A5056276928- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Mechanical and Optical Resonators
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Orbital Angular Momentum in Optics
- Cold Atom Physics and Bose-Einstein Condensates
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Particle Accelerators and Free-Electron Lasers
- 2D Materials and Applications
- Particle accelerators and beam dynamics
- Advanced Thermoelectric Materials and Devices
- Advanced X-ray and CT Imaging
- Radiation Therapy and Dosimetry
- Advanced X-ray Imaging Techniques
- Experimental and Theoretical Physics Studies
- Nuclear physics research studies
- Nuclear Physics and Applications
ETH Zurich
2018-2024
École Polytechnique Fédérale de Lausanne
2015-2016
Laboratoire de Physique Théorique de la Matière Condensée
2016
Queen's University
2001-2007
University of California, Irvine
2000
Princeton University
2000
National Research Council Canada
2000
University of Neuchâtel
1987-1991
California Institute of Technology
1991
Observations of neutral-current nu interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using neutral current (NC), elastic scattering, and charged reactions assuming standard 8B shape, nu(e) component solar flux is phis(e) = 1.76(+0.05)(-0.05)(stat)(+0.09)(-0.09)(syst) x 10(6) cm(-2) s(-1) for a kinetic energy threshold 5 MeV. The non-nu(e) phi(mu)(tau) 3.41(+0.45)(-0.45)(stat)(+0.48)(-0.45)(syst) s(-1), 5.3sigma greater than zero, providing strong evidence flavor...
Solar neutrinos from the decay of $^8$B have been detected at Sudbury Neutrino Observatory (SNO) via charged current (CC) reaction on deuterium and by elastic scattering (ES) electrons. The CC is sensitive exclusively to nu_e's, while ES also has a small sensitivity nu_mu's nu_tau's. flux nu_e's ^8B measured rate \phi^CC(nu_e) = 1.75 +/- 0.07 (stat)+0.12/-0.11 (sys.) 0.05(theor) x 10^6 /cm^2 s. Assuming no flavor transformation, inferred \phi^ES(nu_x) 2.39+/-0.34 (stat.)+0.16}/-0.14 (sys)...
The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra rates. For charged current events, assuming an undistorted 8B spectrum, the minus rate is 14.0%+/-6.3%(+1.5%)(-1.4%) of average rate. If total flux active neutrinos additionally constrained to have no asymmetry, nu(e) asymmetry found be 7.0%+/-4.9%(+1.3%)(-1.2%). A global analysis in terms matter-enhanced oscillations two flavors strongly favors large mixing angle solution.
The first hybrid phototransistors are reported where the performance of a network photoactive CH3NH3PbI3 nanowires is enhanced by CVD-grown monolayer graphene. These devices show responsivities as high ≈2.6 × 106 A W−1 in visible range, showing potential room-temperature single-electron detectors. Methylammonium lead iodide perovskite has revolutionized field third-generation solid-state solar cells leading to simple cell structures.1 and certified efficiencies up 20.1%.2 Recently peculiar...
Spatial positioning of nanocrystal building blocks on a solid surface is prerequisite for assembling individual nanoparticles into functional devices. Here, we report the graphoepitaxial liquid-solid growth nanowires photovoltaic compound CH3NH3PbI3 in open nanofluidic channels. The guided growth, visualized real-time with simple optical microscope, undergoes through metastable solvatomorph formation polar aprotic solvents. presently discovered crystallization leads to fabrication...
Integration of electrical contacts into van der Waals (vdW) heterostructures is critical for realizing electronic and optoelectronic functionalities. However, to date no scalable methodology gaining access buried monolayer two-dimensional (2D) semiconductors exists. Here we report viable edge contact formation hexagonal boron nitride (hBN) encapsulated MoS2. By combining reactive ion etching, in situ Ar+ sputtering annealing, achieve a relatively low resistance, high mobility (up ∼30 cm2 V–1...
This article provides the complete description of results from Phase I data set Sudbury Neutrino Observatory (SNO). The is based on a 0.65 kiloton-year exposure ${}^{2}{\mathrm{H}}_{2}$O (in following denoted as ${\mathrm{D}}_{2}$O) to solar $^{8}\mathrm{B}$ neutrino flux. Included here are details SNO physics and detector model, evaluations systematic uncertainties, estimates backgrounds. Also discussed SNO's approach statistical extraction signals three reactions (charged current, neutral...
We spatially expand and subsequently contract the motional thermal state of a levitated nanoparticle using hybrid trapping scheme. The particle's center-of-mass motion is initialized in (temperature 155 mK) an optical trap then expanded by subsequent evolution much softer Paul absence fields. demonstrate expansion state's standard deviation position factor 24. In our system, occurs devoid backaction from photon recoil, making this approach suitable for coherent wave function expansion.
Field-effect phototransistors were fabricated based on individual carbon nanotubes (CNTs) sensitized by CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> nanowires (MAPbI<sub>3</sub>NWs).
We present a hybrid trapping platform that allows us to levitate charged nanoparticle in high vacuum using either optical fields, radio-frequency or combination thereof. Our approach combines an dipole trap with linear Paul while maintaining large numerical aperture (0.77 NA). detail controlled transfer procedure use the as safety net recover particles lost from at vacuum. The presented adds toolbox of levitodynamics and represents important step towards fully controllable dark potentials,...
Levitated nanoparticles in vacuum are prime candidates for generating macroscopic quantum superposition states of massive objects. Most protocols preparing these necessitate coherent expansion beyond the scale zero-point motion to produce sufficiently delocalized and pure phase-space distributions. Here, we spatially expand subsequently recontract thermal state a levitated nanoparticle by modifying stiffness trap holding particle. We achieve state-expansion factors 25 standard deviation...
The absolute cross section of the $^{3}\mathrm{He}$(n,\ensuremath{\gamma}${)}^{4}$He reaction was measured at five energies between ${\mathit{E}}_{\mathit{n}}$=0.14--2.0 MeV to an accuracy \ensuremath{\sim}\ifmmode\pm\else\textpm\fi{}10%. \ensuremath{\sim}21 gamma rays produced in a $^{3}\mathrm{He}$ gas target were detected 90\ifmmode^\circ\else\textdegree\fi{} with respect beam direction. results are discussed light previous measurements two-body photodisintegration $^{4}\mathrm{He}$.
We present a hybrid trapping platform that allows us to levitate charged nanoparticle in high vacuum using either optical fields, radio-frequency or combination thereof. Our approach combines an dipole trap with linear Paul while maintaining large numerical aperture (0.77 NA). detail controlled transfer procedure use the as “safety net” recover particles lost from at vacuum. The presented adds toolbox of levitodynamics and represents important step towards fully controllable “dark”...