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Title: Quantized conductance coincides with state instability and excess noise in tantalum oxide memristors
Authors: Yi, Wei
Savel'ev, Sergey
Medeiros-Ribeiro, Gilberto
Miao, Feng
Zhang, M.-X.
Yang, J. Joshua
Bratkovsky, A.M.
Williams, R.S.
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: YI, W. ...et al., 2016. Quantized conductance coincides with state instability and excess noise in tantalum oxide memristors. Nature Communications, 7: 11142.
Abstract: Tantalum oxide memristors can switch continuously from a low-conductance semiconducting to a high-conductance metallic state. At the boundary between these two regimes are quantized conductance states, which indicate the formation of a point contact within the oxide characterized by multistable conductance fluctuations and enlarged electronic noise. Here, we observe diverse conductance-dependent noise spectra, including a transition from 1/f 2 (activated transport) to 1/f (flicker noise) as a function of the frequency f, and a large peak in the noise amplitude at the conductance quantum GQ¼2e2/h, in contrast to suppressed noise at the conductance quantum observed in other systems. We model the stochastic behaviour near the point contact regime using Molecular Dynamics–Langevin simulations and understand the observed frequency-dependent noise behaviour in terms of thermally activated atomic-scale fluctuations that make and break a quantum conductance channel. These results provide insights into switching mechanisms and guidance to device operating ranges for different applications.
Description: This is an Open Access Article. It is published by Nature Publishing under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0
Version: Published
DOI: 10.1038/ncomms11142
URI: https://dspace.lboro.ac.uk/2134/21047
Publisher Link: http://dx.doi.org/10.1038/ncomms11142
Appears in Collections:Published Articles (Physics)

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