Electron glass: Intervalley transitions and the hopping conduction noise

Kogan, Sh. M.

doi:10.1103/physrevb.57.9736

Cited by 53 publications

(23 citation statements)

References 21 publications

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“…This, in part, led Massey and Lee to the conclusion that the single particle picture is inconsistent with the observed noise behavior. A different approach was proposed by Kogan [12] who considered intervalley transitions as the source of the hopping conduction noise. Unfortunately this approach does not seem to be analytically tractable and is not easily generalizable.…”

Section: Introductionmentioning

confidence: 99%

1/fnoise in electron glasses

Shtengel

2003

Phys. Rev. B

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We show that 1/ f noise is produced in a 3D electron glass by charge fluctuations due to electrons hopping between isolated sites and a percolating network at low temperatures. The low frequency noise spectrum goes as ω −α with α slightly larger than 1. This result together with the temperature dependence of α and the noise amplitude are in good agreement with the recent experiments. These results hold true both with a flat, noninteracting density of states and with a density of states that includes Coulomb interactions. In the latter case, the density of states has a Coulomb gap that fills in with increasing temperature. For a large Coulomb gap width, this density of states gives a dc conductivity with a hopping exponent of ≈ 0.75 which has been observed in recent experiments. For a small Coulomb gap width, the hopping exponent ≈ 0.5.

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Section: Introductionmentioning

confidence: 99%

1/fnoise in electron glasses

Shtengel

2003

Phys. Rev. B

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“…An even larger amount of work has been invested in the theoretical aspects of this problem. The pioneering works of Shklovskii [73] were later followed by various other approaches [29,[74][75][76][77][78][79]. In a recent work [61], the mean-field framework has been shown to yield a 1/f noise in the site occupancies, which has not been measured until now, but being a local object is a much simpler property than the conductance noise.…”

Section: B Noise In Electron Glassesmentioning

confidence: 99%

Electron Glass Dynamics

Amir

Oreg

Imry

2011

Annu. Rev. Condens. Matter Phys.

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Examples of glasses are abundant, yet it remains one of the phases of matter whose understanding is very elusive. In recent years, remarkable experiments have been performed on the dynamical aspects of glasses. Electron glasses offer a particularly good example of the 'trademarks' of glassy behavior, such as aging and slow relaxations. In this work we review the experimental literature on electron glasses, as well as the local mean-field theoretical framework put forward in recent years to understand some of these results. We also present novel theoretical results explaining the periodic aging experiment.Comment: Invited review to appear in Annual Review of Condensed Matter Physic

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“…The more important effect of the magnetic field is related to the fact that a presence within the aggregate of the pairs of A  and A   states the magnetic field affects the interlevel spacing E since in one of the states of the pair becomes neutral. If the charged pair corresponds to the upper state, magnetic field increases E by an addition 1 N gH  , where 1 N is the number of the corresponding pairs in the aggregate. Thus the polaron gap created by this aggregate can be destroyed by the field if…”

Section:  mentioning

confidence: 99%

“…In particular, it was shown numerically that such a glass, as the spin glasses, has a huge (supposedly exponentially large) number of pseudoground states ("valleys") which are close in energies and have very small intervalley transition rates [1]. Numerous experimental studies (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Slow relaxation of magnetoresistance in doped p-GaAs/AlGaAs layers with partially filled upper Hubbard band

Agrinskaya

Козуб

Шамшур

et al. 2009

Solid State Communications

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We observed slow relaxation of magnetoresistance in quantum well structures GaAsAlGaAs with a selective doping of both wells and barrier regions which allowed partial filling of the upper Hubbard band. Such a behavior is explained as related to magnetic-field driven redistribution of the carriers between sites with different occupation numbers due to spin correlation on the doubly occupied centers. Such redistribution, in its turn, leads to slow multi-particle relaxations in -Petersburg, RussiaAbstract We observed slow relaxation of magnetoresistance in quantum well structures GaAs-AlGaAs with a selective doping of both wells and barrier regions which allowed partial filling of the upper Hubbard band. Such a behavior is explained as related to magnetic-field driven redistribution of the carriers between sites with different occupation numbers due to spin correlation on the doubly occupied centers. This redistribution, in its turn, leads to slow multiparticle relaxations in the Coulomb glass formed by the charged centers.

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Electron glass: Intervalley transitions and the hopping conduction noise

Cited by 53 publications

References 21 publications

1/fnoise in electron glasses

1/fnoise in electron glasses

Electron Glass Dynamics

Slow relaxation of magnetoresistance in doped p-GaAs/AlGaAs layers with partially filled upper Hubbard band

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