# OpenAccess

 2017-04-1021:18 [PUBDB-2017-01621] Book/Report/Dissertation / PhD Thesis et al Nuclear Resonance Scattering Study of Iridates, Iridium and Antimony Based Pyrochlores [DESY-THESIS-2017-013] DESY-THESIS 170 pp., (2017) [10.3204/PUBDB-2017-01621]   This thesis shows the first synchrotron-based Mössbauer spectroscopy studies on iridium containing compounds and first vibrational spectroscopy on Sb containing compounds carried out at the P01 beamline of PETRA III. In this context, two types of x-ray monochromators have been developed: a monochromator for 73 keV photons with medium energy resolution, and a high-resolution backscattering monochromator based on a sapphire crystal. [...] OpenAccess: desy-thesis-17-013.title - PDF; Diss_PDFA2b - PDF; 2017-04-1014:25 [PUBDB-2017-01598] Proceedings/Report et al Proceedings of the Helmholtz International Summer School 2016 (HQ 2016) [DESY-PROC-2016-04] Helmholtz International Summer School 2016, HQ 2016, Meeting locationDubna, Russia, 18 Jul 2016 - 30 Jul 2016Contributions / Info   The Helmholtz International Summer School (HISS) entitled “Quantum Field Theory at the Limits:from Strong Fields to Heavy Quarks (SF→ HQ)”, was held in the period July 18-30, 2016 at the Bogoliubov Laboratory of Theoretical Physics (BLTP) of the Joint Institute for Nuclear Research (JINR)in Dubna, Russia, as part of the activities of the Dubna International Advanced School of Theoretical Physics (DIAS-TH). The HISS series of schools has played an important role in bringing together an international faculty and young physicists (Ph.D. [...] OpenAccess: proc - PDF; cover - PNG; 2017-04-1010:07 [PUBDB-2017-01557] Report/Journal Article Westphal, A. Inflation with a Graceful Exit in a Random Landscape [DESY-16-224] Journal of high energy physics 2017(3), 163 (2017) [10.1007/JHEP03(2017)163]   We develop a stochastic description of small-field inationary histories witha graceful exit in a random potential whose Hessian is a Gaussian random matrix as amodel of the unstructured part of the string landscape. The dynamical evolution in sucha random potential from a small-field ination region towards a viable late-time de Sitter(dS) minimum maps to the dynamics of Dyson Brownian motion describing the relaxationof non-equilibrium eigenvalue spectra in random matrix theory. [...] OpenAccess: PDF; 2017-04-0708:43 [PUBDB-2017-01533] Journal Article et al Unraveling Local Spin Polarization of Zhang-Rice Singlet in Lightly Hole-Doped Cuprates Using High-Energy Optical Conductivity Physical review / B 95(16), 165108 (2017) [10.1103/PhysRevB.95.165108]   Unrevealing local magnetic and electronic correlations in the vicinity of charge carriers is crucial in order tounderstand rich physical properties in correlated electron systems. Here, using high-energy optical conductivity(up to 35 eV) as a function of temperature and polarization, we observe a surprisingly strong spin polarizationof the local spin singlet with enhanced ferromagnetic correlations between Cu spins near the doped holesin lightly hole-doped $La_{1.95}Sr_{0.05}Cu_{0.95}Zn_{0.05}O_4$. [...] OpenAccess: PDF; External link: Fulltext 2017-04-0615:33 [PUBDB-2017-01532] Book/Report/Dissertation / PhD Thesis Huse, N. Few-cycle High Energy Mid-Infrared Pulse from Ho:YLF Laser [DESY-THESIS-2017-012] DESY-THESIS 188 pp., (2017) [10.3204/PUBDB-2017-01532]   Over the past decade, development of high-energy ultrafast laser sources hasled to important breakthroughs in attoscience and strong-field physicsstudy of atoms and molecules. Coherent pulse synthesis of a few-cyclehigh-energy laser pulse is a promising tool to generate isolated attosecond pulsesvia high harmonics generation (HHG). [...] OpenAccess: desy-thesis-17-012.title - PDF; PhD Thesis - PDF; 2017-04-0608:33 [PUBDB-2017-01527] Journal Article et al Study on laser characteristics of Ho:YLF regenerative ampliers: Operation regimes, gain dynamics, and highly stable operation points Applied physics / B 123(4), 126 (2017) [10.1007/s00340-017-6704-0]   We present a comprehensive study of laser pulse amplification of Ho:YLF regenerative amplifiers (RAs) with respect to operation regimes, gain dynamics, and output pulse stability. The findings are expected to be more generic than for this specific gain material. [...] OpenAccess: PDF; 2017-04-0313:33 [PUBDB-2017-01522] Book/Report/Dissertation / PhD Thesis Stierle, A. Operando X-ray Investigation of Solid Oxide Fuel Cell Model Electrodes [DESY-THESIS-2017-011] DESY-THESIS 120 pp., (2017) [10.3204/PUBDB-2017-01522]   A detailed study of three solid oxide fuel cells (SOFCs) related model systems is presented in this work with the aim of the better understanding of the structural changes in cell components associated with their operation. The first model system is an La$_{0.6}$Sr$_{0.4}$CoO$_{3−δ}$ (LSC) on yttria-stabilized zirconia (YSZ). [...] OpenAccess: SVolkov_thesis - PDF; desy-thesis-17-011.title - PDF; 2017-04-0310:09 [PUBDB-2017-01521] Journal Article et al Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas Photonics 4(2), 25 (2017) [10.3390/photonics4020025]   The creation of high energy density plasma states produced during laser–solid interaction on a sub-picosecond timescale opens a way to create astrophysical plasmas in the lab to investigate their properties, such as the frequency-dependent refractive index. Available probes to measure absorption and phase-changes given by the complex refractive index of the plasma state are extreme-UV (EUV) and soft X-ray (XUV) ultra-short pulses from high harmonic generation (HHG). [...] OpenAccess: PDF; External link: Fulltext 2017-03-2915:50 [PUBDB-2017-01512] Report/Journal Article et al Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in $\sqrt{s}=$ 13 $pp$ collisions with the ATLAS detector [CERN-EP-2016-260; CERN-PH-2016-260; arXiv:1611.05791]   Two searches for new phenomena in final states containing a same-flavour opposite-sign lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton–proton collision data, collected during 2015 and 2016 at a centre-of-mass energy $\sqrt{s}=13$   $\text {TeV}$ by the ATLAS detector at the large hadron collider, which correspond to an integrated luminosity of $14.7~\mathrm {fb}^{-1}$ . [...] OpenAccess: PDF; 2017-03-2915:34 [PUBDB-2017-01511] Preprint/Report et al Measurements of electroweak $Wjj$ production and constraints on anomalous gauge couplings with the ATLAS detector [CERN-EP-2017-008; arXiv:1703.04362] Measurements of the electroweak production of a $W$ boson in association with two jets at high dijet invariant mass are performed using $\sqrt{s} = 7$ and $8$ TeV proton-proton collision data produced by the Large Hadron Collider, corresponding respectively to 4.7 and 20.2 fb$^{-1}$ of integrated luminosity collected by the ATLAS detector. The measurements are sensitive to the production of a $W$ boson via a triple-gauge-boson vertex and include both the fiducial and differential cross sections of the electroweak process.. OpenAccess: PDF;