Annalen der Physik

Cover image for Annalen der Physik

August 2008

Volume 17, Issue 8

Pages 521–611

  1. Contents

    1. Top of page
    2. Contents
    3. Recent and forthcoming publication in Annalen der Physik
    4. Original Papers
    5. Original Paper
    1. Contents: Ann. Phys. 8/2008 (pages 521–522)

      Article first published online: 24 OCT 2008 | DOI: 10.1002/andp.200817011

  2. Recent and forthcoming publication in Annalen der Physik

    1. Top of page
    2. Contents
    3. Recent and forthcoming publication in Annalen der Physik
    4. Original Papers
    5. Original Paper
    1. Ann. Phys. 9-10/2008: Special Issue: The Minkowski spacetime of special relativity theory - 100 years after its discovery (page 523)

      Article first published online: 24 OCT 2008 | DOI: 10.1002/andp.200817012

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      On 21 September 2008 is the centennial for Hermann Minkowski's famous popular lecture in Cologne on “Space and Time”. Therein he demonstrated that the spacetime of Einstein's special relativity theory can be described by means of a four-dimensional (pseudo-)Euclidean geometry. The September/October 2008 issue of the Annalen is dedicated to the memory of Minkowski. Historical papers (Damour, Kastrup), papers extending special relativity (Mashhoon, Cacciatori-Gorini-Kamenshchik), papers on electrodynamics in Minkowski space (Itin-Friedman, Obukhov, Sihvola-Lindell), and an essay on the Weinberg-Witten theorem (Loebbert) convey ideas of the modern developments initiated by Minkowski's speech.

  3. Original Papers

    1. Top of page
    2. Contents
    3. Recent and forthcoming publication in Annalen der Physik
    4. Original Papers
    5. Original Paper
    1. Electronic structure calculations for inhomogeneous systems: Interfaces, surfaces, and nanocontacts (pages 525–560)

      U. Schwingenschlögl and C. Schuster

      Article first published online: 6 JUN 2008 | DOI: 10.1002/andp.200810310

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      The article gives an introduction into the application of density functional theory (DFT) to inhomogeneous systems. To begin with, we describe the interplay of specific materials at interfaces, resulting in structure relaxation and modifications of the chemical bonding. We address interfaces between YBa2Cu3O7 and a normal metal, in order to quantify the intrinsic interface charge transfer into the superconductor. Moreover, we study the internal interfaces in a V6O13 battery cathode and the effects of ion incorporation during the charging and discharging process. The second part of the article deals with the influence of surfaces on the nearby electronic states. Here, we investigate a LaAlO3/SrTiO3 heterostructure in a thin film geometry. We particularly explain the experimental dependence of the electronic states at the heterointerface on the surface layer thickness. Afterwards, surface relaxations are studied for both the clean Ge(001) surface and for self-assembled Pt nanowires on Ge(001). In the third part, we turn to atomic and molecular contacts. We compare the properties of prototypical Al nanocontact geometries, aiming at insight into the chemical bonding and the occupation of the atomic orbitals. Finally, the local electronic structure of a benzene-1,4-dithiol molecule between two Au electrodes is discussed as an example for a molecular bridge.

    2. Interacting bosons in an optical lattice (pages 561–608)

      C. Moseley, O. Fialko and K. Ziegler

      Article first published online: 10 JUL 2008 | DOI: 10.1002/andp.200710311

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      A strongly interacting Bose gas in an optical lattice is studied using a hard-core interaction. Two different approaches are introduced, one is based on a spin-1/2 Fermi gas with attractive interaction, the other one on a functional integral with an additional constraint (slave-boson approach). The relation between fermions and hard-core bosons is briefly discussed for the case of a one-dimensional Bose gas. For a three-dimensional gas we identify the order parameter of the Bose-Einstein condensate through a Hubbard-Stratonovich transformation and treat the corresponding theories within a mean-field approximation and with Gaussian fluctuations. The role of quantum and thermal fluctuations are studied in detail for both approaches, where we find good agreement with the Gross-Pitaevskii equation and with the Bogoliubov approach in the dilute regime. In the dense regime, which is characterized by the phase transition between the Bose-Einstein condensate and the Mott insulator, we discuss a renormalized Gross-Pitaevskii equation. Finally, we compare the results of the attractive spin-1/2 Fermi gas and those of the slave-boson approach and find good agreement for all physical quantities.

  4. Original Paper

    1. Top of page
    2. Contents
    3. Recent and forthcoming publication in Annalen der Physik
    4. Original Papers
    5. Original Paper

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