Coulomb gap in a model with finite charge transfer energy

The Coulomb gap in a donor-acceptor model with finite charge transfer energy $\Delta$ describing the electronic system on the dielectric side of the metal-insulator transition is investigated by means of computer simulations on two- and three-dimensional finite samples with a random distribution of equal amounts of donor and acceptor sites. Rigorous relations reflecting the symmetry of the model presented with respect to the exchange of donors and acceptors are derived. In the immediate neighborhood of the Fermi energy $\mu$ the the density of one-electron excitations $g(\epsilon)$ is determined solely by finite size effects and $g(\epsilon)$ further away from $\mu$ is described by an asymmetric power law with a non-universal exponent, depending on the parameter $\Delta$.Comment: 10 pages, 6 figures, submitted to Phys. Rev.

The λ-point, entropy and density of rotating He2

The λ-point, entropy and density of HeII have been found to be independent of rotation up to ω = 110 sec-1 to within ΔTλ = 10-50 °K, ΔS = 7 × 10-4 joule/mole °K, and Δvarrho/varrho = 2 × 10-6 respectively

Automatic annotation of confidential data in java code

The problem of confidential information leak can be addressed by using automatic tools that take a set of annotated inputs (the source) and track their flow to public sinks. Unfortunately, manually annotating the code with labels specifying the secret sources is one of the main obstacles in the adoption of such trackers. In this work, we present an approach for the automatic generation of labels for confidential data in Java programs. Our solution is based on a graph-based representation of Java methods: starting from a minimal set of known API calls, it propagates the labels both intra- and inter-procedurally until a fix-point is reached. In our evaluation, we encode our synthesis and propagation algorithm in Datalog and assess the accuracy of our technique on seven previously annotated internal code bases, where we can reconstruct 75% of the pre-existing manual annotations. In addition to this single data point, we also perform an assessment using samples from the SecuriBench-micro benchmark, and we provide additional sample programs that demonstrate the capabilities and the limitations of our approach

Energy relaxation of hot electrons and inelastic collision time in thin metal films at low temperatures

In a sandwich consisting of a thin Au film and a thin Bi film insulated by a 500 Å SiO layer the electrons of one film are heated above the lattice temperature while in the other film they are kept in thermal equilibrium temperature while in the other film they are kept in thermal equilibrium with the phonons. By measuring the magnetoresistance of both films we obtain the temperature difference between electrons and phonons from which we imply the energy-relaxation time τε from 0.3 K to 2 K. We find that electron-phonon scattering determines τε and, above 5 K, also the inelastic collision time τi obtained from weak localization theory in thermal equilibrium

Inhibition of tunneling from electronic bubble states in liquid helium into the vapor phase at high vapor densities

It is shown that at temperatures near 4.2 K electron tunneling from liquid helium into the vapor phase will be inhibited due to the increasing vapor density

Note on the vortex density in rotating helium II

Computer calculations show that there exist no large stable deviations from the homogeneous vortex density in an annulus or cylinder; the solutions of Masson and Tien are unstable

Altlasteninformationssystem GISA fuer den Raum Halle/Saale. T. 2 Abschlussbericht

SIGLEAvailable from TIB Hannover: F98B989 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman