Quantum penetration depth

Duration: 14min 20sec Views: 995 Submitted: 30.01.2021
Category: Cumshot
We present a general theory of the singularity in the London penetration depth at symmetry-breaking and topological quantum critical points within a superconducting phase. While the critical exponents and ratios of amplitudes on the two sides of the transition are universal, an overall sign depends upon the interplay between the critical theory and the underlying Fermi surface. We determine these features for critical points to spin density wave and nematic ordering, and for a topological transition between a superconductor with Z 2 fractionalization and a conventional superconductor. Hashimoto et al.

Barrier Penetration

Singularity of the London Penetration Depth at Quantum Critical Points in Superconductors

It became clear that the magnetic field penetration depth is abnormally long. It is the first superconductor in the antiperovskite oxide, and the possibility of topological superconductivity has been theoretically proposed. Since the spin precesses under a magnetic field the same phenomenon that a spinning top turns around before it collapses , when the direction of the spin is measured with time, the oscillation shown in the figure at the top of this page is observed. The horizontal axis of the figure is time, and when the asymmetry in the vertical axis is positive, the spin is forward, and when it is negative, the spin is backward. Since the magnetic flux is quantized in the superconducting state, the magnitude of the magnetic field varies slightly depending on the location of the sample. Therefore, it seems that the amplitude of the precession decreases as a whole because each muon precesses at different period. In the figure at the top of the page, the amplitude does not change in the red data obtained at 7 K above the superconducting transition temperature, whereas the amplitude decreases with time in the blue data obtained at 1.

Penetration of CdSe/ZnS quantum dots into differentiated vs undifferentiated Caco-2 cells

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The changing of edge orientation from armchair to zigzag direction decreases the penetration depth drastically.