Excessive noise as a test for many-body localization

Tamir, Idan; Levinson, T.; Gorniaczyk, F.; Doron, A.; Lieb, J.; Shahar, D.

doi:10.1103/physrevb.99.035135

Cited by 13 publications

(10 citation statements)

References 48 publications

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“…We do not see maximum for S2-2 and S2-3 since for superconducting samples it appears at higher fields 12 . As was shown in details in 23 , in constant magnetic field sample S2-1 demonstrates the temperature-driven charge BKT transition into superinsulating state 23, 37 -the state also found in the InO films 38,39 .…”

Section: Suppression Of Superconductivity In Set-2supporting

confidence: 63%

Superconducting phase transitions in disordered NbTiN films

Burdastyh

Postolova

Proslier

et al. 2020

Sci Rep

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The suppression of superconductivity in disordered systems is a fundamental problem of condensed matter physics. Here we investigate the superconducting niobium-titanium-nitride (Nb 1−x TixN) thin films grown by atomic layer deposition (ALD) where disorder is controlled by the slight tuning of the ALD process parameters. We observe the smooth crossover from the disorderdriven superconductor-normal metal transition (often reffered to as fermionic mechanism) to the case where bosonic mechanism dominates and increasing disorder leads to formation of metal with Cooper pairing. We show that, in 'moderately' disordered films, the transition to zero-resistance state occurs in a full agreement with the conventional theories of superconducting fluctuations and Berezinskii-Kosterlitz-Thouless transition. However, the 'critically' disordered films violate this accord showing low-temperature features possibly indicating the Bose metal phase. We show that it is the interrelation between film's sheet resistance in the maximum, Rmax, of the resistive curve R✷(T ) and Rq = h/4e 2 that distinguishes between these two behaviors. We reveal the characteristic features in magnetoresistance of the 'critically' disordered films with Rmax > Rq. 2/9

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Section: Suppression Of Superconductivity In Set-2supporting

confidence: 63%

Superconducting phase transitions in disordered NbTiN films

Burdastyh

Postolova

Proslier

et al. 2020

Sci Rep

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“…The dielectric breakdown is usually accompanied by current noise. Such a noise has indeed been recently observed in InO films [31]. Experiments demonstrating the linear dependence of the threshold voltage on the sample size in films are still to come.…”

Section: Experimental Implicationsmentioning

confidence: 58%

Confinement and asymptotic freedom with Cooper pairs

2018

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One of the most profound aspects of the standard model of particle physics, the mechanism of confinement binding quarks into hadrons, is not sufficiently understood. The only known semiclassical mechanism of confinement, mediated by chromo-electric strings in a condensate of magnetic monopoles still lacks experimental evidence. Here we show that the infinite resistance superinsulating state, which emerges on the insulating side of the superconductor-insulator transition in superconducting films offers a realization of confinement that allows for a direct experimental access. We find that superinsulators realize a single-color version of quantum chromodynamics and establish the mapping of quarks onto Cooper pairs. We reveal that the mechanism of superinsulation is the linear binding of Cooper pairs into neutral "mesons" by electric strings. Our findings offer a powerful laboratory for exploring and testing the fundamental implications of confinement, asymptotic freedom, and related quantum chromodynamics phenomena via the desktop experiments on superconductors.

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“…This critical behaviour has also been recently experimentally observed in InO films [29], which have a thickness d ξ, making them good candidates for 3D superinsulators. This is confirmed also by the apparent violation of charge-vortex duality in InO films [30]: in 3D, duality is between electric and magnetic fields, not between charges and vortices. A further confirmation of the string confinement picture of superinsulation comes from the recent measurement of strong noise near the threshold voltage [30].…”

mentioning

confidence: 67%

“…This is confirmed also by the apparent violation of charge-vortex duality in InO films [30]: in 3D, duality is between electric and magnetic fields, not between charges and vortices. A further confirmation of the string confinement picture of superinsulation comes from the recent measurement of strong noise near the threshold voltage [30]. Indeed, the threshold voltage corresponds to the critical strength when an applied voltage starts creating strips of normal insulator, carrying the current, mixed with the superinsulating matrix.…”

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confidence: 67%

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The Superconductor-Superinsulator Transition: S-duality and the QCD on the Desktop

Diamantini

Gammaitoni

Trugenberger

et al. 2018

J Supercond Nov Magn

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We show that the nature of quantum phases around the superconductor-insulator transition (SIT) is controlled by charge-vortex topological interactions, and does not depend on the details of material parameters and disorder. We find three distinct phases, superconductor, superinsulator and bosonic topological insulator. The superinsulator is a state of matter with infinite resistance in a finite temperatures range, which is the S-dual of the superconductor and in which charge transport is prevented by electric strings binding charges of opposite sign. The electric strings ensuring linear confinement of charges are generated by instantons and are dual to superconducting Abrikosov vortices. Material parameters and disorder enter the London penetration depth of the superconductor, the string tension of the superinsulator and the quantum fluctuation parameter driving the transition between them. They are entirely encoded in four phenomenological parameters of a topological gauge theory of the SIT. Finally, we point out that, in the context of strong coupling gauge theories, the many-body localization phenomenon that is often referred to as an underlying mechanism for superinsulation is a mere transcription of the well-known phenomenon of confinement into solid state physics language and is entirely driven by endogenous disorder embodied by instantons with no need of exogenous disorder.The superconductor-insulator transition (SIT) [1-7] is a paradigmatic quantum phase transition found in Josephson junction arrays (JJA) [1,6] and in 2D disordered superconducting films at low temperatures T [2-5]. The tuning parameter driving the SIT is the ratio of the single junction Coulomb energy to the Josephson coupling. In 2D films this ratio is effectively controlled by varying the film thickness d which regulates the strength of disorder and hence of Coulomb screening or by applying a magnetic field that suppresses the Josephson coupling. This can cause a dramatic change in the ground state so that superconductivity is lost in favour of insulating behaviour.In 1978, G. 't Hooft [8] appealed to a solid state physics analogy in a Gedankenexperiment to explain quark confinement and demonstrated that this is realized in a phase which is in many respects similar to the superconducting phase, but is in a sense a zero particle mobility phase, the extreme opposite of a superconductor and called hence this phase a "superinsulator." In 1996, two of the present authors (mcd and cat) [9] developed a comprehensive field theory framework for the description of the SIT in JJA. They predicted that, on the insulating side of the SIT, a new ground state forms, corresponding to a novel phase with infinite resistance. This novel phase is dual to the superconductor, characterized by zero resistance, and they thus independently also called this phase a superinsulator. Independently, superinsulators where also soon proposed in [10]. Finally, the name and phenomenon of superinsulation was rediscovered and experimentally detected by one of the authors (...

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Excessive noise as a test for many-body localization

Cited by 13 publications

References 48 publications

Superconducting phase transitions in disordered NbTiN films

Superconducting phase transitions in disordered NbTiN films

Confinement and asymptotic freedom with Cooper pairs

The Superconductor-Superinsulator Transition: S-duality and the QCD on the Desktop

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