Alik Kasumov (RIKEN) Conductivity and induced Superconductivity in DNA
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Limits for Molecular Electronics: Q = 50W/cm2 maximum heat removal, N = 1012/cm2
density of devices.
Graph of Log[P(W)] vs. Log [td(s)].
The Heisenberg principle restriction Emin =h/td, and
Von Neuman restriciton: Emin = ln(2)kT, T=300K.
Must resort to superconducting molecular computer to be able to handle energy
dissipation, etc. Schematic picture of DNA is compressed at surfaces, even seen in TEM
shadow images. Image simultaneous in topography and "spreading resistance mode".
Without pentylamine treatment it is an insulator. With pentylamine it is a conductor.
Used combing of λ-DNA molecules to orient across IC slits. Low-temperature
conductivity of DNA in differential voltage imaging. DNA molecules between metallic
electrodes: if height of electrode is >3nm, cannot establish conductivity along the wires.
Surface preparation (height of molecules) DNA molecules prepared in this way have
resistances of ≈ 100 kΩ/molecule. Proximity induced superconductivity in DNA
molecules: contacts RE/C Tc≈1K. DNA behaves like a doped semiconductor.
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