A5026086607- Metabolism and Genetic Disorders
- Perovskite Materials and Applications
- Pulmonary Hypertension Research and Treatments
- Glycogen Storage Diseases and Myoclonus
- Surface and Thin Film Phenomena
- Biochemical and Molecular Research
- Autoimmune Bullous Skin Diseases
- Bone health and treatments
- Quantum Dots Synthesis And Properties
- Congenital Heart Disease Studies
- Parathyroid Disorders and Treatments
- Porphyrin Metabolism and Disorders
- Hemoglobinopathies and Related Disorders
- Diabetes and associated disorders
- Thyroid Disorders and Treatments
- Cytomegalovirus and herpesvirus research
- Urticaria and Related Conditions
- Cancer, Hypoxia, and Metabolism
- Quantum and electron transport phenomena
- Hereditary Neurological Disorders
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Folate and B Vitamins Research
- Neonatal Health and Biochemistry
- Pituitary Gland Disorders and Treatments
- Vasculitis and related conditions
IBM Research - Zurich
2018-2024
ETH Zurich
2014-2022
Max Planck Institute for the Science of Light
2022
Saarland University
2009-2011
Kiel University
2006-2010
University Hospital of Zurich
2009
University of Chicago Medical Center
2009
Shriners Hospitals for Children - Erie
2009
University of Chicago
1989
University of California, San Diego
1973-1974
While lean Mg–Zn–Ca alloys are promising materials for temporary implants, questions remain on the impact of Zn and Ca microstructure. In this context, precipitation in Mg-1.5Zn-0.25Ca (in wt.%), initially extruded at 330°C, towards Mg–Ca binary precipitates or Ca–Mg–Zn ternary was probed a multiscale correlative approach using atom probe tomography (APT) analytical transmission electron microscopy (TEM). Particular focus set precipitate phase whose structure is debated. as-extruded...
Fully-inorganic cesium lead halide perovskite nanocrystals (NCs) have shown to exhibit outstanding optical properties such as wide spectral tunability, high quantum yield, oscillator strength well blinking-free single photon emission and low diffusion. Here, we report measurements of the coherent incoherent exciton dynamics on 100 fs 10 ns timescale, determining dephasing density decay rates in these NCs. The experiments are performed CsPbBr$_{2}$Cl NCs using transient resonant three-pulse...
Colloidal nanoplatelets (NPLs) are atomically flat, quasi-two-dimensional particles of a semiconductor. Despite intense interest in their optical properties, several observations concerning the emission CdSe NPLs remain puzzling. While ensemble photoluminescence spectrum consists single narrow peak at room temperature, two distinct features appear temperatures below ∼160 K. Several competing explanations for origin this two-color have been proposed. Here, we present temperature- and...
Abstract Microcavities with embedded optically active materials allow to create exciton–polariton condensates in the strong light–matter interaction regime. These exhibit quantum fluid properties up room temperature, and, when crystal-like lattices are imprinted cavity, they can be used emulate and study solid-state physics toy models. Here, we demonstrate temperature polariton condensation a nano-fabricated two-dimensional Lieb lattice an organic polymer. We exploit tunability of our open...
The conductance of oriented C60 molecules on Au(111) and Cu(100) was investigated using a low-temperature scanning tunnelling microscope. A remarkable dependence spectra the differential adsorption orientation is observed for that almost absent Cu(100). For adsorbed Au(111), spatial distribution three lowest unoccupied molecular orbitals revealed by maps conductance.
A common signature of nearly all nanoscale emitters is fluorescence intermittency, which a rapid switching between "on"-states exhibiting high photon emission rate and "off"-states with much lower rate. One consequence intermittency occurring on time scales longer than the exciton decay so-called delayed emission, manifested by long radiative component. Besides their dominant fast decay, fully inorganic cesium lead halide perovskite quantum dots exhibit component at cryogenic temperatures...
Variations of the spectra plasmonic light emitted from junction a scanning tunneling microscope have been observed for different lateral positions tip on Au(111) surface. Subnanometer spatial variations emission intensity over triangular island and in vicinity surface step edges recorded at photon energies. They reveal standing wave patterns characteristic two-dimensional confined electrons.
Quantum well states in thin Pb(111) metal films on Ag(111) surfaces were investigated using low-temperature scanning tunneling spectroscopy. Quantitative analysis of the spectra yields bulk-band dispersion $\ensuremath{\Gamma}\text{-L}$ direction, scattering phase shifts at interface and vacuum barrier as lifetime broadening.
Purine metabolism has been examined in a clonal line of mouse neuroblastoma cells resistant to the cytotoxic effects 6-thioguanine. Comparative studies and parental lines indicate that former have less than 1% normal hypoxanthine phosphoribosyltransferase (EC 2.4.2.8) activity. The activities other enzymes important de novo salvage pathways purine biosynthesis were not significantly different two lines. Hypoxanthine deficiency this was associated with increased intracellular concentrations...
Lead halide perovskite quantum dots (QDs), the latest generation of colloidal QD family, exhibit outstanding optical properties, which are now exploited as both classical and light sources. Most their rather exceptional properties related to peculiar exciton fine-structure band-edge states, can support unique bright triplet excitons. The degeneracy excitons is lifted with energetic splitting in order millielectronvolts, be resolved by photoluminescence (PL) measurements single QDs at...
The apparent height of the tunneling barrier in scanning microscopy measured on Au(111), Ag(111), and Cu(111) surfaces is found to vary significantly with bias voltage. In particular, ${\ensuremath{\phi}}_{a}$ asymmetric respect polarity all three surfaces, contrast simple interpretations terms an average work function tip sample. Model calculations current, which take band-structure effects into account, describe experimental observations.
We present a quantitative many-body analysis using the $GW$ approximation of decay rate $\ensuremath{\Gamma}$ due to electron-electron scattering excitations in Shockley surface state band Ag(111), as measured scanning tunneling microscope (STM). The calculations include perturbing influence STM, which causes Stark-shift energy $E$ and concomitant increase $\ensuremath{\Gamma}$. find varies more rapidly with than recently found for image potential states, where STM has been shown...
A yet unknown surface reconstruction of V3Si(001), which is most likely induced by carbon, used to investigate the quasi-particle energy gap at atomic scale a cryogenic scanning tunneling microscope. The width was virtually not altered and close carbon impurities, nor did it change different sites reconstructed lattice. remarkable modification spectroscopic signature induced, however, upon moving tip microscope into controlled contact with superconductor. Spectroscopy resulting normal-metal...
Scanning tunneling microscopy measurements of the apparent height barrier are analyzed for Pb islands on Ag(111). The (ABH) significantly varies with bias voltage. This dependence leads to drastic changes and even inversion contrast in spatial maps ABH. Using model calculations, these variations interpreted terms strongly modulated local density states thin films, which is caused by quantum well states.
The contact formation of a metallic tip approaching Pb thin films supported on Ag(111) substrates is investigated with cryogenic scanning tunnelling microscope. Although contacts to thicker are formed rather abruptly, the transition between and gradual for first monolayer Ag(111). This behaviour may be understood in terms different vertical bonding strengths due charge-transfer-induced surface dipole. Owing evolution tip–surface Pb(111) monolayer, imaging can performed at contact....