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This is due to the fact that the drifting of oxygen vacancies (state variables of the memristor) are highly nonlinear when switching occurred.
At the nanoscale, current threshold for resistive switching seems to be operational and the rate of drifting of oxygen vacancies (state variable of memristor) is higher at a particular range of bias and lower for other bias.
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However, when two vacancies reside on the edges, the conductance remain unchanged compared to that of perfect GNRs due to the interaction between vacancy state and edge state.
The magnetic transitions in the central device, which is associated with the reversal of spin polarization of the π band of the vacancy state, lead to current flip with a spin filtering efficiency up to 17% (and a maximum change by 24% upon distortion).
In the process, a single photon is emitted by the atom with an energy equal to the difference between the inner-shell and outer-shell vacancy states.
The oxygen vacancy states that may capture electrons are F + and F ++, respectively.
This reduced absorption in the visible region clearly indicates the reduction of oxygen vacancy states after RTA processing.
PL emission spectra of Er-doped ZnS urchinlike architectures indicated that Er doping can increase sulfur vacancies and extended sulfur-vacancy states.
Besides, the hydrogen doping into TiO2 generates oxygen vacancy states, providing additional charge transfer pathway and prohibiting charge recombination, beneficial for enhancing the PEC performances as well.
Liu et al. related the green emission observed over sphalerite ZnS to some self-activated centers, probably vacancy states or interstitial states of the peculiar structure [20].
It was first found that its broad blue emission is originated not from zinc vacancies or just sulfur vacancies but from sulfur vacancies as well as extended sulfur-vacancy states.
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