifies the superconductor. Starting from a 50 nm thick $\mathrm{YBa}_2\mathrm{Cu}_3\mathrm{O}_7$ film, we made Josephson junctions with different irradiation doses from 200 to 600 ions/nm, and...
Article
Full-text available
At this time, there is no instrument capable of measuring a nano-object along the three spatial dimensions with a controlled uncertainty. The combination of several instruments is thus necessary to metrologically characterize the dimensional properties of a nano-object. This paper proposes a new approach of hybrid metrology taking advantage of the...
Poster
Full-text available
Le poster se focalisera sur la récente mise en service du premier AFM métrologique (mAFM) français. Cet instrument de référence développé par le LNE matérialise une nouvelle voie de traçabilité pour les mesures dimensionnelles réalisées à l’échelle nanométrique. Il délivre des mesures directement traçables au mètre SI (Système international d’unité...
Article
Full-text available
We have fabricated arrays of High-Tc Superconducting Quantum Interference Devices (SQUIDs) with randomly distributed loop sizes as sensitive detectors for Radio Frequency (RF) waves. These subwavelength size devices known as Superconducting Quantum Interference Filters (SQIFs) detect the magnetic component of the electromagnetic field. We used a sc...
Article
Full-text available
We introduce a scanning probe technique derived from scanning gate microscopy (SGM) to investigate thermoelectric transport in two-dimensional semiconductor devices. Thermoelectric scanning gate microscopy (TSGM) consists in measuring the thermoelectric voltage induced by a temperature difference across a device while scanning a polarized tip that...
Preprint
Full-text available
Electric-field effect control of two-dimensional electron gases (2-DEG) has enabled the exploration of nanoscale electron quantum transport in semiconductors. Beyond these classical materials, transition metal-oxide-based structures have d-electronic states favoring the emergence of novel quantum orders absent in conventional semiconductors. In thi...
Article
Full-text available
We investigate on the integration density limit of the superconducting technology for Josephson devices and circuits based on ion-damaged barrier. This technology is suitable for very large integration of superconducting circuits as the footprint of the Josephson junction is of the order of 40 nm by 2 μm. Series arrays of Josephson junction can be...
Preprint
Full-text available
We have fabricated arrays of High-T$_c$ Superconducting Quantum Interference Devices (SQUIDs) with randomly distributed loop sizes as sensitive antennas for Radio-Frequency (RF) waves. These sub-wavelength size devices known as Superconducting Quantum Interference Filters (SQIFs) detect the magnetic component of the electromagnetic field. We use a...
Article
Superconducting quantum interference filters, or SQIFs, are a promising class of highly sensitive magnetometers benefiting from a highly peaked and symmetric magnetic response at zero-input flux. They can be used in magnetometry, e.g., in wideband applications. A simple solution to increase further their sensitivity is to add a superconducting flux...
Article
We report on the experimental evaluation of dispersion effects on SQUID arrays made with high temperature superconductor technology. The dispersion of Josephson junction parameters not only results in different operational temperature ranges, but also in a flux-shift of the voltage versus flux response of the SQUID. Another contribution to the phas...
Poster
Full-text available
We propose a novel approach of hybrid metrology combining AFM (Atomic Force Microscopy) and SEM (Scanning Electron Microscopy) measurements for measuring the characteristic dimensions of nanoparticles (NP) in 3D with controlled uncertainties. This method takes advantage of the complementary nature of both techniques: SEM gives no quantitative infor...
Article
Full-text available
We introduce a new scanning probe technique derived from scanning gate microscopy (SGM) in order to investigate thermoelectric transport in two-dimensional semiconductor devices. The scanning gate thermoelectric microscopy (SGTM) consists in measuring the thermoelectric voltage induced by a temperature difference across a device, while scanning a p...
Article
Full-text available
Superconducting Quantum Interference Filters (SQIF) are promising devices for Radio- Frequency (RF) detection combining low noise, high sensitivity, large dynamic range and wide-band capabilities. Impressive progress have been made recently in the field, with SQIF based antennas and amplifiers showing interesting properties in the GHz range using t...
Article
Full-text available
We have studied the evolution of the surface plasmon resonances of individual ion-beam shaped prolate gold nanoparticles embedded in a dielectric SiO2 environment by electron energy loss spectroscopy mapping in a scanning transmission electron microscope. The controlled symmetric dielectric environment obtained through the ion-beam shaping method a...
Article
We designed, fabricated and measured short one-dimensional arrays of masked ion-irradiated YBa2Cu3O7 Josephson junctions embedded into log-periodic spiral antennas. They consist of four or eight junctions separated either by 960nm or 80nm long areas of pristine material. Large spacing arrays show 'giant' Shapiro steps in the hundreds-GHz band at 66...
Article
Full-text available
We demonstrate systematic resonance fluorescence recovery with near-unity emission efficiency in single quantum dots embedded in a charge-tunable device in a wave-guiding geometry. The quantum dot charge state is controlled by a gate voltage, through carrier tunneling from a close-lying Fermi sea, stabilizing the resonantly photocreated electron-ho...
Article
Full-text available
A major objective in photonics is to tailor the emission properties of microcavities which is usually achieved with specific cavity shapes. Yet, the dynamical change of the emission properties during operation would often be advantageous. The implementation of such a method is still a challenging issue. We present an effective procedure for the dyn...
Article
Current-driven domain wall motion is investigated experimentally in in-plane magnetized (Ga,Mn)As tracks. The wall dynamics is found to differ in two important ways with respect to perpendicularly magnetized (Ga,Mn)As: the wall mobilities are up to ten times higher and the walls move in the same direction as the hole current. We demonstrate that th...
Article
Full-text available
We designed, fabricated and tested short one dimensional arrays of masked ion-irradiated YBa$_2$Cu$_3$O$_7$ Josephson junctions (JJ) embedded into log-periodic spiral antennas. Our arrays consist of 4 or 8 junctions separated either by 960~nm or 80~nm long areas of undamaged YBCO. Samples with distanced junctions and with closely spaced junctions s...
Article
Full-text available
Addressing the optical properties of a single nanoparticle in the infrared is particularly challenging, thus alternative methods for characterizing the conductance spectrum of nanoparticles in this spectral range need to be developed. Here we describe an efficient method of fabricating single nanoparticle tunnel junctions on a chip circuit. We appl...
Article
This second paper on the Fabry-Perot cavity presents a semi-classical approach, which means that we consider the transition from wave optics to geometrical optics. The basic concepts are the periodic orbits and their stability. For the plano-concave Fabry-Perot cavity in the paraxial approximation, the derivation of the trace formula demonstrates t...
Article
Full-text available
Ion beam shaping is a novel and powerful tool to engineer nanocomposites with effective three-dimensional (3D) architectures. In particular, this technique offers the possibility to precisely control the size, shape and 3D orientation of metallic nanoparticles at the nanometer scale while keeping the particle volume constant. Here, we use swift hea...
Conference Paper
Full-text available
Based on AlGaAs/GaAs heterojunction, a 2DEG (Two dimensional Electron Gas) with high electron mobility at low temperature can be obtained and used to investigate quantum transports of electrons at low temperature in mesoscopic physics. Beyond the basic research, we used a 2DEG and the QPC (Quantum Point Contact) configuration to demonstrate a fully...
Article
Full-text available
The Kondo effect is the many-body screening of a local spin by a cloud of electrons at very low temperature. It has been proposed as an explanation of the zero-bias anomaly in quantum point contacts where interactions drive a spontaneous charge localization. However, the Kondo origin of this anomaly remains under debate, and additional experimental...
Article
We report on the noise properties of ion-irradiated YBa2Cu3O7 Josephson junctions. This work aims at investigating the linewidth of the Josephson oscillation with a detector response experiment at 132 GHz. Experimental results are compared with a simple analytical model based on the Likharev–Semenov equation and the de Gennes dirty limit approximat...
Article
Superconducting Quantum Interference Filters (SQIFs) are arrays of superconducting loops of different sizes including Josephson Junctions (JJ). For a random distribution of sizes, they present a non-periodic response to an applied magnetic field, with an extended linear regime and a sizable field sensitivity. Such properties make SQIFs interesting...
Poster
Full-text available
The French “Club nanoMétrologie”, created in 2011 by LNE and C’Nano (a program initiated by the CNRS, the CEA and the French Ministry of Research), organized by the end of 2013 the very first comparison at the national scale on AFM and SEM measurements of dimensional characteristics of 2D gratings (pitch and height). The aim of this comparison was...
Article
The emission from open cavities with non-integrable features remains a challenging problem of practical as well as fundamental relevance. Square-shaped dielectric microcavities provide a favorable case study with generic implications for other polygonal resonators. We report on a joint experimental and theoretical study of square-shaped organic mic...
Article
Full-text available
Ion beam shaping is a novel technique with which one can shape nano-structures that are embedded in a matrix, while simultaneously imposing their orientation in space. In this work, we demonstrate that the ion-shaping technique can be implemented successfully to engineer the morphology of hollow metallic spherical particles embedded within a silica...
Article
Full-text available
We present a method to fabricate top-gated field-effect devices in a LaAlO3/SrTiO3 two-dimensional electron gas (2-DEG). Prior to the gate deposition, the realisation of micron size conducting channels in the 2-DEG is achieved by an ion-irradiation with high-energy oxygen ions. After identifying the ion fluence as the key parameter that determines...
Article
We experimentally study superconducting YBa2Cu3O7 thin films with artificial vortex pinning arrays created via masked ion irradiation. In particular, we compare a series of arrays (2D periodic non-Bravais lattices) in which the density of pinning sites is nonuniform within the unit cell. The series consists of variants of a canonical array, which i...
Article
Full-text available
We present a tunnel spectroscopy study of single PbS Quantum Dots (QDs) as function of temperature and gate voltage. Three distinct signatures of strong electron-phonon coupling are observed in the Electron Tunneling Spectrum (ETS) of these QDs. In the shell-filling regime, the $8\times$ degeneracy of the electronic levels is lifted by the Coulomb...
Article
MnAs thin films present a phase coexistence of regularly arranged ferromagnetic (α) and paramagnetic (β) stripes below the Curie temperature when grown onto GaAs(100) substrates. In this letter, we report the observation of a magneto-structural phase transition induced by magnetic field on MnAs nanoribbons below the Curie temperature. A transformat...
Article
Full-text available
We report on experimental evidence of the Berry phase accumulated by the charge carrier wave function in single-domain nanowires made from a (Ga,Mn)(As,P) diluted ferromagnetic semiconductor layer. Its signature on the mesoscopic transport measurements is revealed as unusual patterns in the magnetoconductance, that are clearly distinguished from th...
Article
Full-text available
The recent development in the fabrication of artificial oxide heterostructures opens new avenues in the field of quantum materials by enabling the manipulation of the charge, spin and orbital degrees of freedom. In this context, the discovery of two-dimensional electron gases (2-DEGs) at LAlO3/SrTiO3 interfaces, which exhibit both superconductivity...
Article
Full-text available
In order to fill the gap of low-temperature and low-frequency noise field-effect transistors and to meet the needs in various experiments under deep cryogenic conditions, specially designed HEMTs with different gate capacitances have been fabricated and characterized at 4.2 and 77 K. At 4.2 K and with an appropriate gate capacitances, the obtained...
Article
Full-text available
We report on experiments with deformed polymer microlasers that have a low refractive index and exhibit unidirectional light emission. We demonstrate that the highly directional emission is due to transport of light rays along the unstable manifold of the chaotic saddle in phase space. Experiments, ray-tracing simulations, and mode calculations sho...
Article
We studied vortex dynamics in a YBa2Cu3O7-delta thin film with two different sources of pinning: intrinsic random defects and an artificial square array of defects created by masked ion irradiation. We study commensurability effects between the vortex lattice and the pinning array as a function of the vortex velocity v and the temperature. We find...
Article
Full-text available
We present a tunnel spectroscopy study of the electronic spectrum of single magnetite \chemform{Fe_3O_4} nanoparticles trapped between nanometer-spaced electrodes. The Verwey transition is clearly identified in the current voltage-characteristics where we find that the transition temperature is electric field dependent. The data show the presence o...
Article
Full-text available
We report on an experimental and theoretical study of the high-frequency mixing properties of ion-irradiated YBa2Cu3O7 Josephson junctions embedded in THz antennas. We investigated the influence of the local oscillator power and frequency on the device performances. The experimental data are compared with theoretical predictions of the general thre...
Article
The problem of an ensemble of repulsive particles on a potential-energy landscape is common to many physical systems and has been studied in multiple artificial playgrounds. However, the latter usually involve fixed energy landscapes, thereby impeding in situ investigations of the particles' collective response to controlled changes in the landscap...