Mechanical and electrical control of charge transport through nanostructures


We study the influence of vibrational modes on the charge current and its fluctuations in atomic and molecular junctions with material-specific ab-initio techniques. Existing theoretical models are extended to include the coupling of the vibrations in the central scattering region to the surrounding electrodes to obtain a realistic description of current-induced heating. Applied to nonmagnetic systems in the first part, the techniques are generalized in the second part to treat noncollinearly magnetic nanostructures. We study the scattering between different transmission and spin channels due to vibrations and naturally take into account multiple electronic levels and vibrational modes. The externally adjustable distance between the electrodes controls precisely electronic couplings and vibrational properties, while magnetic fields provide additional external means for manipulating junctions that contain magnetic atoms or molecules.

  • Department of Physics
  • WG Pauly (Theoretische Physik mit SP Molekulare Elektronik)
  Weber, David (2018): Current-Induced Switching in Superconducting Break Junctions
    Guo, Yuning; Dekorsy, Thomas; Hettich, Mike (2017): Topological guiding of elastic waves in phononic metamaterials based on 2D pentamode structures Scientific Reports. 2017, 7(1), 18043. eISSN 2045-2322. Available under: doi: 10.1038/s41598-017-18394-8

Topological guiding of elastic waves in phononic metamaterials based on 2D pentamode structures


A topological state with protected propagation of elastic waves is achieved by appropriately engineering a phononic metamaterial based on 2D pentamode structures in silicon. Gapless edge states in the designed structure, which are characterized by pseudospin-dependent transport, provide backscattering-immune propagation of the elastic wave along bend paths. The role of the states responsible for forward and backward transfer can be interchanged by design.

Origin (projects)

Funding sources
Name Finanzierungstyp Kategorie Project no.
SFB third-party funds research funding program 773/13
Further information
Period: 01.10.2013 – 31.12.2019