@article{MorHerzogGolezetal.2017,
  author    = {Mor, Selene and Herzog, Marc and Golez, Denis and Werner, Philipp and Eckstein, Martin and Katayama, Naoyuki and Nohara, Minoru and Takagi, Hide and Mizokawa, Takashi and Monney, Claude and Staehler, Julia},
  title     = {Ultrafast Electronic Band Gap Control in an Excitonic Insulator},
  series = {Physical review letters},
  volume    = {119},
  journal   = {Physical review letters},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {0031-9007},
  doi       = {10.1103/PhysRevLett.119.086401},
  pages     = {11559 -- 11567},
  year      = {2017},
  abstract  = {We report on the nonequilibrium dynamics of the electronic structure of the layered semiconductor Ta2NiSe5 investigated by time-and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of F-C = 0.2 mJ cm(-2), the band gap narrows transiently, while it is enhanced above FC. Hartree-Fock calculations reveal that this effect can be explained by the presence of the low-temperature excitonic insulator phase of Ta2NiSe5, whose order parameter is connected to the gap size. This work demonstrates the ability to manipulate the band gap of Ta2NiSe5 with light on the femtosecond time scale.},
  language  = {en}
}
@article{RauchQuinetHoyeretal.2016,
  author    = {Rauch, Thomas and Quinet, P. and Hoyer, D. and Werner, K. and Richter, Philipp and Kruk, J. W. and Demleitner, M.},
  title     = {VII. New Kr IV - VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503-289},
  series = {Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants},
  volume    = {590},
  journal   = {Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants},
  publisher = {EDP Sciences},
  address   = {Les Ulis},
  organization    = {VERITAS Collaboration},
  issn      = {1432-0746},
  doi       = {10.1051/0004-6361/201628131},
  pages     = {26},
  year      = {2016},
  abstract  = {Context. For the spectral analysis of high-resolution and high signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation. Aims. New Kr IV-VII oscillator strengths for a large number of lines enable us to construct more detailed model atoms for our NLTE model-atmosphere calculations. This enables us to search for additional Kr lines in observed spectra and to improve Kr abundance determinations. Methods. We calculated Kr IV-VII oscillator strengths to consider radiative and collisional bound-bound transitions in detail in our NLTE stellar-atmosphere models for the analysis of Kr lines that are exhibited in high-resolution and high S/N ultraviolet (UV) observations of the hot white dwarf RE 0503-289. Results. We reanalyzed the effective temperature and surface gravity and determined T-eff = 70 000 +/- 2000 K and log (g/cm s(-2)) = 7.5 +/- 0.1. We newly identified ten Kr V lines and one Kr vi line in the spectrum of RE 0503-289. We measured a Kr abundance of 3.3 +/- 0.3 (logarithmic mass fraction). We discovered that the interstellar absorption toward RE 0503-289 has a multi-velocity structure within a radial-velocity interval of -40 km s(-1) < upsilon(rad) < +18 km s(-1). Conclusions. Reliable measurements and calculations of atomic data are a prerequisite for state-of-the-art NLTE stellar-atmosphere modeling. Observed Kr V-VII line profiles in the UV spectrum of the white dwarf RE 0503-289 were simultaneously well reproduced with our newly calculated oscillator strengths.},
  language  = {en}
}
@article{RichterdeBoerWerneretal.2015,
  author    = {Richter, Philipp and de Boer, Klaas S. and Werner, Klaus and Rauch, Thomas},
  title     = {High-velocity gas toward the LMC resides in the Milky Way halo},
  series = {Astronomy and astrophysics : an international weekly journal},
  volume    = {584},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  publisher = {EDP Sciences},
  address   = {Les Ulis},
  issn      = {1432-0746},
  doi       = {10.1051/0004-6361/201527451},
  pages     = {4},
  year      = {2015},
  abstract  = {Aims. To explore the origin of high-velocity gas in the direction of the Large Magellanic Cloud, (LMC) we analyze absorption lines in the ultraviolet spectrum of a Galactic halo star that is located in front of the LMC at d = 9.2(-7.2)(+4.1) kpc distance. Methods. We study the velocity-component structure of low and intermediate metal ions (CII, SiII, SiIII) in the spectrum of RXJ0439.8-6809, as obtained with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope (HST), and measure equivalent widths and column densities for these ions. We supplement our COS data with a Far-Ultraviolet Spectroscopic Explorer (FUSE) spectrum of the nearby LMC star Sk-69 59 and with Hi 21 cm data from the Leiden-Argentina-Bonn (LAB) survey. Results. Metal absorption toward RXJ0439.8-6809 is unambiguously detected in three different velocity components near v(LSR) = 0, + 60, and + 150 km s(-1). The presence of absorption proves that all three gas components are situated in front of the star, thus located in the disk and inner halo of the Milky Way. For the high-velocity cloud (HVC) at v(LSR) = + 150 km s(-1), we derive an oxygen abundance of [O/H] = -0.63 (similar to 0.2 solar) from the neighboring Sk-69 59 sight line, in accordance with previous abundance measurements for this HVC. From the observed kinematics we infer that the HVC hardly participates in the Galactic rotation. Conclusions. Our study shows that the HVC toward the LMC represents a Milky Way halo cloud that traces low column density gas with relatively low metallicity. We rule out scenarios in which the HVC represents material close to the LMC that stems from a LMC outflow.},
  language  = {en}
}
@article{DautzenbergJaegerKoetzetal.1994,
  author    = {Dautzenberg, Herbert and Jaeger, Werner and Koetz, Joachim and Philipp, B. and Seidel, Ch. and Stscherbina, D.},
  title     = {Polyelectrolytes : formation, characterization and application},
  publisher = {Hanser},
  address   = {M{\"u}nchen [u.a.]},
  pages     = {XIV, 343 S.},
  year      = {1994},
  language  = {en}
}
@book{OttoPollakWerneretal.2015,
  author    = {Otto, Philipp and Pollak, Jaqueline and Werner, Daniel and Wolff, Felix and Steinert, Bastian and Thamsen, Lauritz and Taeumel, Marcel and Lincke, Jens and Krahn, Robert and Ingalls, Daniel H. H. and Hirschfeld, Robert},
  title     = {Exploratives Erstellen von interaktiven Inhalten in einer dynamischen Umgebung​},
  number    = {101},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-346-6},
  issn      = {1613-5652},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-83806},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {vii, 115},
  year      = {2015},
  abstract  = {Bei der Erstellung von Visualisierungen gibt es im Wesentlichen zwei Ans{\"a}tze. Zum einen k{\"o}nnen mit geringem Aufwand schnell Standarddiagramme erstellt werden. Zum anderen gibt es die M{\"o}glichkeit, individuelle und interaktive Visualisierungen zu programmieren. Dies ist jedoch mit einem deutlich h{\"o}heren Aufwand verbunden. Flower erm{\"o}glicht eine schnelle Erstellung individueller und interaktiver Visualisierungen, indem es den Entwicklungssprozess stark vereinfacht und die Nutzer bei den einzelnen Aktivit{\"a}ten wie dem Import und der Aufbereitung von Daten, deren Abbildung auf visuelle Elemente sowie der Integration von Interaktivit{\"a}t direkt unterst{\"u}tzt.},
  language  = {de}
}
@misc{MaierWolfKeiligetal.2018,
  author    = {Maier, Philipp and Wolf, J{\"u}rgen and Keilig, Thomas and Krabbe, Alfred and Duffard, Rene and Ortiz, Jose-Luis and Klinkner, Sabine and Lengowski, Michael and M{\"u}ller, Thomas and Lockowandt, Christian and Krockstedt, Christian and Kappelmann, Norbert and Stelzer, Beate and Werner, Klaus and Geier, Stephan and Kalkuhl, Christoph and Rauch, Thomas and Schanz, Thomas and Barnstedt, J{\"u}rgen and Conti, Lauro and Hanke, Lars},
  title     = {Towards a European Stratospheric Balloon Observatory},
  series = {Ground-based and Airborne Telescopes VII},
  volume    = {10700},
  journal   = {Ground-based and Airborne Telescopes VII},
  publisher = {SPIE-INT Soc Optical Engineering},
  address   = {Bellingham},
  isbn      = {978-1-5106-1954-8},
  issn      = {0277-786X},
  doi       = {10.1117/12.2319248},
  pages     = {12},
  year      = {2018},
  abstract  = {This paper presents the concept of a community-accessible stratospheric balloon-based observatory that is currently under preparation by a consortium of European research institutes and industry. We present the technical motivation, science case, instrumentation, and a two-stage image stabilization approach of the 0.5-m UV/visible platform. In addition, we briefly describe the novel mid-sized stabilized balloon gondola under design to carry telescopes in the 0.5 to 0.6 m range as well as the currently considered flight option for this platform. Secondly, we outline the scientific and technical motivation for a large balloon-based FIR telescope and the ESBO DS approach towards such an infrastructure.},
  language  = {en}
}