Metamaterial superconductors

Smolyaninov, Igor I.; Smolyaninova, Vera N.

doi:10.1103/physrevb.91.094501

Cited by 26 publications

(51 citation statements)

References 29 publications

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“…The dominant mechanism behind the enhanced transmission in Ag NSEs is most likely the excitation of standing surface plasmon polariton (SPP) Bloch waves on the periodically nanostructured interfaces of the Ag film. Since the SPPs of the nanostructured metal interfaces are strongly coupled to each other and to free space; they appear to be mostly responsible for the observed extraordinary optical transmission [40]. A key fact is that this tendency is known to be associated with the periodicity of the nanostructure [41] and one may optimize the periodicity to www.pss-a.com achieve maximum transparency.…”

Section: Ag Nanopillar Arraymentioning

confidence: 99%

Fabrication, electrical and optical properties of silver, indium tin oxide (ITO), and indium zinc oxide (IZO) nanostructure arrays

Khosroabadi

Gangopadhyay

Duong

et al. 2013

Physica Status Solidi (a)

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In thin film devices such as light-emitting diodes, photovoltaic cells and field-effect transistors, the processes of charge injection, charge transport, charge recombination, separation and collection are critical to performance. Most of these processes are relevant to nanoscale metal and metal oxide electrode-organic material interfacial phenomena. In this report we present a unique method for creating tailored onedimensional nanostructured silver, tin and/or zinc substituted indium oxide electrode structures over large areas. The method allows production of high aspect ratio nanoscale structures with feature sizes below 100 nm and a large range of dimensional tunability. We observed that both the electronic and optical properties of these electrodes are closely correlated to the nanostructure dimensions and can be easily tuned by control of the feature size. Surface area enhancement accurately describes the conductivity studies, while nanostructure dependent optical properties highlight the quasi-plasmonic nature of the electrodes. Optimization of the nanostructured electrode transparency and conductivity for specific opto-electronic systems is expected to provide improvement in device performance.

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Section: Ag Nanopillar Arraymentioning

confidence: 99%

Fabrication, electrical and optical properties of silver, indium tin oxide (ITO), and indium zinc oxide (IZO) nanostructure arrays

Khosroabadi

Gangopadhyay

Duong

et al. 2013

Physica Status Solidi (a)

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“…Based on this approach, Kirzhnits The key observation made in Refs. [1,2] was that the "homogeneous medium" approximation may remain valid even if the basic structural elements of the material are not simple atoms or molecules. It was suggested that artificial "metamaterials" may be created from much bigger building blocks, and the electromagnetic properties of these fundamental building blocks may be engineered in such a way that the attractive pairing interaction described by Eq.…”

Section: Macroscopic Electrodynamic Description Of Superconductivitymentioning

confidence: 99%

“…(1) is maximized. The two potential solutions described in [1,2] require minimization of  eff (q,) within a substantial portion of the relevant fourmomentum spectrum ( keeping the real part of  eff (q,) negative. These solutions involve either the epsilonnear-zero (ENZ) [7], or hyperbolic metamaterial [8] scenarios, which naturally lead to broadband small and negative  eff (q,) behavior in substantial portions of the relevant four-momentum spectrum.…”

Section: Macroscopic Electrodynamic Description Of Superconductivitymentioning

confidence: 99%

Metamaterial superconductors

Smolyaninov

Smolyaninova

2018

Nanophotonics

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Searching for natural materials exhibiting larger electron-electron interactionsconstitutes a traditional approach to high temperature superconductivity research.Very recently we pointed out that the newly developed field of electromagnetic metamaterials deals with the somewhat related task of dielectric response engineering on a sub-100 nm scale. Considerable enhancement of the electronelectron interaction may be expected in such metamaterial scenarios as in epsilon near zero (ENZ) and hyperbolic metamaterials. In both cases dielectric function may become small and negative in substantial portions of the relevant fourmomentum space, leading to enhancement of the electron pairing interaction. This approach has been verified in experiments with aluminium-based metamaterials. Metamaterial superconductor with Tc = 3.9 K have been fabricated, that is three times that of pure aluminium (Tc = 1.2 K), which opens up new possibilities to considerably improve Tc of other simple superconductors. Taking advantage of the demonstrated success of this approach, the critical temperature of hypothetic niobium, MgB2 and H 2 S-based metamaterial superconductors is evaluated. The MgB 2 -based metamaterial superconductors are projected to reach the liquid nitrogen temperature range. In the case of an H 2 S-based metamaterial projected Tc appears to reach ~250 K.

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“…The strong enhancement of superconducting T c in the mono-layer FeAs or FeSe on SrTiO 3 substrate is deeply related to the interfacial optical phonon mode [11,[24][25][26][27]. Attempts of using Boson other than phonons, such as the plasma in meta-materials, to mediate the electron-electron attraction also appear promising [28,29].…”

Section: Introductionmentioning

confidence: 99%

Optimal boson energy for superconductivity in the Holstein model

2016

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We examine the superconducting solution in the Holstein model, where the conduction electrons couple to the dispersionless Boson fields, using the Migdal-Eliashberg theory and Dynamical Mean Field Theory. Although different in numerical values, both methods imply the existence of an optimal Boson energy for superconductivity at a given electron-Boson coupling. This non-monotonous behavior can be understood as an interplay between the polaron and superconducting physics, as the electron-Boson coupling is the origin of the superconductor, but at the same time traps the conduction electrons making the system more insulating. Our calculation provides a simple explanation on the recent experiment on sulfur hydride, where an optimal pressure for the superconductivity was observed. The validities of both methods are discussed.

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Metamaterial superconductors

Cited by 26 publications

References 29 publications

Fabrication, electrical and optical properties of silver, indium tin oxide (ITO), and indium zinc oxide (IZO) nanostructure arrays

Fabrication, electrical and optical properties of silver, indium tin oxide (ITO), and indium zinc oxide (IZO) nanostructure arrays

Metamaterial superconductors

Optimal boson energy for superconductivity in the Holstein model

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