A5059616477- Spectroscopy and Quantum Chemical Studies
- Photorefractive and Nonlinear Optics
- Advanced X-ray Imaging Techniques
- Force Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Advancements in Battery Materials
- Molecular Junctions and Nanostructures
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Solid-state spectroscopy and crystallography
- Advanced Battery Materials and Technologies
- Surface and Thin Film Phenomena
- Advanced Electrical Measurement Techniques
- Magneto-Optical Properties and Applications
- Terahertz technology and applications
- Crystallography and Radiation Phenomena
- Advanced Battery Technologies Research
- Spectroscopy and Laser Applications
- Magnetic properties of thin films
- Mechanical and Optical Resonators
École Normale Supérieure - PSL
2021-2023
École Normale Supérieure
2020-2022
Laboratoire de Géologie de l’École Normale Supérieure
2021
Solid-state electrolytes overcome many challenges of present-day lithium ion batteries, such as safety hazards and dendrite formation1,2. However, detailed understanding the involved dynamics is missing due to a lack in operando measurements with chemical interfacial specificity. Here we investigate prototypical solid-state electrolyte using linear nonlinear extreme-ultraviolet spectroscopies. Leveraging surface sensitivity extreme-ultraviolet-second-harmonic-generation spectroscopy,...
The coexistence of ferroelectricity and metallicity seems paradoxical, since the itinerant electrons in metals should screen long-range dipole interactions necessary for ordering. recent discovery polar metal LiOsO3 was therefore surprising [as discussed earlier Y. Shi et al., Nat. Mater. 2013, 12, 1024]. It is thought that coordination preferences Li play a key role stabilizing phase, but an investigation from combined viewpoints core-state specificity symmetry has yet to be done. Here, we...
Second harmonic generation (SHG) is a unique non-linear optical effect that can be used to investigate chemical states of molecules at surfaces/interfaces. By the use soft X-rays, SHG gains element selectivity through inner-core excitation resonance. However, it challenging observe signals separately from second-order light generated undulator. Here, we report new ellipsometry method for X-ray suppress contribution second-harmonic radiation source. Through measurements GaAs(100) crystal,...
We developed the ellipsometer unit with a switchable mirror holder that can mount two mirrors and switch them without breaking vacuum. The vacuum unit, combined differential pumping rotary flange, rotates smoothly help of roll-stands, keeping optical path stable during an experiment ellipsometry. system allows one to efficiently make measurement at different photon energies soft X-ray. Thus, it is useful, for example, in experiments resonant magneto-optical Kerr effect on multi-element...
Noisy voltage sources can be a limiting factor for fundamental physics experiments as well device applications in quantum information, mesoscopic circuits, magnetometry, and other fields. The best commercial DC programmed to approximately six digits have intrinsic noise the microvolt range. On hand level metrological Josephson-junction based standards is sub-femtovolt. Although such considered "noiseless," they are generally not designed continuous tuning of output nor supplying current load...
Ferroelectric materials contain a switchable spontaneous polarization that persists even in the absence of an external electric field. The coexistence ferroelectricity and metallicity material appears to be illusive, since is ill-defined metals, where itinerant electrons are expected screen long-range dipole interactions necessary for ordering. surprising discovery polar metal, LiOsO3 has generated interest searching new metals motivated by prospects exotic quantum phenomena such as...
Second harmonic generation (SHG) spectroscopy ubiquitously enables the investigation of surface chemistry, interfacial as well symmetry properties in solids. Polarization-resolved SHG visible to infrared regime is regularly used investigate electronic and magnetic order through their angular anisotropies within crystal structure. However, increasing complexity novel materials emerging phenomena hampers interpretation experiments solely based on hybridized valence states. Here,...