A5013790687- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- 2D Materials and Applications
- Optical properties and cooling technologies in crystalline materials
- Atomic and Subatomic Physics Research
- Advanced Optical Sensing Technologies
- Molecular Junctions and Nanostructures
- Nanowire Synthesis and Applications
- Copper-based nanomaterials and applications
- Silicon Nanostructures and Photoluminescence
- Spectroscopy and Laser Applications
- Graphene research and applications
- Nonlinear Optical Materials Studies
- Electromagnetic Compatibility and Measurements
- Advanced Frequency and Time Standards
Centre National de la Recherche Scientifique
2017-2021
Sorbonne Université
2017-2021
Institut des NanoSciences de Paris
2017-2021
Délégation Paris 6
2020
University of Cambridge
2020
Université Paris 1 Panthéon-Sorbonne
2018-2019
Institut National de Santé Publique
2018
Délégation Ile-de-France Villejuif
2018
Single-photon detection with high efficiency, timing resolution, low dark counts and photon detection-rates is crucial for a wide range of optical measurements. Although efficient detectors have been reported before, combining all performance parameters in single device remains challenge. Here, we show broadband NbTiN superconducting nanowire detector an efficiency exceeding 92%, over 150MHz detection-rate, count-rate below 130Hz, operated Gifford-McMahon cryostat. Furthermore, careful...
Electron–hole exchange energy,<italic>J</italic>, rules the exciton fine structure splittings in CsPbBr<sub>3</sub>single nanocrystals.
We have performed micro-photoluminescence measurements on a single CsPbBr3 nanocrystal (NC) with size comparable to the Bohr diameter (7 nm). When NC has an orthorhombic crystal symmetry, we observe exciton fine structure composed of three peaks linearly polarized. took advantage polarization properties monitor in situ both energy and linewidth individual when increasing temperature. reveal that two regimes exist, at low high temperature, which are dominated by acoustic or longitudinal...
Colloidal 2D nanoplatelets (NPLs) are a class of nanoparticles that offer the possibility forming two types heterostructures, by growing either in confined direction or perpendicular to direction, called core/crown NPLs. Here, we demonstrate bicolor emission can be obtained from NPLs with geometry. To date, for CdSe/CdTe type-II band alignment, only charge transfer has been observed due very fast (<picoseconds) electrons toward CdSe core. show using CdSe1–xTex alloys crowned right...
Heterostructured two-dimensional colloidal nanoplatelets are a class of material that has attracted great interest for optoelectronic applications due to their high photoluminescence yield, atomically tunable thickness, and ultralow lasing thresholds. Of particular laterally heterostructured core-crown with type-II band alignment, where the in-plane spatial separation carriers leads indirect (or charge transfer) excitons long lifetimes bright, highly Stokes shifted emission. Despite this,...
Germanane is a two-dimensional, strongly confined form of germanium. It presents an interesting combination (i) ease integration with CMOS technology, (ii) low toxicity, and (iii) electronic confinement which transforms the indirect bandgap bulk material into direct featuring photoluminescence. However, optoelectronic properties this remain far less investigated than its structural properties. Here, we investigate photoluminescence transport arrays methyl-terminated germanane flakes. The...
Type-II heterostructures are key elementary components in optoelectronic, photovoltaic, and quantum devices. The staggered band alignment of materials leads to the stabilization indirect excitons (IXs), i.e., correlated electron–hole pairs experiencing spatial separation with novel properties, boosting optical gain promoting strategies for design information storage, charge separation, or qubit manipulation Planar colloidal CdSe/CdTe core–crown type-II nested structures, grown as...
We synthesized strongly anisotropic CsPbBr3 nanocrystals with very narrow emission and absorption lines associated to confinement effects along one or two dimensions, called respectively nanoplatelets (NPLs) nanosticks (NSTs). Transmission Electron Microscopy (TEM) images, photoluminescence (PL) spectra taken at low temperature are precise tools determine which kind of has be considered deduce the shape, size thickness under focus. show that energy band-edge PL peaks versus inverse square...
Luminescent colloidal CdSe nanorings are a new type of semiconductor structure that have attracted interest due to the potential for unique physics arising from their non-trivial toroidal shape. However, exciton properties and dynamics these materials with complex topology not yet well understood. Here, we use combination femtosecond vibrational spectroscopy, temperature-resolved photoluminescence (PL), single particle measurements study materials. We find on transformation nanoplatelets...
Single-photon detectors with high efficiency, time resolution, low dark counts and photon detection-rates are vital for most demanding quantum optics experiments. Combining all performances in a single device has been challenging. Here, we demonstrate broadband detector efficiency higher than 92%, over 150 MHz detection-rate below 130 Hz operated conventional Gifford-McMahon cryostat. Furthermore, using our custom made cryogenic amplifiers optimized detector, reach record jitter of 14.80 ps...
Colloidal 2D nanoplatelets (NPLs) are a class of nanoparticles that offer the possibility forming two types heterostructures, by growing either in confined direction or perpendicular to direction, called core/crown NPLs. Here, we demonstrate bicolor emission can be obtained from NPLs with geometry. To date, for CdSe/CdTe type-II band alignment, only charge transfer has been observed due very fast (<picoseconds) electrons toward CdSe core. show using CdSe1–xTex alloys crowned right...
ADVERTISEMENT RETURN TO ISSUEPREVAdditions and Correc...Additions CorrectionsNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to Optical Electronic Properties of Colloidal CdSe Quantum RingsJames XiaoJames XiaoCavendish Laboratory, University Cambridge, J.J. Thomson Avenue, CB3 0HE United KingdomMore by James Xiao, Yun LiuYun LiuCavendish Liuhttp://orcid.org/0000-0003-1630-4052, Violette SteinmetzViolette SteinmetzSorbonne Université, CNRS-UMR 7588, Institut des NanoSciences de...