Electron Glass

Davies, John H.; Lee, P. A.; Rice, T. M.

doi:10.1103/physrevlett.49.758

Cited by 259 publications

(241 citation statements)

References 11 publications

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“…Glassy phases of fermions have long been predicted to exist in Coulomb frustrated semiconductors, so-called electron-or Coulomb glasses [21]; in our case, the fermionic atoms play the role of the electrons in these earlier studies. In these electronic systems frustration results naturally from a competition between long range Coulomb repulsions and the random po-sitions and energies of impurity sites.…”

Section: Introductionmentioning

confidence: 99%

Quantum charge glasses of itinerant fermions with cavity-mediated long-range interactions

Müller¹,

Strack²,

Sachdev³

2012

Phys. Rev. A

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The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters. We study models of itinerant spinless fermions with random long-range interactions. We motivate such models from descriptions of fermionic atoms in multi-mode optical cavities. The solution of an infinite-range model yields a metallic phase which has glassy charge dynamics, and a localized glass phase with suppressed density of states at low energies. We compare these phases to the conventional disordered Fermi liquid, and the insulating electron glass of semiconductors. Prospects for the realization of such glassy phases in cold atom systems are discussed.

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Section: Introductionmentioning

confidence: 99%

Quantum charge glasses of itinerant fermions with cavity-mediated long-range interactions

Müller¹,

Strack²,

Sachdev³

2012

Phys. Rev. A

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“…Here we examine under which condition a high density system can be described by the classical Hamiltonian (1). The aim is to consider only a strip of localized states of width ∆E around the chemical potential, and to work with an effective model of occupied and empty levels within this strip.…”

Section: Appendix B: Reduction Of High Density Systems To the Standarmentioning

confidence: 99%

Memory effect in electron glasses: Theoretical analysis via a percolation approach

Lebanon

Müller

2005

Phys. Rev. B

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We present a theory for the memory effect in electron glasses. In fast gate voltage sweeps it is manifested as a dip in the conductivity around the equilibration gate voltage. We show that this feature, also known as anomalous field effect, arises from the long-time persistence of correlations in the electronic configuration. We argue that the gate voltage at which the memory dip saturates is related to an instability caused by the injection of a critical number of excess carriers. This saturation threshold naturally increases with temperature. On the other hand, we argue that the gate voltage beyond which memory is erased, is temperature independent. Using standard percolation arguments, we calculate the anomalous field effect as a function of gate voltage, temperature, carrier density and disorder. Our results are consistent with experiments, and in particular, they reproduce the observed scaling of the width of the memory dip with various parameters.

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“…Those islands which V D has been shifted above e/2c loose one more electron (then Q = 2e) so that they enter [-e/2c, + e/2c] again, filling the gap near V D = -e/2c (5). The increase of electric field created by the extra charging again polarizes the dielectric surrounding the islands with Q = 2e, which potential is once more shifted upward (6). The result of that series of processes is a gap near…”

Section: Discussionmentioning

confidence: 99%

“…However as the relaxations to the equilibrium state are logarithmic in time, once a sample has been allowed to relax for a sufficient time (say 6 one or a few days), the field effect curve evolves very slowly and does not change significantly during a typical measurement time. We can thus define and study "steady" properties of the cusp, and observe the following features:…”

Section: "Steady" Properties Of the Cuspmentioning

confidence: 99%

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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Electron Glass

Cited by 259 publications

References 11 publications

Quantum charge glasses of itinerant fermions with cavity-mediated long-range interactions

Quantum charge glasses of itinerant fermions with cavity-mediated long-range interactions

Memory effect in electron glasses: Theoretical analysis via a percolation approach

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

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