Physical Review Letters (Phys Rev Lett)
Journal description
Physical Review Letters is charged with providing rapid publication of short reports of important fundamental research in all fields of physics.
Current impact factor: 7.73
Impact Factor Rankings
2015 Impact Factor  Available summer 2015 

2013 / 2014 Impact Factor  7.728 
2012 Impact Factor  7.943 
2011 Impact Factor  7.37 
2010 Impact Factor  7.621 
2009 Impact Factor  7.328 
2008 Impact Factor  7.18 
Impact factor over time
Impact factor
Year
Additional details
5year impact  7.44 

Cited halflife  8.10 
Immediacy index  2.18 
Eigenfactor  1.09 
Article influence  3.61 
Website  Physical Review Letters website 
Other titles  Physical review letters online, PRL online 
ISSN  10797114 
OCLC  31492939 
Material type  Document, Periodical, Internet resource 
Document type  Internet Resource, Computer File, Journal / Magazine / Newspaper 
Publisher details

Preprint
 Author can archive a preprint version

Postprint
 Author can archive a postprint version

Conditions
 On author's personal website, employer's website or institutional repository
 Author's postprint on open repository
 Publisher's version/PDF may be used
 Link to publisher version required
 Publisher copyright and source must be acknowledged with citation
 Publisher last contacted on 29/02/2012
 Publisher last reviewed on 27/10/2014

Classification green
Publications in this journal

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ABSTRACT: The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on gammaray observations of Milky Way dSphs based on 6 years of Fermi Large Area Telescope data processed with the new Pass 8 eventlevel analysis. None of the dSphs are significantly detected in gamma rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass <∼ 100 GeV annihilating via quark and τ lepton channels.Physical Review Letters 03/2015; 
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ABSTRACT: We investigate the effect of H adsorption on the magnetic properties of individual Co atoms on Pt(111) with scanning tunneling microscopy. For pristine Co atoms, we detect no inelastic features in the tunnel spectra. Conversely, CoH and CoH2 show a number of lowenergy vibrational features in their differential conductance identified by isotope substitution. Only the fccadsorbed species present conductance steps of magnetic origin, with a field splitting identifying their effective spin as Seff=2 for CoH and 3/2 for CoH2. The exposure to H2 and desorption through tunnel electrons allow the reversible control of the spin in halfinteger steps. Because of the presence of the surface, the hydrogeninduced spin increase is opposite to the spin sequence of CoHn molecules in the gas phase.Physical Review Letters 03/2015; 114(10):106807. DOI:10.1103/PhysRevLett.114.106807 
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ABSTRACT: We present a molecular dynamics scheme which combines firstprinciples and machinelearning (ML) techniques in a single informationefficient approach. Forces on atoms are either predicted by Bayesian inference or, if necessary, computed by onthefly quantummechanical (QM) calculations and added to a growing ML database, whose completeness is, thus, never required. As a result, the scheme is accurate and general, while progressively fewer QM calls are needed when a new chemical process is encountered for the second and subsequent times, as demonstrated by tests on crystalline and molten silicon.Physical Review Letters 03/2015; 114(9):096405. 
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ABSTRACT: The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein's field equations. We show how this backreaction effect depends on shear and bulk viscosity and other material properties of the dark sector, as well as the spectrum of perturbations. If sufficiently large, this effect could account for the acceleration of the cosmological expansion.Physical Review Letters 03/2015; 114(9):091301. 
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ABSTRACT: We show that the lightmatter interaction in monolayer WSe_{2} is strongly enhanced when the incoming electromagnetic wave is in resonance with the energy of the exciton states of strongly Coulomb bound electronhole pairs below the electronic band gap. We perform second harmonic generation (SHG) spectroscopy as a function of laser energy and polarization at T=4 K. At the exciton resonance energies we record an enhancement by up to 3 orders of magnitude of the SHG efficiency, due to the unusual combination of electric dipole and magnetic dipole transitions. The energy and parity of the exciton states showing the strong resonance effects are identified in 1 and 2photon photoluminescence excitation experiments, corroborated by first principles calculations. Targeting the identified exciton states in resonant 2photon excitation allows us to maximize kvalley coherence and polarization.Physical Review Letters 03/2015; 114(9):097403. 
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ABSTRACT: In the construction of spectral manifolds in noncommutative geometry, a higher degree Heisenberg commutation relation involving the Dirac operator and the Feynman slash of real scalar fields naturally appears and implies, by equality with the index formula, the quantization of the volume. We first show that this condition implies that the manifold decomposes into disconnected spheres, which will represent quanta of geometry. We then refine the condition by involving the real structure and two types of geometric quanta, and show that connected spin manifolds with large quantized volume are then obtained as solutions. The two algebras M_{2}(H) and M_{4}(C) are obtained, which are the exact constituents of the standard model. Using the two maps from M_{4} to S^{4} the fourmanifold is built out of a very large number of the two kinds of spheres of Planckian volume. We give several physical applications of this scheme such as quantization of the cosmological constant, mimetic dark matter, and area quantization of black holes.Physical Review Letters 03/2015; 114(9):091302. 
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ABSTRACT: Trivalent americium has a nonmagnetic (J ¼ 0) ground state arising from the cancellation of the orbital and spin moments. However, magnetism can be induced by a large molecular field if Am3þ is embedded in a ferromagnetic matrix. Using the technique of xray magnetic circular dichroism, we show that this is the case in AmFe2. Since hJzi ¼ 0, the spin component is exactly twice as large as the orbital one, the total Am moment is opposite to that of Fe, and the magnetic dipole operator hTzi can be determined directly; we discuss the progression of the latter across the actinide series.Physical Review Letters 03/2015; 114(9):097203. DOI:10.1103/PhysRevLett.114.097203 
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ABSTRACT: Quantum mechanical decay, Fano interference, and bound states with energy in the continuum are ubiquitous phenomena in different areas of physics. Here we experimentally demonstrate that particle statistics strongly affects quantum mechanical decay in a multiparticle system. By considering propagation of twophoton states in engineered photonic lattices, we simulate quantum decay of two noninteracting particles in a multilevel FanoAnderson model. Remarkably, when the system sustains a bound state in the continuum, fractional decay is observed for bosonic particles, but not for fermionic ones. Complete decay in the fermionic case arises because of the Pauli exclusion principle, which forbids the bound state to be occupied by the two fermions. Our experiment indicates that particle statistics can tune manybody quantum decay from fractional to complete.Physical Review Letters 03/2015; 114(9):090201. 
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ABSTRACT: We report on harmonic generation experiments and calculations in air to investigate the theoretical prediction of Kolesik et al. [Opt. Lett. 35, 2550 (2010)] for testing the recently proposed higherorder Kerr effect model. Our observations show that although the fifthorder nonlinearity is nonnegligible, the overall defocusing effect via the higherorder nonlinearities is sufficiently small that plasma formation should be a main defocusing mechanism in high power filamentation. We also explore crossphase modulation via the optical Kerr effect, and find that the higherorder nonlinearities can significantly alter the phase matching of harmonic generation.Physical Review Letters 03/2015; 114(9):093901. 
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ABSTRACT: The exchange bias of antiferromagneticferromagnetic (AFMFM) bilayers is found to be strongly dependent on the ferromagnetic spin configuration. The widely accepted inverse proportionality of the exchange bias field with the ferromagnetic thickness is broken in FM layers thinner than the FM correlation length. Moreover, an anomalous thermal dependence of both exchange bias field and coercivity is also found. A model based on springlike domain walls parallel to the AFMFM interface quantitatively accounts for the experimental results and, in particular, for the deviation from the inverse proportionality law. These results reveal the active role the ferromagnetic spin structure plays in AFMFM hybrids which leads to a new paradigm of the exchange bias phenomenon.Physical Review Letters 03/2015; 114(9):097202. 
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ABSTRACT: Discovery of new transition metal compounds with large spin orbit coupling coexisting with strong electronelectron correlation among the d electrons is essential for understanding the physics that emerges from the interplay of these two effects. In this study, we predict a novel class of J_{eff}=1/2 Mott insulators in a family of fluoride compounds that are previously synthesized, but not characterized extensively. First principles calculations in the level of all electron density functional theory+dynamical mean field theory indicate that these compounds have large Mott gaps and some of them exhibit unprecedented proximity to the ideal, SU(2) symmetric J_{eff}=1/2 limit.Physical Review Letters 03/2015; 114(9):096403. 
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ABSTRACT: Manybody theory is developed to calculate the γ spectra for positron annihilation in noblegas atoms. Inclusion of electronpositron correlation effects and core annihilation gives spectra in excellent agreement with experiment [K. Iwata et al., Phys. Rev. Lett. 79, 39 (1997)]. The calculated correlation enhancement factors γ_{nl} for individual electron orbitals nl are found to scale with the ionization energy I_{nl} (in eV), as γ_{nl}=1+sqrt[A/I_{nl}]+(B/I_{nl})^{β}, where A≈40 eV, B≈24 eV, and β≈2.3.Physical Review Letters 03/2015; 114(9):093201. 
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ABSTRACT: Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e^{+}e^{}→ωχ_{cJ} (J=0, 1, 2). The process e^{+}e^{}→ωχ_{c0} is observed for the first time, and the Born cross sections at sqrt[s]=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5) pb, respectively, where the first uncertainties are statistical and the second are systematic. The ωχ_{c0} signals at the other seven energies and the e^{+}e^{}→ωχ_{c1} and ωχ_{c2} signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχ_{c0} cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e^{+}e^{}→π^{+}π^{}J/ψ. Assuming the ωχ_{c0} signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6) MeV/c^{2} and (38±12±2) MeV, respectively, and the statistical significance is more than 9σ.Physical Review Letters 03/2015; 114(9):092003.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.