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Molecular wires and logic circuits integration in a single molecule?

C. Joachim

Keywords: logic circuits

Hybrid Molecular electronics (one molecule per device) do not offer good perspectives of miniaturization on the long term. The full integration, at the nanoscale, of a calculator will demand all the power of the quantum states superposition to run the quantum machine. To design a quantum computing nano-machine, trend (1) is to design a very molecule with a spatial intramolecular electronic circuits mastering the super-exchange mechanism. Trend (2) is to structure the molecules in qbits leading to time circuits. For (1) progresses in our understanding of the tunnel transport phenomenon through a molecular wires will be presented with the differences between saturated, conjugated molecular wires and atomic wires. Circuit rules for “in series and in parallel” bonding of molecular wires groups to form a longer molecular wire or a molecular circuit are discussed. They differ from the well known G. Kirchhoff electrical circuits laws. Simple OR and AND gate integrated inside a single molecule are detailed underlining our difficulties to design larger intramolecular logic circuit in the spatial domain and pointing a mixed approach between technology (1) and (2). References: C. Joachim, Nanotechnology, 13, R1 (2002) C. Joachim and M. Magoga, Chem. Phys., 281, 347 (2002) S. Ami and C. Joachim, Phys. Rev. B, 65, 155419 (2002) C. Joachim, J.K. Gimzewski and A. Aviram, Nature, 408, 541 (2000) M. Magoga and C. Joachim, Phys. Rev. B, 59, 16011 (1999) M. Magoga and C. Joachim, Phys. Rev. B, 57, 1820 (1998) M. Magoga and C. Joachim, Phys. Rev. B, 56, 4722 (1997) C. Joachim and J. Vinuesa, EuroPhys. Lett., 33, 635 (1996)

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