55,044 research outputs found
Probing Lorentz Invariance Violation with Neutrino Factories
In this article we show the modification in the number of neutrino events
() caused by Lorentz Invariant Violation (LIV),
and , in neutrino oscillation for a
neutrino factory at a distance of 7500 km. The momentum of the muons can vary
from 10-50 GeV and we consider decays per year. The
modifications in the number of events caused by this LIV parameter
could be a strong signal of new physics in a future neutrino factory.Comment: 8 pages, 6 figures. Several improvements in the text. New references
added. Improvements in the discussions and conclusion
Field-induced Coulomb coupling in semiconductor macroatoms: application to "single-electron" quantum devices
A novel approach for the control of exciton-exciton Coulomb coupling in
semiconductor macroatoms/molecules is proposed. We show that by applying
properly tailored external fields, we can induce ---or significantly
reinforce--- excitonic dipoles, which in turn allows to control and magnify
intra- as well as inter-dot few-exciton effects. Such dipole-dipole interaction
mechanism will be accounted for within a simple analytical model, which is
found to be in good agreement with fully three-dimensional calculations. The
proposed approach may play an important role for the design and realization of
fully-optical quantum gates as well as ultrafast optical switches
A RECONSTRUCTION OF THE GREEK-ROMAN REPEATING CATAPULT
An “automatic” repeating weapon used by the Roman army is presented. Firstly a short description is shown of the working principle of the torsion motor that powered the Greek-Roman catapults. This is followed by the description of the reconstructions of these ancient weapons made by those scientists who studied repeating catapults. The authors then propose their own reconstruction. The latter differs from the previous ones because it proposes a different working cycle that is almost automatic and much safer for the operators. The authors based their reconstruction of the weapon starting from the work of previous scientists and on their own translation of the original text (in ancient Greek) by Philon of Byzantium
Electron-phonon coupling in metallic carbon nanotubes: Dispersionless electron propagation despite dissipation
A recent study [Rosati, Dolcini, and Rossi, Appl. Phys. Lett. 106, 243101
(2015)] has predicted that, while in semiconducting single-walled carbon
nanotubes (SWNTs) an electronic wave packet experiences the typical spatial
diffusion of conventional materials, in metallic SWNTs its shape remains
essentially unaltered up to micron distances at room temperature, even in the
presence of the electron-phonon coupling. Here, by utilizing a Lindblad-based
density-matrix approach enabling us to account for both dissipation and
decoherence effects, we test such prediction by analyzing various aspects that
were so far unexplored. In particular, accounting for initial nonequilibrium
excitations, characterized by an excess energy , and including both intra-
and interband phonon scattering, we show that for realistically high values of
the electronic diffusion is extremely small and nearly independent of its
energetic distribution, in spite of a significant energy-dissipation and
decoherence dynamics. Furthermore, we demonstrate that the effect is robust
with respect to the variation of the chemical potential. Our results thus
suggest that metallic SWNTs are a promising platform to realise quantum
channels for the non-dispersive transmission of electronic wave packets.Comment: 14 pages, 7 figure
Coherent phenomena in semiconductors
A review of coherent phenomena in photoexcited semiconductors is presented.
In particular, two classes of phenomena are considered: On the one hand the
role played by optically-induced phase coherence in the ultrafast spectroscopy
of semiconductors; On the other hand the Coulomb-induced effects on the
coherent optical response of low-dimensional structures.
All the phenomena discussed in the paper are analyzed in terms of a
theoretical framework based on the density-matrix formalism. Due to its
generality, this quantum-kinetic approach allows a realistic description of
coherent as well as incoherent, i.e. phase-breaking, processes, thus providing
quantitative information on the coupled ---coherent vs. incoherent--- carrier
dynamics in photoexcited semiconductors.
The primary goal of the paper is to discuss the concept of quantum-mechanical
phase coherence as well as its relevance and implications on semiconductor
physics and technology. In particular, we will discuss the dominant role played
by optically induced phase coherence on the process of carrier photogeneration
and relaxation in bulk systems. We will then review typical field-induced
coherent phenomena in semiconductor superlattices such as Bloch oscillations
and Wannier-Stark localization. Finally, we will discuss the dominant role
played by Coulomb correlation on the linear and non-linear optical spectra of
realistic quantum-wire structures.Comment: Topical review in Semiconductor Science and Technology (in press)
(Some of the figures are not available in electronic form
Characterisation of the fused silica surface quality with a β-source
A method to characterise the quality of a fused silica surface using a β-source is presented. Two fused silica bars (5×10×400mm3) were fabricated for the Cherenkov detector for proton Flux Measurement installed at vacuum chamber of the Super Proton Synchrotron at CERN. The resolution of such device is defined by the collection efficiency of the Cherenkov light, which is produced by relativistic charged particles in the fused silica. Thus, the surface quality of the radiator should be as good as possible to avoid light losses. The method is based on the scanning of the radiator surface with a90Sr radioactive source and measurements of the Cherenkov light rate, detected by a PMT attached to the quartz bars. The data have been compared with a Monte-Carlo simulation, providing an estimation of the radiator's probability of the total internal reflection and inefficient area at the edges of the bars
Strong exciton binding in quantum structures through remote dielectric confinement
We propose a new type of hybrid systems formed by conventional semiconductor
nanostructures with the addition of remote insulating layers, where the
electron-hole interaction is enhanced by combining quantum and dielectric
confinement over different length scales. Due to the polarization charges
induced by the dielectric mismatch at the semiconductor/insulator interfaces,
we show that the exciton binding energy can be more than doubled. For
conventional III-V quantum wires such remote dielectric confinement allows
exciton binding at room temperature.Comment: 4 pages, 3 PostScript figures embedded, best printed in color. Uses
RevTex, multicol, and psfig styles. To appear in Phys. Rev. Let
Scalar Dark Matter in light of LEP and ILC Experiments
In this work we study a scalar field dark matter model with mass of the order
of 100 MeV. We assume dark matter is produced in the process , that, in fact, could be a background for the standard process
extensively studied at LEP. We constrain the
chiral couplings, and , of the dark matter with electrons through an
intermediate fermion of mass GeV and obtain and
for the best fit point of our analysis. We also
analyze the potential of ILC to detect this scalar dark matter for two
configurations: (i) center of mass energy GeV and luminosity
fb, and (ii) center of mass energy TeV
and luminosity fb. The differences of polarized beams
are also explored to better study the chiral couplings.Comment: 15 pages, 6 figures and 1 table. New references added and
improvements in the text. Conclusions unchange
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