5,676 research outputs found
Inelastic neutron scattering and muon spin relaxation investigations of the deuterated Kondo lattices CeNiSnD x
The dissipation of the system and the atom in two-photon Jaynes-Cummings model with degenerate atomic levels
The method of perturbative expansion of master equation is employed to study
the dissipative properties of system and of atom in the two-photon
Jaynes-Cummings model (JCM) with degenerate atomic levels. The numerical
results show that the degeneracy of atomic levels prolongs the period of
entanglement between the atom and the field. The asymptotic value of atomic
linear entropy is apparently increased by the degeneration. The amplitude of
local entanglement and disentanglement is suppressed. The better the initial
coherence property of the degenerate atom, the larger the coherence loss.Comment: 11 pages, 4 figure
Existence of periodic solution for generalized neutral Rayleigh equation with variable parameter
Emergent spin-glass state in the doped Hund's metal CsFe2As2
Hund's metal is one kind of correlated metal, in which the electronic
correlation is strongly influenced by the Hund's interaction. At high
temperatures, while the charge and orbital degrees of freedom are quenched, the
spin degrees of freedom can persist in terms of frozen moments. As temperature
decreases, a coherent electronic state with characteristic orbital
differentiation always emerges at low temperatures through an
incoherent-to-coherent crossover, which has been widely observed in iron-based
superconductors (e.g., iron selenides and AFe2As2 (A = K, Rb, Cs)).
Consequently, the above frozen moments are "screened" by coupling to orbital
degrees of freedom, leading to an emergent Fermi-liquid state. In contrast, the
coupling among frozen moments should impede the formation of the Fermi-liquid
state by competitive magnetic ordering, which is still unexplored in Hund's
metal. Here, in the iron-based Hund's metal CsFe2As2, we adopt a chemical
substitution at iron sites by Cr/Co atoms to explore the competitive magnetic
ordering. By a comprehensive study of resistivity, magnetic susceptibility,
specific heat and nuclear magnetic resonance, we demonstrate that the
Fermi-liquid state is destroyed in Cr-doped CsFe2As2 by a spinfreezing
transition below T_g ~ 22 K. Meanwhile, the evolution of charge degrees of
freedom measured by angle-resolved photoemission spectroscopy also supports the
competition between the Fermi-liquid state and spin-glass state.Comment: 21 pages, 7 figure
A Unified Approach to the Classical Statistical Analysis of Small Signals
We give a classical confidence belt construction which unifies the treatment
of upper confidence limits for null results and two-sided confidence intervals
for non-null results. The unified treatment solves a problem (apparently not
previously recognized) that the choice of upper limit or two-sided intervals
leads to intervals which are not confidence intervals if the choice is based on
the data. We apply the construction to two related problems which have recently
been a battle-ground between classical and Bayesian statistics: Poisson
processes with background, and Gaussian errors with a bounded physical region.
In contrast with the usual classical construction for upper limits, our
construction avoids unphysical confidence intervals. In contrast with some
popular Bayesian intervals, our intervals eliminate conservatism (frequentist
coverage greater than the stated confidence) in the Gaussian case and reduce it
to a level dictated by discreteness in the Poisson case. We generalize the
method in order to apply it to analysis of experiments searching for neutrino
oscillations. We show that this technique both gives correct coverage and is
powerful, while other classical techniques that have been used by neutrino
oscillation search experiments fail one or both of these criteria.Comment: 40 pages, 15 figures. Changes 15-Dec-99 to agree more closely with
published version. A few small changes, plus the two substantive changes we
made in proof back in 1998: 1) The definition of "sensitivity" in Sec. V(C).
It was inconsistent with our actual definition in Sec. VI. 2) "Note added in
proof" at end of the Conclusio
Partial wave analysis of J/psi to p pbar pi0
Using a sample of 58 million events collected with the BESII
detector at the BEPC, more than 100,000 events are
selected, and a detailed partial wave analysis is performed. The branching
fraction is determined to be . A long-sought `missing' , first observed in , is observed in this decay too, with mass and width of
MeV/c and MeV/c,
respectively. Its spin-parity favors . The masses, widths, and
spin-parities of other states are obtained as well.Comment: Add one author nam
City-level water withdrawal and scarcity accounts of China
In the context of China’s freshwater crisis high-resolution data are critical for sustainable water management and economic growth. Yet there is a dearth of data on water withdrawal and scarcity regardless of whether total or subsector amount, for prefectural cities. In administrative and territorial scope, we accounted for water withdrawal of all 63 economic-socio-environmental sectors for all 343 prefectural cities in China, based on a general framework and 2015 data. Spatial and economic-sector resolution is improved compared with previous studies by partitioning general sectors into industrial and agricultural sub-sectors. Construction of these datasets was based on selection of 16 driving forces. We connected a size indicator with corresponding water-withdrawal efficiency. We further accounted for total blue-water withdrawal and quantitative water scarcity status. Then we compared different scopes and methods of official accounts and statistics from various water datasets. These disaggregated and complete data could be used in input-output models for municipal design and governmental planning to help gain in-depth insights into subsector water-saving priorities from local economic activities
Parallel momentum distribution of the Si fragments from P
Distribution of the parallel momentum of Si fragments from the breakup
of 30.7 MeV/nucleon P has been measured on C targets. The distribution
has the FWHM with the value of 110.5 23.5 MeV/c which is consistent
quantitatively with Galuber model calculation assuming by a valence proton in
P. The density distribution is also predicted by Skyrme-Hartree-Fock
calculation. Results show that there might exist the proton-skin structure in
P.Comment: 4 pages, 4 figure
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