Fakultät für Mathematik und Physik

 

Neueste Zugänge

  • Horiuchi, S.; Shirakawa, T.; Ohta, Y. (Bristol : IOP Publishing Ltd., 2009)
    Electronic states of hollandite vanadate K2V8O 16, a one-dimensional zigzag-chain system of t2g orbitals in a mixed valent state, are considered. We calculate the Madelung energies to determine the most stable charge-ordering ...
  • Lechtenfeld, O. (Bristol : IOP Publishing Ltd., 2008)
    I consider a supersymmetric Bogomolny-type model in 2+1 dimensions originating from topological string theory. By a gauge fixing this model is reduced to a supersymmetric U(n) chiral model with a Wess-Zumino-Witten-type ...
  • Seki, K.; Shirakawa, T.; Ohta, Y. (Bristol : IOP Publishing Ltd., 2009)
    Using an exact-diagonalization technique on small clusters, we calculate the spin and density excitation spectra as well as the temperature dependence of the specific heat for the triangular-lattice t-J model with the ...
  • Friedrich, D.; Burmeister, O.; Britzger, M.; Bunkowski, A.; Clausnitzer, T.; Fahr, S.; Kley, E.-B.; Tünnermann, A.; Danzmann, K.; Schnabel, R. (Bristol : IOP Publishing Ltd., 2008)
    We designed and fabricated an all-reflective 50/50 beam splitter based on a dielectric grating. This beam splitter was used to set up a power-recycled Michelson interferometer with a finesse of about FPR ≈ 880. Aspects of ...
  • Esteban, J.J.; Bykov, I.; Marín, A.F.G.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2009)
    In order to implement optical inter-spacecraft ranging and data transfer for LISA, the carrier of the laser link must be phase modulated with pseudo-randon noise sidebands. The data acquisition and delay estimation are ...
  • Sämann, C. (New York, NY : Hindawi Publishing Corporation, 2009)
    We construct a new supertwistor space suited for establishing a Penrose-Ward transform between certain bundles over this space and solutions to the N = 8 super-Yang-Mills equations in three dimensions. This mini-superambitwistor ...
  • Fleddermann, R.; Steier, F.; Tröbs, M.; Bogenstahl, J.; Killow, C.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2009)
    Polarization maintaining single-mode optical fibers are key components in the interferometry of the Laser Interferometer Space Antenna (LISA). LISA's measurement principle relies on the availability of space qualified ...
  • Bykov, I.; Delgado, J.J.E.; Marín, A.F.G.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2009)
    We present the status of our investigations on the LISA Phasemeter. The new prototype is based on a custom-designed breadboard with four high-speed ADC and two DAC channels, extended readout capabilities and a large FPGA ...
  • Tröbs, M.; Barke, S.; Möbius, J.; Engelbrecht, M.; Kracht, D.; D'Arcio, L.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2009)
    We have investigated two alternative laser systems for the Laser Interferometer Space Antenna (LISA). One consisted of the laser of LISA's technology precursor LISA Pathfinder and a fiber amplifier originally designed for ...
  • Dehne, M.; Cervantes, F.G.; Sheard, B.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2009)
    The Gravity Recovery and Climate Experiment (GRACE) is one of the present missions to map the Earth's gravity field. The aim of a GRACE follow-on mission is to map the gravitational field of the Earth with higher resolution ...
  • García, Marín, A.F.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2007)
    The Laser Interferometer Space Antenna (LISA) is a joint ESA-NASA mission designed to observe gravitational waves in the frequency range between 10 -4 to 1 Hz, where ground-based detectors are limited by terrestrial noise. ...
  • Shirakawa, T.; Nishimoto, S.; Ohta, Y.; Fukuyama, H. (Bristol : IOP Publishing Ltd., 2009)
    Finite-size systems of the one-dimensional attractive Hubbard model with random potential are studied as an effective model for doped semiconductor nanotubes. We calculate the binding energy of Cooper pairs and pair ...
  • Dahl, K.; Bertolini, A.; Born, M.; Chen, Y.; Gering, D.; Goßler, S.; Gräf, C.; Heinzel, G.; Hild, S.; Kawazoe, F.; Kranz, O.; Kühn, G.; Lück, H.; Mossavi, K.; Schnabel, R.; Somiya, K.; Strain, K.A.; Taylor, J.R.; Wanner, A.; Westphal, T.; Willke, B.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2010)
    Currently, the AEI 10 m Prototype is being set up at the Albert Einstein Institute in Hannover, Germany. The Suspension Platform Interferometer (SPI) will be an additional interferometer set up inside the vacuum envelope ...
  • Lechtenfeld, O.; Maceda, M. (Kyiv : Institute of Mathematics of National Academy of Sciences of Ukraine, Department of Applied Research, 2010)
    We analyze the moduli-space metric in the static non-Abelian charge-two sector of the Moyal-deformed CP1 sigma model in 1 + 2 dimensions. After carefully reviewing the commutative results of Ward and Ruback, the noncommutative ...
  • Lück, H.; Affeldt, C.; Degallaix, J.; Freise, A.; Grote, H.; Hewitson, M.; Hild, S.; Leong, J.; Prijatelj, M.; Strain, K.A.; Willke, B.; Wittel, H.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2010)
    The German/ British gravitational wave detector GEO 600 is in the process of being upgraded. The upgrading process of GEO 600, called GEO-HF, will concentrate on the improvement of the sensitivity for high frequency signals ...
  • Esteban, J.J.; García, A.F.; Eichholz, J.; Peinado, A.M.; Bykov, I.; Heinzel, G.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2010)
    The LISA phase measurement system (PMS) will provide interferometric phase readout of the primary heterodyne signal at microcycle sensitivity, ranging measurements at sub-meter accuracy and data communication at rates of ...
  • Kwee, P.; Willke, B.; Danzmann, K. (Bristol : IOP Publishing Ltd., 2010)
    Three different laser power stabilization schemes are compared: a traditional power stabilization, a traditional one with subsequent optical resonator, and a power stabilization with the novel optical ac coupling technique. ...
  • Nakano, K.; Shirakawa, T.; Ohta, Y. (Bristol : IOP Publishing Ltd., 2010)
    The density-matrix renormalization group method is used to study the three-band zigzag ladder model that simulates the electronic state of the t 2g-orbital system of the double string of the edge-shared CrO 6 octahedra in ...
  • Ioannidou, T.; Lechtenfeld, O. (Amsterdam : Elsevier, 2009)
    We subject the baby Skyrme model to a Moyal deformation, for unitary or Grassmannian target spaces and without a potential term. In the Abelian case, the radial BPS configurations of the ordinary noncommutative sigma model ...
  • Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, R.J.; Pierz, K. (Bristol : IOP Publishing Ltd., 2010)
    We present non-resonant, polarization-resolved magneto-photoluminescence measurements up to 12 T on single InAs/AlAs quantum dots. We observe typical g-factors between 1 and 2, very low diamagnetic shifts due to strong ...

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