Deterministic noise in vanadium dioxide based structures

Velichko, Andrei; Стефанович, Г. Б.; Pergament, A. L.; Борисков, П. П.

doi:10.1134/1.1579818

Cited by 14 publications

(16 citation statements)

References 8 publications

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“…Chaotic oscillations have been obviously first observed in [7]. The experimental works have been carried out on single crystals [5,8], thin films [6], [9], [10] and ceramics [7]. Chaotic dynamics and noise effects in vanadium dioxide are of considerable interest because of potential technical applications of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Chaotic dynamics and noise effects in vanadium dioxide are of considerable interest because of potential technical applications of the material. In addition, these effects receive increased attention due to general fundamental interest both in the nonlinear phenomena themselves, and, in particular, in the problem of metal-insulator transitions, because the noise measurements can give valuable information about the transition mechanism [4][5][6], [8], [10]. As for the applied aspect, vanadium oxide films are used for fabrication of a variety of electrical and optical devices, including electrical switching elements, temperature sensors, optical storage devices, variable reflectivity mirrors, IR bolometric detectors [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Velichko¹,

Pergament²,

Stefanovitch³

et al. 2014

Journal on Selected Topics in Nano Electronics and Computing

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Velichko¹,

Pergament²,

Stefanovitch³

et al. 2014

Journal on Selected Topics in Nano Electronics and Computing

Self Cite

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“…The frequency scatter of about 2% is associated with a general instability of the threshold voltage described in Ref. .…”

Section: Resultsmentioning

confidence: 94%

Electron beam modification of vanadium dioxide oscillators

Belyaev

Velichko

Putrolaynen

et al. 2016

Phys. Status Solidi C

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The paper presents the results of a study of electron‐beam modification (EBM) of VO2‐switch I–V curve threshold parameters and the self‐oscillation frequency of a circuit containing such a switching device. EBM in vacuum is reversible and the parameters are restored when exposed to air at pressure of 150 Pa. At EBM with a dose of 3 C cm−2, the voltages of switching‐on (Vth) and off (Vh), as well as the OFF‐state resistance Roff, decrease down to 50% of the initial values, and the oscillation frequency increases by 30% at a dose of 0.7 C cm−2. Features of physics of EBM of an oscillator are outlined considering the contribution of the metal and semiconductor phases of the switching channel. Controlled modification allows EBM forming of switches with preset parameters. Also, it might be used in artificial oscillatory neural networks for pattern recognition based on frequency shift keying.

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“…The current ID1 is varied in the NDR range, from Ih to Ith (0.4 -1 mA), with the steps of 10 μA, though the stable self-oscillation generation is observed not in the entire range, but only within the ID1 values from about 590 to 880 μA. This is due to the fact that, as the operating point approaches the I-V curve thresholds (ID1 → Ih, Ith), the internal noise [22] starts to play an important role and the oscillations transit from a steady state to a burst mode [23]. The dependence of the oscillation frequency F 0 1 on the supply current ID1 is practically linear (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermal coupling and effect of subharmonic synchronization in a system of two VO2 based oscillators

Velichko

Belyaev

Putrolaynen

et al. 2018

Solid-State Electronics

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We explore a prototype of an oscillatory neural network (ONN) based on vanadium dioxide switching devices. The model system under study represents two oscillators based on thermally coupled VO2 switches. Numerical simulation shows that the effective action radius RTC of coupling depends both on the total energy released during switching and on the average power. It is experimentally and numerically proved that the temperature change ΔT commences almost synchronously with the released power peak and T-coupling reveals itself up to a frequency of about 10 kHz. For the studied switching structure configuration, the RTC value varies over a wide range from 4 to 45 μm, depending on the external circuit capacitance C and resistance Ri, but the variation of Ri is more promising from the practical viewpoint. In the case of a "weak" coupling, synchronization is accompanied by attraction effect and decrease of the main spectra harmonics width. In the case of a "strong" coupling, the number of effects increases, synchronization can occur on subharmonics resulting in multilevel stable synchronization of two oscillators. An advanced algorithm for synchronization efficiency and subharmonic ratio calculation is proposed. It is shown that of the two oscillators the leading one is that with a higher main frequency, and, in addition, the frequency stabilization effect is observed. Also, in the case of a strong thermal coupling, the limit of the supply current parameters, for which the oscillations exist, expands by ~ 10 %. The obtained results have a universal character and open up a new kind of coupling in ONNs, namely, T-coupling, which allows for easy transition from 2D to 3D integration. The effect of subharmonic synchronization hold promise for application in classification and pattern recognition.

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Deterministic noise in vanadium dioxide based structures

Cited by 14 publications

References 8 publications

Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Electron beam modification of vanadium dioxide oscillators

Thermal coupling and effect of subharmonic synchronization in a system of two VO2 based oscillators

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