Annalen der Physik

Cover image for Vol. 18 Issue 12

December 2009

Volume 18, Issue 12

Pages 815–966

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Preface
    5. Invited Papers
    6. Contributed Papers
    1. Cover Picture: Ann. Phys. 12/2009

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200990012

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Preface
    5. Invited Papers
    6. Contributed Papers
    1. Contents: Ann. Phys. 12/2009 (pages 815–820)

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200918012

  3. Preface

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Preface
    5. Invited Papers
    6. Contributed Papers
    1. Preface Ann. Phys. 12 / 2009 (page 821)

      Imre Varga

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200990013

  4. Invited Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Preface
    5. Invited Papers
    6. Contributed Papers
    1. Network modules help the identification of key transport routes, signaling pathways in cellular and other networks (pages 822–829)

      R. Palotai and P. Csermely

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910378

      Thumbnail image of graphical abstract

      Complex systems are successfully reduced to interacting elements via the network concept. Transport plays a key role in the survival of networks – for example the specialized signaling cascades of cellular networks filter noise and efficiently adapt the network structure to new stimuli. However, the authors' general understanding of transport mechanisms and signaling pathways in complex systems is yet limited. Here they summarize the key network structures involved in transport, list the solutions available to overloaded systems for relaxing their load and outline a possible method for the computational determination of signaling pathways. They highlight that in addition to hubs, bridges and the network skeleton, the overlapping modular structure is also essential in network transport. Path-lenghts in the module-space of the yeast protein-protein interaction network indicated that module-based paths may cross fewer modular boundaries than shortest paths. Moreover, by locating network elements in the space of overlapping network modules and evaluating their distance in this ‘module space’, it may be possible to approximate signaling pathways computationally, which, in turn could serve the identification of signaling pathways of complex systems.

    2. Ageing in granular aluminium insulating thin films (pages 830–835)

      J. Delahaye and T. Grenet

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910379

      Thumbnail image of graphical abstract

      The authors present a new set of electrical field effect measurements on granular aluminium insulating thin films. They have explored how the conductance relaxations induced by gate voltage changes depend on the age of the system, namely the time elapsed since its quench at low temperature. A clear age dependence of the relaxations is seen, qualitatively similar to ageing effects seen in other well studied glassy systems such as spin glasses or polymers. The authors explain how their results differ from the previous ones obtained with different protocols in indium oxide and granular aluminium thin films. Their experimental findings bring new information on the dynamics of the system and put new constraints on the theoretical models that may explain slow conductance relaxations in disordered insulators.

    3. 1/f noise and slow relaxations in glasses (pages 836–843)

      A. Amir, Y. Oreg and Y. Imry

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910392

      Thumbnail image of graphical abstract

      Recently the authors have shown that slow relaxations in the electron glass system can be understood in terms of the spectrum of a matrix describing the relaxation of the system close to a metastable state. The model focused on the electron glass system, but its generality was demonstrated on various other examples. Here, the noise spectrum in the same framework is studied. A remarkable relation is obtained between the spectrum of relaxation rates λ described by the distribution function P(λ) ∼ 1/λ and the 1/f noise in the fluctuating occupancies of the localized electronic sites. This noise can be observed using local capacitance measurements. The authors confirm their analytic results using numerics, and also show how the Onsager symmetry is fulfilled in the system.

    4. Anderson localization of matter waves (pages 844–848)

      P. Bouyer

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910391

      Thumbnail image of graphical abstract

      The transport of quantum particles in non ideal material media is strongly affected by scattering from impurities of the medium. Even for a weak disorder, semi-classical theories, such as those based on the Boltzmann equation for matter-waves scattering from the impurities, often fail to describe transport properties and full quantum approaches are necessary. The properties of the quantum systems are of fundamental interest as they show intriguing and non-intuitive phenomena that are not yet fully understood. Understanding quantum transport in amorphous solids is one of the main issues in this context, related to electric and thermal conductivities.

    5. Purely electronic transport and localization in the Bose glass (pages 849–855)

      M. Müller

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910393

      Thumbnail image of graphical abstract

      The author discusses transport and localization properties on the insulating side of the disorder dominated superconductor-insulator transition, described in terms of the dirty boson model. Analyzing the spectral properties of the interacting bosons in the absence of phonons, he argues that the Bose glass phase admits three distinct regimes. For strongest disorder the boson system is a fully localized, perfect insulator at any temperature. At smaller disorder, only the low temperature phase exhibits perfect insulation while delocalization takes place above a finite temperature. He argues that a third phase must intervene between these perfect insulators and the superconductor. This conducting Bose glass phase is characterized by a mobility edge in the many body spectrum, located at finite energy above the ground state. In this insulating regime purely electronically activated transport occurs, with a conductivity following an Arrhenius law at asymptotically low temperatures, while a tendency to superactivation is predicted at higher T. These predictions are in good agreement with recent transport experiments in highly disordered films of superconducting materials.

    6. Effect of electric field on diffusion in disordered materials (pages 856–862)

      F. Jansson, A.V. Nenashev, S.D. Baranovskii, F. Gebhard and R. Österbacka

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910405

      Thumbnail image of graphical abstract

      The effect of electric field on diffusion of charge carriers in disordered materials is studied by Monte Carlo computer simulations and analytical calculations. It is shown how an electric field enhances the diffusion coefficient in the hopping transport mode. The enhancement essentially depends on the temperature and on the energy scale of the disorder potential. It is shown that in one-dimensional hopping the diffusion coefficient depends linearly on the electric field, while for hopping in three dimensions the dependence is quadratic.

  5. Contributed Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Preface
    5. Invited Papers
    6. Contributed Papers
    1. Non-linear conductivity in Coulomb glasses (pages 873–876)

      M. Caravaca, A. Voje, J. Bergli, M. Ortuño and A.M. Somoza

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910377

    2. Study of two-electron jumps in relaxation of Coulomb glasses (pages 877–881)

      J. Bergli, A.M. Somoza and M. Ortuño

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910376

    3. Light transport and correlation length in a random laser (pages 882–886)

      R. Frank, A. Lubatsch and J. Kroha

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910387

    4. Broken time-reversal symmetry scattering at the Anderson transition (pages 896–900)

      A. Alcazar, A. Méndez and I. Varga

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910375

    5. Scaling law and critical exponent for α0 at the 3D Anderson transition (pages 901–904)

      L.J. Vasquez, K. Slevin, A. Rodriguez and R.A. Roemer

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910397

    6. Localization of excitons in weakly disordered semiconductor structures: A model study (pages 905–909)

      N. Gögh, P. Thomas, I. Kuznetsova, T. Meier and I. Varga

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910382

    7. Conductance asymmetry of a slot gate Si-MOSFET in a strong parallel magnetic field (pages 913–917)

      I. Shlimak, D.I. Golosov, A. Butenko, K.-J. Friedland and S.V. Kravchenko

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910400

    8. Spin-dependent-magnetoresistance control by regulation of heat treatment temperature for magnetite nano-particle sinter (pages 935–938)

      H. Kobori, T. Asahi, Y. Yamasaki, A. Sugimura, T. Taniguchi, A. Ando, H. Kawanaka, Y. Naitoh and T. Shimizu

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910385

    9. Magnetoresistance in dilute p-Si/SiGe in parallel and tilted magnetic fields (pages 939–943)

      I.L. Drichko, I.Yu. Smirnov, A.V. Suslov, O.A. Mironov and D.R. Leadley

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910380

    10. Localised magneto-optical collective excitations of impure graphene (pages 944–948)

      A.M. Fischer, A.B. Dzyubenko and R.A. Römer

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910381

    11. The dependence of polymer conductivity on the work function of metallic electrodes (pages 959–962)

      A.N. Ionov, M.S. Dunaevskii, M.N. Nikolaeva and R. Rentzsch

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910384

    12. Superconductivity of polymers with charge injection doping (pages 963–966)

      A.N. Ionov and R. Rentzsch

      Version of Record online: 20 JAN 2010 | DOI: 10.1002/andp.200910383

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