A5061452662- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Spectroscopy and Quantum Chemical Studies
- Molecular spectroscopy and chirality
- Nonlinear Optical Materials Research
- Magnetism in coordination complexes
- Carbon Nanotubes in Composites
- Mechanical and Optical Resonators
- Graphene research and applications
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Semiconductor materials and devices
- Magneto-Optical Properties and Applications
- Advanced NMR Techniques and Applications
- Random lasers and scattering media
- Crystallography and molecular interactions
- Conducting polymers and applications
- Advanced Condensed Matter Physics
- Quantum optics and atomic interactions
- Advanced Chemical Physics Studies
- Neural Networks and Reservoir Computing
- Optical Polarization and Ellipsometry
- Quantum and electron transport phenomena
Institut National des Sciences Appliquées de Toulouse
2004-2024
Centre National de la Recherche Scientifique
2014-2024
Laboratoire National des Champs Magnétiques Intenses
2013-2024
Université Grenoble Alpes
2013-2024
Université Toulouse III - Paul Sabatier
2006-2018
Université Joseph Fourier
2004-2015
CEA Grenoble
2013
Trinity College Dublin
2008
Max Planck Institute for Solid State Research
2008
Radboud University Nijmegen
1988-2008
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental investigations of organic molecular nonlinear optical polarizabilities. 1. Methods and results on benzene stilbene derivativesLap Tak Cheng, Wilson Tam, Sylvia H. Stevenson, Gerald R. Meredith, Geert Rikken, Seth MarderCite this: J. Phys. Chem. 1991, 95, 26, 10631–10643Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental investigations of organic molecular nonlinear optical polarizabilities. 2. A study conjugation dependencesLap Tak Cheng, Wilson Tam, Seth R. Marder, Albert E. Stiegman, Geert Rikken, and Charles W. SpanglerCite this: J. Phys. Chem. 1991, 95, 26, 10643–10652Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December...
Electrical conductors can be chiral, i.e., exist in two forms where one is the other's mirror image. Thus far, no effect of chirality on magnetotransport has been observed. We argue that electrical resistance any chiral conductor should depend linearly both external magnetic field and current through its handedness. suggest mechanisms to carry this show experimentally model systems are effective.
Raman scattering and photoluminescence (PL) emission are used to investigate a single layer of tungsten disulfide (WS${}_{2}$) obtained by exfoliating $n$-type bulk crystals. Direct gap with both neutral charged exciton recombination is observed in the low temperature PL spectra. The ratio between trion can be tuned simply varying excitation power. Moreover, intensity independently using additional subband laser excitation.
Carbon nanotubes are chiral molecular objects and therefore exist in two forms that each other’s mirror image. Many aspects of these fascinating new materials have recently been explored but their chirality has hardly addressed. We investigated the charge transport through individual single-walled carbon presence a magnetic field parallel to tube axis. For most tubes, dependence resistance is odd both current observed. This effect ascribed nanotube called electrical magneto-chiral anisotropy.
We report the experimental observation of strong electrical magnetochiral anisotropy in trigonal tellurium ($t$-Te) crystals. introduce tensorial character effect and determine several tensor elements. present a simple model based on band structure $t$-Te Boltzmann relaxation time approximation which gives reasonable description principal results.
Here we report the first experimental observation of magneto-chiral dichroism (MChD) detected through light absorption in an enantiopure lanthanide complex. The P and M enantiomers [YbIII((X)-L)(hfac)3] (X = P, M; L 3-(2-pyridyl)-4-aza[6]-helicene; hfac 1,1,1,5,5,5-hexafluoroacetylacetonate), where chirality is held by helicene-based ligand, were studied near-infrared spectral window. When irradiated with unpolarized a magnetic field, these chiral complexes exhibit strong MChD signal (gMChD...
Here, we report the molecular self-assembly of hydroxido-bridged {Ln5Ni6} ((Ln3+ = Dy3+, Y3+) metal clusters by reaction enantiopure chiral ligands, namely, (R/S)-(2-hydroxy-3-methoxybenzyl)-serine), with NiII and LnIII precursors. Single-crystal diffraction analysis reveals that these compounds are isostructural sandwich-like 3d–4f heterometallic showing helical chirality. Direct current magnetic measurements on {Dy5Ni6} indicates ferromagnetic coupling between DyIII centers, whereas those...
The combination of physical properties sensitive to molecular chirality in a single system allows the observation fascinating phenomena such as magneto-chiral dichroism (MChD) and circularly polarized luminescence (CPL) having potential applications for optical data readout display technology. Homochiral monodimensional coordination polymers Yb
Here we report on the strong magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption up to 5.0 T {Er5Ni6} metal clusters obtained by reaction of enantiopure chiral ligands NiII ErIII precursors. Single-crystal diffraction analysis reveals that these compounds are 3d–4f heterometallic clusters, showing helical chirality. MChD spectroscopy a high gMChD dissymmetry factor ca. 0.24 T–1 (T = 4.0 K, B 1.0 T) for 4I13/2 ← 4I15/2 magnetic-dipole allowed electronic...
In this paper we study the optical absorption of chiral media subject to a magnetic field parallel light. It is shown exhibit pure and cascaded magnetochiral anisotropy. We present experimental evidence for existence anisotropy in absorption.
In this Letter we prove the existence of a new general diffusive transport phenomenon in crossed electric and magnetic fields: magnetoelectric anisotropy. For specific case electrical transport, present relativistic model to quantify effect experimental evidence for its existence.
We report the observation of saturation with chain length second hyperpolarizability a series long, well-defined, conjugated oligothiophenes. This occurs at same as that band gap and polarizability, is attributed to effective conjugation length. Solvatochromic thermochromic measurements indicate conformational effects play role.
Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields ($>55\text{ }\text{ }\mathrm{T}$). We show that the peak separation is determined by Aharonov-Bohm phase due to tube-threading flux, which breaks time-reversal symmetry and lifts valley degeneracy. This field-induced breaking thus overcomes Coulomb-induced intervalley mixing predicted make lowest exciton state optically inactive (or dark).
We have used pulsed magnetic fields up to 60Tesla suppress the contribution of superconducting fluctuations(SCF)to conductivity above Tc in a series YBa2Cu3O6+x from deep pseudogapped state slight overdoping. Accurate determinations SCF versus temperature and field been achieved. Their joint quantitative analyses with respect Nernst data allow us establish that thermal fluctuations following Ginzburg-Landau(GL) scheme are dominant for nearly optimally doped samples. The deduced coherence...
We report on the enhanced optical properties of chiral magnetic nanohelices with critical dimensions comparable to ferromagnetic domain size. They are shown be at room temperature, have defined chirality, and exhibit large activity in visible as verified by electron microscopy, superconducting quantum interference device (SQUID) magnetometry, natural circular dichroism (NCD), (MCD) measurements. The structures magneto-chiral (MChD), which directly demonstrates coupling between their...
The interplay between chirality and magnetic fields gives rise to a cross effect referred as magneto-chiral anisotropy (MChA), which can manifest itself in different physical properties of chiral magnetized materials. first experimental demonstration MChA was by optical means with visible light. Further manifestations have been evidenced across most the electromagnetic spectrum, from terahertz X-rays. Moreover, exploiting versatility molecular chemistry toward systems, many efforts made...
The combination of chirality and magnetism has steadily grown over the last decennia into an area intense research. Magnetochiral anisotropy, chirality-induced spin-selectivity helimagnetism are most prominent phenomena resulting from this combination, touching different systems like topological (semi-)metals insulators, quantum magnets, type II multiferroics enantio-selective synthesis. As extension to area, we argue, based on symmetry arguments, that magnetochiral anisotropy will manifest...
Magnetic materials are widely used for many technologies in energy, health, transportation, computation, and data storage. For the latter, readout of magnetic state a medium is crucial. Optical based on magneto-optical Faraday effect was commercialized but soon abandoned because need complex circular polarization-sensitive readout. Combining chirality with magnetism can remove this obstacle, as chiral exhibit magneto-chiral dichroism, differential absorption unpolarized light dependent their...