Quantum Fluctuations of a Coulomb Potential as a Source of Flicker Noise

Kazakov, Kirill A.

doi:10.1142/s0217979206033188

Cited by 5 publications

(28 citation statements)

References 8 publications

(12 reference statements)

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“…In Refs. [9,10], the role of quantum effects is considered from a purely nonrelativistic point of view. In Ref.…”

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confidence: 99%

“…This result was applied in Ref. [10] to the calculation of the power spectrum of electromagnetic fluctuations produced by a sample. It was proved, in particular, that the power spectrum possesses the properties 1), 2) of flicker noise, mentioned above.…”

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confidence: 99%

“…As to the property 3), it was argued in Ref. [10] that this requirement is also met. The argument was based on the assumption of analyticity of the electron density matrix with respect to the external electric field.…”

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confidence: 99%

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Quantum fluctuations of the Coulomb potential as a source of flicker noise: the influence of external electric field

Kazakov

2006

J. Phys. A: Math. Gen.

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Fluctuations of the electromagnetic field produced by quantized matter in external electric field are investigated. A general expression for the power spectrum of fluctuations is derived within the long-range expansion. It is found that in the whole measured frequency band, the power spectrum of fluctuations exhibits an inverse frequency dependence. A general argument is given showing that for all practically relevant values of the electric field, the power spectrum of induced fluctuations is proportional to the field strength squared. As an illustration, the power spectrum is calculated explicitly using the kinetic model with the relaxation-type collision term. Finally, it is shown that the magnitude of fluctuations produced by a sample generally has a Gaussian distribution around its mean value, and its dependence on the sample geometry is determined. In particular, it is demonstrated that for geometrically similar samples, the power spectrum is inversely proportional to the sample volume. Application of the obtained results to the problem of flicker noise is discussed.

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“…In Refs. [9,10], the role of quantum effects is considered from a purely nonrelativistic point of view. In Ref.…”

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confidence: 99%

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confidence: 99%

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Quantum fluctuations of the Coulomb potential as a source of flicker noise: the influence of external electric field

Kazakov

2006

J. Phys. A: Math. Gen.

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“…An essentially different quantum approach to the problem was proposed recently in Refs. [23,24]. In this approach, flicker noise is treated as originating from quantum fluctuations of individual electric fields of charge carriers.…”

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confidence: 99%

Quantum theory of flicker noise in metal films

Kazakov

2008

Physica B: Condensed Matter

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Flicker (1/f γ ) voltage noise spectrum is derived from finite-temperature quantum electromagnetic fluctuations produced by elementary charge carriers in external electric field. It is suggested that deviations of the frequency exponent γ from unity, observed in thin metal films, can be attributed to quantum backreaction of the conducting medium on the fluctuating field of the charge carrier. This backreaction is described phenomenologically in terms of the effective momentum space dimensionality, D. Using the dimensional continuation technique, it is shown that the combined action of the photon heat bath and external field results in a 1/f γ -contribution to the spectral density of the two-point correlation function of electromagnetic field. The frequency exponent is found to be equal to 1+δ, where δ = 3−D is a reduction of the momentum space dimensionality. This result is applied to the case of a biased conducting sample, and a general expression for the voltage power spectrum is obtained which possesses all characteristic properties of observed flicker noise spectra. The range of validity of this expression covers well the whole measured frequency band. Gauge independence of the power spectrum is proved. It is shown that the obtained results naturally resolve the problem of divergence of the total noise power. A detailed comparison with the experimental data on flicker noise measurements in metal films is given.

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“…It is plausible that this phenomenon has its roots in the very quantum nature of interaction of elementary charges with electromagnetic field. The zero-temperature analysis of [3] will be generalized below to take into account finite temperature effects. An essentially different quantum approach to the problem was recently proposed [3], in which flicker noise is treated as originating from quantum fluctuations of the Coulomb poten-tials produced by individual charge carriers.…”

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Flicker Noise From Quantum Fluctuations of the Coulomb Potential

Kazakov¹

2007

AIP Conference Proceedings

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On the origin of low frequency noise in GaAs metal-semiconductor field-effect transistors Abstract. Power spectrum of finite-temperature quantum electromagnetic fluctuations produced by elementary charge carriers under the influence of external electric field is determined. Its lowfrequency asymptotic is shown to possess all characteristic properties of observed flicker noise spectra. In application to the case of a biased conducting sample, the obtained result gives the voltage power spectrum proportional to the charge carrier mobility, the absolute system temperature, the bias voltage squared, and a factor describing dependence of the noise amplitude on the sample geometry. It is demonstrated that the derived expression is in agreement with the experimental data on flicker noise measurements in metal films.

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Quantum Fluctuations of a Coulomb Potential as a Source of Flicker Noise

Cited by 5 publications

References 8 publications

Quantum fluctuations of the Coulomb potential as a source of flicker noise: the influence of external electric field

Quantum fluctuations of the Coulomb potential as a source of flicker noise: the influence of external electric field

Quantum theory of flicker noise in metal films

Flicker Noise From Quantum Fluctuations of the Coulomb Potential

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