Comment on “The electron glass in a switchable mirror: relaxation, ageing and universality”

Müller, Markus

doi:10.1088/0953-8984/18/5/n01

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…Now we note that these qualitative features are very similar to those observed in many systems during bias excitations [ 33 , 51 , 62 , 92 ] or photoexcitations [ 41 , 58 , 59 , 84 , 85 , 90 , 126 ], as in the above Figure 5 .…”

Section: I(t) Results On Si-sio 2 Nanocomposites U...supporting

confidence: 82%

“…The manifestation of the aging behavior is exhibited in Figure 8 by the nearly ideal “collapse” of the normalized current decays. The deviation from ideality in the experiments is known to be due to some “non-glassy” contributions to the conductivity [ 51 , 62 , 71 ] and, in our case, probably also due to the small contributions of the previous pulses that slightly blur the ideal behavior.…”

Section: I(t) Results On Si-sio 2 Nanocomposites U...mentioning

confidence: 67%

“…In the corresponding measurement, a 40 V dc bias determined I st , the background dc current, which is assumed to be close to the equilibrium (Ohmic-dark) conditions. Upon the application of a rectangular pulse bias of 200 V according to the common protocol of such bias applications [ 33 , 51 , 60 , 61 , 62 , 92 ], the sample was driven to the non-equilibrium regime. In the figure, we show the I(t) response to the application of three consequent pulses with durations or (waiting or excitation) times t w of 1, 2, and 3 h. In view of our interest in the glassy behavior [ 27 , 35 , 36 ], the focus of our study is on the concave I(t) at the excitation regimes and the convex I(t) at the decay relaxation regimes past the corresponding excitations.…”

Section: I(t) Results On Si-sio 2 Nanocomposites U...mentioning

confidence: 99%

“…Concentrating here on the SGB in systems with electrical interactions, we define these systems as having a Coulomb glass behavior (CGB). This is in order to distinguish this rather broad family of electronic systems [28,38,[60][61][62][63][64] from the specific widely studied system of the electron glass [34,57,[65][66][67][68], which is just one member of this family. This member, the so-called "intrinsic" electron glass system [69], is unique by being determined by the Anderson disorder localization at a high n. Here, we concentrate on nanosystems that exhibit the QC-CB effects for which we examine the possibility of a CGB [70].…”

Section: Introductionmentioning

confidence: 99%

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Glassy-like Transients in Semiconductor Nanomaterials

Balberg

2024

Nanomaterials

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Glassy behavior is manifested by three time-dependent characteristics of a dynamic physical property. Such behaviors have been found in the electrical conductivity transients of various disordered systems, but the mechanisms that yield the glassy behavior are still under intensive debate. The focus of the present work is on the effect of the quantum confinement (QC) and the Coulomb blockade (CB) effects on the experimentally observed glassy-like behavior in semiconductor nanomaterials. Correspondingly, we studied the transient electrical currents in semiconductor systems that contain CdSe or Si nanosize crystallites, as a function of that size and the ambient temperature. In particular, in contrast to the more commonly studied post-excitation behavior in electronic glassy systems, we have also examined the current transients during the excitation. This has enabled us to show that the glassy behavior is a result of the nanosize nature of the studied systems and thus to conclude that the observed characteristics are sensitive to the above effects. Following this and the temperature dependence of the transients, we derived a more detailed macroscopic and microscopic understanding of the corresponding transport mechanisms and their glassy manifestations. We concluded that the observed electrical transients must be explained not only by the commonly suggested principle of the minimization of energy upon the approach to equilibrium, as in the mechanical (say, viscose) glass, but also by the principle of minimal energy dissipation by the electrical current which determines the percolation network of the electrical conductivity. We further suggest that the deep reason for the glassy-like behavior that is observed in the electrical transients of the nanomaterials studied is the close similarity between the localization range of electrons due to the Coulomb blockade and the caging range of the uncharged atomic-size particles in the classical mechanical glass. These considerations are expected to be useful for the understanding and planning of semiconductor nanodevices such as corresponding quantum dot memories and quantum well MOSFETs.

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Section: I(t) Results On Si-sio 2 Nanocomposites U...supporting

confidence: 82%

Section: I(t) Results On Si-sio 2 Nanocomposites U...mentioning

confidence: 67%

Section: I(t) Results On Si-sio 2 Nanocomposites U...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glassy-like Transients in Semiconductor Nanomaterials

Balberg

2024

Nanomaterials

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“…They may display quite complex dynamics, and their rather low activation energies are in the same range as the ones of electron correlation or Coulomb gap energies. Thus, from an experimental point of view, we feel that the question remains open, whether we have the simple situation of a collection of independent extrinsic degrees of freedom influencing the current carrying electrons (giving rise to a situation similar to the one suggested recently for another system [49]), or if we observe the result of the highly correlated dynamics of the electron Coulomb glass. Up to now we see no clear-cut experimental result which designates the proper interpretation without ambiguity.…”

Section: Open Questionsmentioning

confidence: 92%

Anomalous electric‐field effect and glassy behaviour in granular aluminium: electron glass?

Grenet¹,

Delahaye²,

Sabra³

et al. 2008

Phys. Status Solidi (c)

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Abstract. We present a study of non-equilibrium phenomena observed in the electrical conductance of insulating granular aluminium thin films. An anomalous field effect and its slow relaxation are studied in some detail. The phenomenology is very similar to the one already observed in indium oxide. The origin of the phenomena is discussed. In granular systems, the present experiments can naturally be interpreted along two different lines. One relies on a slow polarisation in the dielectric surrounding the metallic islands. The other one relies on a purely electronic mechanism: the formation of an electron Coulomb glass in the granular metal. More selective experiments and/or quantitative predictions about the Coulomb glass properties are still needed to definitely distinguish between the two scenarii.

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