Publications (18)
A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations
J. L. Ortiz, N. Morales, B. Sicardy +98
Trans-Neptunian objects (TNOs) are among the most ancient bodies of the solar system. Understanding their physical properties is key to constraining their origin and the evolution…
Coulomb blockade in two island systems with highly conductive junctions
B. Limbach, P. vom Stein, C. Wallisser +1
We report measurements on single-electron pumps, consisting of two metallic islands formed by three tunnel junctions in series. We focus on the linear-response conductance as a fun…
Gamma Ray Large Area Space Telescope (GLAST) Balloon Flight Data Handling Overview
T. H. Burnett, A. Chekhtman, E. do Couto e Silva +22
The GLAST Balloon Flight Engineering Model (BFEM) represents one of 16 towers that constitute the Large Area Telescope (LAT), a high-energy (>20 MeV) gamma-ray pair-production tele…
Large Scale Structure and Supersymmetric Inflation without Fine Tuning
G. Dvali, Q. Shafi, R. Schaefer
We explore constraints on the spectral index of density fluctuations and the neutrino energy density fraction , employing data from a variety of large scale observati…
Fidelity recovery in chaotic systems and the Debye-Waller factor
H. -J. Stoeckmann, R. Schaefer
Using supersymmetry calculations and random matrix simulations, we studied the decay of the average of the fidelity amplitude f_epsilon(tau)=<psi(0)| exp(2 pi i H_epsilon tau) exp(…
Transition from Gaussian-orthogonal to Gaussian-unitary ensemble in a microwave billiard with threefold symmetry
R. Schaefer, M. Barth, F. Leyvraz +3
Recently it has been shown that time-reversal invariant systems with discrete symmetries may display in certain irreducible subspaces spectral statistics corresponding to the Gauss…
Correlation functions of scattering matrix elements in microwave cavities with strong absorption
R. Schaefer, T. Gorin, T. H. Seligman +1
The scattering matrix was measured for microwave cavities with two antennas. It was analyzed in the regime of overlapping resonances. The theoretical description in terms of a stat…
Kerr microscopy study of magnetic domains and their dynamics in bulk Ni-Mn-Ga austenite
A. Perevertov, I. Soldatov, R. Schaefer +2
The observation of magnetic domains on austenite Ni-Mn-Ga bulk samples has been a big challenge for many years. Using advanced Kerr microscopy, with automatic compensation of the s…
Experimental verification of fidelity decay: From perturbative to Fermi Golden Rule regime
R. Schaefer, T. Gorin, T. H. Seligman +1
The scattering matrix was measured for a flat microwave cavity with classically chaotic dynamics. The system can be perturbed by small changes of the geometry. We define the "scatt…
Broadening of the transition between charge states in the single-electron box by the measurement process
R. Schaefer, B. Limbach, P. v. Stein +1
We report on measurements on a sample consisting of two nominally identical single-electron transistors the islands of which are coupled capacitively. One transistor at a time is o…
A new sound mode in liquid Helium 4?
R. Schaefer, T. Fliessbach
This letter is based on the hypothesis of a small entropy content of the superfluid fraction of liquid helium. We show that such a superfluid entropy gives rise to a new sound mode…
The Filter Imager SuFI and the Image Stabilization and Light Distribution System ISLiD of the Sunrise Balloon-Borne Observatory: Instrument Description
A. Gandorfer, B. Grauf, P. Barthol +29
We describe the design of the Sunrise Filter Imager (SuFI) and the Image Stabilization and Light Distribution (ISLiD) unit onboard the Sunrise balloon borne solar observatory. This…
On the Numerical Solution of the Time-Dependent Schroedinger Equation
R. Schaefer, R. Blendowske
An algorithm for the numerical solution of the Schrödinger equation in the case of a time dependent potential is proposed. Our simple modification upgrades the well known method o…
Fidelity amplitude of the scattering matrix in microwave cavities
R. Schaefer, T. Gorin, T. H. Seligman +1
The concept of fidelity decay is discussed from the point of view of the scattering matrix, and the scattering fidelity is introduced as the parametric cross-correlation of a given…
Millimetric Ground Based Observation of CMBR Anisotropy at $δ=+28^{\lowercase{o}}$
G. Romeo, S. Ali, B. Femenia +4
Results from the third campaign of a ground-based multi-band observation of the millimeter emission of the sky from Tenerife (Canary Islands) are presented. The instrument consists…
Conductance of the single-electron transistor: A comparison of experimental data with Monte Carlo calculations
C. Wallisser, B. Limbach, P. vom Stein +4
We report on experimental results for the conductance of metallic single-electron transistors as a function of temperature, gate voltage and dimensionless conductance. In contrast…
Recovery of the fidelity amplitude for the Gaussian ensembles
H. -J. Stoeckmann, R. Schaefer
Using supersymmetry techniques analytical expressions for the average of the fidelity amplitude f_epsilon(tau)=< psi(0)| exp(2 pi i H_epsilon tau) exp(-2 pi i H_0 tau)| psi(0) > ar…
The two-fluid model with superfluid entropy
R. Schaefer, T. Fliessbach
The two-fluid model of liquid helium is generalized to the case that the superfluid fraction has a small entropy content. We present theoretical arguments in favour of such a small…