Journal Article

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2018-06-19
16:20
[PUBDB-2018-02334] Journal Article
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Correction exponents in the Gross–Neveu–Yukawa model at $$1/N^2$$1/N2
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2018-06-18
16:24
OpenAccess [PUBDB-2018-02323] Journal Article
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Validity of Padé approximations in vacuum polarization at three- and four-loop order
The heavy-quark contribution to the polarization function Π at higher perturbative orders is presently only known approximately. We scrutinize the accuracy of state-of-the-art approximations at three- and four-loop order [...]
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2018-06-18
16:16
[PUBDB-2018-02322] Journal Article
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Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S.
The diffuse very high-energy (VHE; >100 GeV) γ-ray emission observed in the central 200 pc of the Milky Way by H.E.S.S. was found to follow dense matter distribution in the central molecular zone (CMZ) up to a longitudinal distance of about 130 pc to the Galactic centre (GC), where the flux rapidly decreases [...]
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2018-06-18
16:05
[PUBDB-2018-02321] Journal Article
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Limits on the flux of tau neutrinos from 1 PeV to 3 EeV with the MAGIC telescopes
A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l [...]
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2018-06-18
14:39
OpenAccess [PUBDB-2018-02318] Journal Article
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Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic
Optics express 26(13), 16955 - 16968 () [10.1364/OE.26.016955]  GO
We systematically study the efficiency enhancement of high-harmonic generation (HHG) in an Ar gas cell up to the soft X-ray (SXR) range using a two-color laser field composed of 2.1 μm (ω) and 700 nm (3ω) with parallel linear polarization. Our experiment follows the recent theoretical investigations that determined two-color mid-infrared (IR) pulses, mixed with their third harmonic (ω + 3ω), to be close to optimal driving waveforms for enhancing HHG efficiency in the SXR region [Jin et al., Nature Comm. [...]
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2018-06-18
07:27
OpenAccess [PUBDB-2018-02315] Journal Article
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Evidence for a pressure-induced spin transition in olivine-type $\mathrm{LiFePO_{4}}$ triphylite
We present a combination of first-principles and experimental results regarding the structural and magnetic properties of olivine-type $\mathrm{LiFePO_{4}}$ under pressure. Our investigations indicate that the starting $Pbnm$ phase of $\mathrm{LiFePO_{4}}$ persists up to 70 GPa [...]
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2018-06-17
09:25
[PUBDB-2018-02309] Journal Article
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High-pressure synthesis of a nitrogen-rich inclusion compound ReN8·xN2 with conjugated polymeric nitrogen chains
Abstract: A nitrogen-rich compound, ReN8·xN2, was synthesizedby a direct reaction between rhenium and nitrogen at highpressure and high temperature in a laser-heated diamond anvilcell. Single-crystal X-ray diffraction revealed that the crystalstructure, which is based on the ReN8 framework, hasrectangular-shaped channels that accommodate nitrogen molecules.Thus, despite a very high synthesis pressure, exceeding100 GPa, ReN8·xN2 is an inclusion compound. [...]
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2018-06-14
11:07
[PUBDB-2018-02269] Journal Article
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Prospects of Using High-Intensity THz Pulses To Induce Ultrafast Temperature-Jumps in Liquid Water
Ultrashort, high-intensity terahertz (THz) pulses, e.g., generated at free-electron laser facilities, allow for direct investigation as well as the driving of intermolecular modes in liquids like water and thus will deepen our understanding of the hydrogen bonding network. In this work, the temperature-jump (T-jump) of water induced by THz radiation is simulated for ten different THz frequencies in the range from 3 to 30 THz and five different pulse intensities in the range from 1 × 10$^{11}$ to 5 × 10$^{12}$ W/cm$^{2}$ employing both ab initio molecular dynamics (AIMD) and force field molecular dynamics (FFMD) approaches [...]
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2018-06-13
16:10
[PUBDB-2018-02266] Journal Article
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Energy scalable, offset-free ultrafast mid-infrared source harnessing self-phase-modulation-enabled spectral selection
Optics letters 43(12), 2953 - 2956 () [10.1364/OL.43.002953]  GO
We demonstrate a high-power offset-free ultrafast mid-infrared (IR) laser source based on difference-frequency generation (DFG). Powerful signal pulses are obtained by filtering the rightmost spectral lobe of the optical spectra broadened by fiber-optic nonlinearities dominated by self-phase modulation. [...]
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2018-06-13
14:58
OpenAccess [PUBDB-2018-02265] Report/Journal Article
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The light bound states of $\mathcal{N}=1$ supersymmetric SU(3) Yang-Mills theory on the latticeThep
[DESY-18-008; MS-TP-18-04; arXiv:1801.08062]
In this article we summarise our results from numerical simulations of $\mathcal{N}=1$ supersymmetric Yang-Mills theory with gauge group SU(3). We use the formulation of Curci and Veneziano with clover-improved Wilson fermions. [...]
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