Zero energy states at a normal-metal/cuprate-superconductor interface probed by shot noise

Negri, Ori; Zaberchik, Moran; Drachuck, Gil; Keren, Amit; Резников, М.

doi:10.1103/physrevb.97.214504

Cited by 2 publications

(1 citation statement)

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“…Zero-energy bound states known also as Majorana zero modes obeying non-Abelian statistics on a two-dimensional high-temperature superconductor were observed in [96]. Zero-energy states were also detected at a normal metal/cuprate-superconductor interface probed by shot noise [97] and at the dirty surface of a nodal superconductor [98].…”

Section: Fluctuations Of the Fractal Gl Systemmentioning

confidence: 99%

Superconductivity and nucleation from fractal anisotropy and product-like fractal measure

El-Nabulsi

2021

Proc. R. Soc. A.

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Superconductivity is analysed based on the product-like fractal measure approach with fractal dimension α introduced by Li and Ostoja-Starzewski in their attempt to explore anisotropic fractal elastic media. Our study shows the emergence of a massless state at the boundary of the superconductor and the simultaneous occurrence of isothermal and adiabatic processes in the superconductor depending on the position of the electrons. Several physical quantities were found to be position-dependent comparable with those arising in heavy doping and p–n junction. At the boundary of the superconductor, a shrinkage of the magnetic field was observed, leading to a scenario equivalent to the Meissner–Ochsenfeld effect. An enhancement of the London penetration depth is revealed and such an improvement was observed in pnictides at the onset of commensurate spin-density-wave order inside the superconducting phase at zero temperature. The Bardeen–Cooper–Schrieffer theory was also analysed and the appearance of zero-energy states is detected. Nucleation of superconductivity in a bulk was also studied. The system acts as a quantum damped harmonic oscillator and our analysis showed that type-I superconductivity occurs when κ < 2 / ( 1 + α ) , whereas type II occurs for κ > 2 / ( 1 + α ) , where κ is the Ginzburg–Landau parameter. The transition at the passage from the ‘genuine’ to the ‘intermediate’ type-I estimates 0.767767 < α ≤ 1 .

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Section: Fluctuations Of the Fractal Gl Systemmentioning

confidence: 99%

Superconductivity and nucleation from fractal anisotropy and product-like fractal measure

El-Nabulsi

2021

Proc. R. Soc. A.

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Electron pairing in the pseudogap state revealed by shot noise in copper oxide junctions

Zhou

Chen

Liu

et al. 2019

Nature

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In the quest to understand high-temperature superconductivity in copper oxides, a vigorous debate has been focused on the pseudogap-a partial gap that opens over portions of the Fermi surface in the 'normal' state above the bulk critical temperature (Tc). 1 The pseudogap has been attributed to precursor superconductivity, to the existence of preformed pairs, or to competing orders such as charge-density waves. 1-4 A direct determination of the charge of carriers as a function of temperature and bias could help resolve among these alternatives. Here, we report measurements of the shot noise of tunneling current in high-quality La2-xSrxCuO4/La2CuO4/La2-xSrxCuO4 (LSCO/LCO/LSCO) heterostructures fabricated using atomic-layer-by-layer molecular beam epitaxy, for several doping levels. The data delineate three distinct regions in the bias voltage-temperature (V-T) space. Well outside the superconducting gap region, the shot noise agrees quantitatively with independent tunneling of charge-e carriers. Deep within the gap, shot noise is greatly enhanced, reminiscent of multiple Andreev reflections. 5-7 Starting above Tc and extending to biases much larger than the gap, there is a broad region in which the noise substantially exceeds the expectations of single-charge tunneling, indicating pairing of carriers. Pairs are detectable deep into the pseudogap region of temperature and bias.

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Zero energy states at a normal-metal/cuprate-superconductor interface probed by shot noise

Cited by 2 publications

References 36 publications

Superconductivity and nucleation from fractal anisotropy and product-like fractal measure

Superconductivity and nucleation from fractal anisotropy and product-like fractal measure

Electron pairing in the pseudogap state revealed by shot noise in copper oxide junctions

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