Berlin 2024 – wissenschaftliches Programm
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 9: Theoretical Aspects of Condensed Matter II
MP 9.7: Vortrag
Mittwoch, 20. März 2024, 11:50–12:10, HL 102
Charge-Transport Mechanisms in the Conductive Fiber Network of Cable Bacteria — •Stefani Valianti1, Jasper van der Veen1, Filip Meysman2, Herre van der Zant1, and Yaroslav Blanter1 — 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands — 2Centre of Excellence for Microbial Systems Technology, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium.
Charge transfer is fundamental to life, and organisms have developed various conductive structures to support vital processes.The distance of biological charge transport has long been thought to be limited to nm scale, yet recent studies suggest that electric currents can run along cm-long wires.The most studied bacterial species that produce conductive structure are those of the cable bacteria family.They display a high electrical conductivity, opening perspectives for novel bioelectronic technologies.Here, we shed light on conductive charge-transport (CT) mechanisms by developing CT theoretical models in metal-cable bacterium filament-metal junction, based on incoherent classical and quantum hopping formalisms, that describe conductance experiments for which, there is no theoretical modelling.We propose that conduction through cable bacteria at high temperatures follows an activated Arrhenius temperature-dependence with low activation energy that is a clear signature of classical hopping mechanism including nearest-neighboring near-resonant hopping centers.When lowering the temperature below 80K, the conductivity remains elevated due to quantum-assisted hopping and eventually stabilizes regardless of temperature.
Keywords: electron; transfer; cable; bacteria; hopping