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Stability and Conductivity of Self Assembled Wires in a Transverse Electric Field

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Stability and Conductivity of Self Assembled Wires in a Transverse Electric Field

C Stephenson et al. Sci Rep.

Abstract

Self assembling wire networks typically evolve to minimize the resistance across electrical contacts which are frequently used in a manner comparable to Hebbian learning. In this work, we demonstrate that electrical fields can also be used to cause an increase in the resistance of the wire network. We show that if such a wire is exposed to a transverse electric field, the wire is deformed in a way that depends on it's tensile strength. We measure the wire resistance as a function of transverse field for several field strengths and show that by deforming the wire, the amplitude of the resulting shape can be modified in a controllable fashion. At a critical value of the transverse field, we show that the wire loses stability. At this point we observe thresholding behavior in that the resistance increases abruptly to a maximum value and the wire is destroyed. This thresholding behavior suggests that self assembled wires may be manipulated via an transverse electric field and demonstrates that a mechanism exists for the destruction of undesirable connections.

Figures

Figure 1
Figure 1. Resistance of a gap with one particle as a function of gap size.
The blue line shows a best fit to Eq. 9 for the constant A = 0.379 mm3/GΩ.
Figure 2
Figure 2. Wire formed at ΔV = 25 kV showing a typical wire at zero transverse field and the deformed wire after the transverse field is switched on.
Figure 3
Figure 3. Displacement of a 25 particle wire when exposed to a V^ = 2 kV transverse voltage with an ΔV = 18 kV primary voltage compared to the theoretical curve for the best-fit value of c/T = 9.1 * 10−5F/N as defined in Eq. 15.
Figure 4
Figure 4. Amplitude of wire displacement of a 25 particle wire as a function of transverse voltage with a ΔV = 25 kV primary voltage compared to the the theoretical curve as defined in equation 16 for the best fit value of c/T = 7.1 * 10−6F/N.
Figure 5
Figure 5. Resistance vs. transverse voltage showing a transition at Vc = 8.5 kV +/− 0.7 kV.
The blue line is a best fit step-function with a low resistance of R = 198 GΩ and a high resistance of R = 693 GΩ with the transition at Vc = 8.5 kV.
Figure 6
Figure 6. Particle chain.
Figure 7
Figure 7. Diagram of the wire experiment.
Figure 8
Figure 8. Diagram of the shuttle experiment.

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References

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