211 research outputs found
Experimental demonstration of associative memory with memristive neural networks
When someone mentions the name of a known person we immediately recall her face and possibly many other traits. This is because we possess the so-called associative memory - the ability to correlate different memories to the same fact or event. Associative memory is such a fundamental and encompassing human ability (and not just human) that the network of neurons in our brain must perform it quite easily. The question is then whether electronic neural networks - electronic schemes that act somewhat similarly to human brains - can be built to perform this type of function. Although the field of neural networks has developed for many years, a key element, namely the synapses between adjacent neurons, has been lacking a satisfactory electronic representation. The reason for this is that a passive circuit element able to reproduce the synapse behaviour needs to remember its past dynamical history, store a continuous set of states, and be "plastic" according to the pre-synaptic and post-synaptic neuronal activity. Here we show that all this can be accomplished by a memory-resistor (memristor for short). In particular, by using simple and inexpensive off-the-shelf components we have built a memristor emulator which realizes all required synaptic properties. Most importantly, we have demonstrated experimentally the formation of associative memory in a simple neural network consisting of three electronic neurons connected by two memristor-emulator synapses. This experimental demonstration opens up new possibilities in the understanding of neural processes using memory devices, an important step forward to reproduce complex learning, adaptive and spontaneous behaviour with electronic neural networks
Electronic signature of DNA nucleotides via transverse transport
We report theoretical studies of charge transport in single-stranded DNA in
the direction perpendicular to the backbone axis. We find that, if the
electrodes which sandwich the DNA have the appropriate spatial width, each
nucleotide carries a unique signature due to the different electronic and
chemical structure of the four bases. This signature is independent of the
nearest-neighbor nucleotides. Furthermore, except for the nucleotides with
Guanine and Cytosine bases, we find that the difference in conductance of the
nucleotides is large for most orientations of the bases with respect to the
electrodes. By exploiting these differences it may be possible to sequence
single-stranded DNA by scanning its length with conducting probes.Comment: 4 pages, 5 figure
Stochastic quantum molecular dynamics for finite and extended systems
We present a detailed account of the technical aspects of stochastic quantum
molecular dynamics, an approach introduced recently by the authors [H. Appel
and M. Di Ventra, Phys. Rev. B 80 212303 (2009)] to describe coupled
electron-ion dynamics in open quantum systems. As example applications of the
method we consider both finite systems with and without ionic motion, as well
as describe its applicability to extended systems in the limit of classical
ions. The latter formulation allows the study of important phenomena such as
decoherence and energy relaxation in bulk systems and surfaces in the presence
of time-dependent fields
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