A5012222646- Graphene research and applications
- Surface and Thin Film Phenomena
- Spectroscopy and Quantum Chemical Studies
- Physics of Superconductivity and Magnetism
- Electron and X-Ray Spectroscopy Techniques
- Thermal properties of materials
- Advanced Chemical Physics Studies
- Solid-state spectroscopy and crystallography
- Magnetic and transport properties of perovskites and related materials
- High-pressure geophysics and materials
- Carbon Nanotubes in Composites
- Chemical and Physical Properties of Materials
- Advanced Condensed Matter Physics
- Diamond and Carbon-based Materials Research
- Neurobiology and Insect Physiology Research
- Transition Metal Oxide Nanomaterials
- Nonlinear Optical Materials Research
- Photoreceptor and optogenetics research
- Nonlinear Optical Materials Studies
- Acoustic Wave Resonator Technologies
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Photorefractive and Nonlinear Optics
Silicon Austria Labs (Austria)
2023
University of Geneva
2021
Università Cattolica del Sacro Cuore
2008-2016
University of Groningen
2014
University of Trieste
2007
Nonlinear spectroscopy and microscopy techniques are ubiquitous in a wide range of applications across physics biology. However, these usually rely on high-powered pulsed laser systems. A promising alternative is to exploit entangled two-photon absorption (ETPA), which can lead tens orders magnitude lower incident flux rates than conventional (TPA) schemes. the role different degrees freedom ETPA was unclear following recent experimental studies, when compared earlier theoretical works....
The ultrafast thermal and mechanical dynamics of a two-dimensional lattice metallic nanodisks has been studied by near-infrared pump-probe diffraction measurements over temporal range spanning from $100\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ to several nanoseconds. experiments demonstrate that in these systems surface acoustic wave (SAW), with vector given the reciprocal periodicity array, can be excited $\ensuremath{\sim}120\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ Ti:sapphire laser pulses....
Thirty-five years ago, Sanders and Walton [Phys. Rev. B 15, 1489 (1977)] proposed a method to measure the phonon-magnon interaction in antiferromagnets through thermal transport which so far has not been verified experimentally. We show that dynamical variant of this approach allows direct extraction equilibration time, yielding 400 μs for cuprate spin-ladder system Ca(9)La(5)Cu(24)O(41). The present work provides general directly address spin-phonon by means experiments.
As is well-known, the character of π orbitals paramount importance for chemical properties carbon allotropes and their derived compounds. While at equilibrium nature these well understood, photoinduced nonequilibrium behavior under investigation. Here, we demonstrate that when a UV-laser pulse excites carrier density larger than 10% π* state in graphite, renormalization π-π* band gap takes place. This result has been achieved by detecting transient reflectivity associated decay time an...
The ferroelectric phase transition at ${T}_{C}=340\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ in (${{\mathrm{C}}_{6}{\mathrm{H}}_{5}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}{\mathrm{NH}}_{3}{)}_{2}\mathrm{CuCl}}_{4}$ is studied by means of temperature-dependent low-frequency Raman scattering, focusing on the coupling a low-energy librational mode to order parameter transition. Analysis symmetry and characteristics this links dipolar tilt angle organic cations. thermal evolution spectrum demonstrates...
We demonstrate that the electron density of light-populated image potential states in graphite reaches its maximum when photon energy ultrashort laser pulses is resonant with \ensuremath{\pi}\ensuremath{-}\ensuremath{\pi}* band gap at M point Brillouin zone. This unexpected behavior, as shown by nonlinear photoelectron spectroscopy data, assisted onset a strong light-induced interaction between \ensuremath{\pi} bands and states. finding suggests possibility exploring new photochemical...
The quantum efficiency (QE) of Cu(111) is measured for different impinging light angles with photon energies just above the work function. We observe that vectorial photoelectric effect, an enhancement QE due to illumination electric vector perpendicular sample surface, stronger in more surface sensitive regime. This can be explained by a contribution photoemission variation electromagnetic potential at surface. contributions bulk and electrons then determined.
The dynamics of excited charge carriers at the graphene/Ni(111) interface has been investigated by means time-resolved two-photon photoemission spectroscopy, employing femtosecond-XUV pulses with an energy 39.2 eV produced high-order-harmonic generation. Due to interplay substrate and adsorbate band structures, dependence lifetimes on $(E\ensuremath{-}{E}_{F})$ was found be similar that Ni $3d$ electrons measured for clean in range $(E\ensuremath{-}{E}_{F})<1$ eV, while it resembled...
Vision in living mice is sensitive to femtosecond pulse shaping.
Abstract Many-body interactions with the underlying bulk electrons determine properties of confined electronic states at surface a metal. Using momentum resolved nonlinear photoelectron spectroscopy we show that one can tailor these many-body in graphite, leading to strong renormalization dispersion and linewidth image potential state. These observations are interpreted terms basic self-energy model, may be considered as exemplary for optically induced interactions.
The dynamical fluorescent microthermal imaging (FMI) experiment has been used to investigate the phonon-magnon interaction in 1D Heisenberg antiferromagnet La5Ca9Cu24O41. This material shows highly anisotropic heat conductivity due efficient magnetic transport along spin ladders compound. To extract information on we modelled dynamic using a two temperature model approach, taking both crystal as well PMMA/EuTTA layer into account. simulations are carried out by finite element method COMSOL...
Lactate in humans is believed to provide unique information about the general health status of individual, including pressure ischemia and insufficient oxidative metabolism [1]. form Lactic acid widely used as an ingredient food, cosmetics, pharmaceuticals, requires development cost-effective methods for determination lactic human sweat [2]. Optical sensors based on surface plasmon resonance enable label-free optical biosensing method are detection various chemical biological species 2D...
Here we report the experimental evidence of interactions between excitations $π\toπ^*$ optical transition and image potential states (IPS) highly oriented pyrolitic graphite (HOPG). By using non-linear angle resolved photoelectron spectroscopy (NL-ARPES) show that IPS photoemission intensity, effective mass, linewidth exhibit a strong variation when photon energy is tuned across saddle points in 3.1 - 4.5 eV range. A model based on self-energy formalism proposed to correlate mass variations...