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Anomalous transverse resistance in the topological superconductor β-Bi₂Pd.

ABSTRACT: A supercurrent flowing in a superconductor meets no resistance. Yet an electric field may still be established within the superconductor in the presence of dissipative processes, such as vortex motion. Here we report the observation of a transverse voltage drop in superconducting β-Bi₂Pd thin films. Unlike the Hall effect in general or in other superconductors, the sign of the observed transverse voltage does not depend on the external magnetic field. Instead, it is dictated by the broken inversion symmetry on the film interfaces. This anomalous transverse voltage, or transverse resistance, is indicative of a chirality that likely resonates with the topological surface states reported in β-Bi₂Pd.

SUBMITTER: Xu X

PROVIDER: S-EPMC9463149 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Anomalous transverse resistance in the topological superconductor β-Bi<sub>2</sub>Pd.

Xu Xiaoying X Li Yufan Y Chien C L CL

Nature communications 20220909 1

A supercurrent flowing in a superconductor meets no resistance. Yet an electric field may still be established within the superconductor in the presence of dissipative processes, such as vortex motion. Here we report the observation of a transverse voltage drop in superconducting β-Bi<sub>2</sub>Pd thin films. Unlike the Hall effect in general or in other superconductors, the sign of the observed transverse voltage does not depend on the external magnetic field. Instead, it is dictated by the br ...[more]

PMID: 36085297

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Project description:BackgroundSkeletal muscle fibres contain transverse tubular (t-tubule) networks that allow electrical signals to rapidly propagate into the fibre. These electrical signals are generated by the transport of ions across the t-tubule membranes and this can result in significant changes in ion concentrations within the t-tubules during muscle excitation. During periods of repeated high-frequency activation of skeletal muscle the t-tubule K+ concentration is believed to increase significantly and diffusive K+ transport from the t-tubules into the interstitial space provides a mechanism for alleviating muscle membrane depolarization. However, the tortuous nature of the highly branched space-filling t-tubule network impedes the diffusion of material through the network. The effective diffusion coefficient for ions in the t-tubules has been measured to be approximately five times lower than in free solution, which is significantly different from existing theoretical values of the effective diffusion coefficient that range from 2-3 times lower than in free solution. To resolve this discrepancy, in this paper we study the process of diffusion within electron microscope scanned sections of the skeletal muscle t-tubule network using mathematical modelling and computer simulation techniques. Our model includes t-tubule geometry, tautness, hydrodynamic and non-planar network factors.ResultsUsing our model we found that the t-tubule network geometry reduced the K+ diffusion coefficient to 19-27% of its value in free solution, which is consistent with the experimentally observed value of 21% and is significantly smaller than existing theoretical values that range from 32-50%. We also found that diffusion in the t-tubules is anomalous for skeletal muscle fibres with a diameter of less than approximately 10-20 microm as a result of obstructed diffusion. We also observed that the [K+] within the interior of the t-tubule network during high-frequency activation is greater for fibres with a larger diameter. Smaller skeletal muscle fibres are therefore more resistant to membrane depolarization. Because the t-tubule network is anisotropic and inhomogeneous, we also found that the [K+] distribution generated within the network was irregular for fibres of small diameter.ConclusionOur model explains the measured effective diffusion coefficient for ions in skeletal muscle t-tubules.

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Anomalous transverse resistance in the topological superconductor β-Bi₂Pd.

Publications

Anomalous transverse resistance in the topological superconductor β-Bi<sub>2</sub>Pd.

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Anomalous transverse resistance in the topological superconductor β-Bi2Pd.

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Anomalous transverse resistance in the topological superconductor β-Bi<sub>2</sub>Pd.

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OmicsDI is part of the ELIXIR infrastructure

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Anomalous transverse resistance in the topological superconductor β-Bi₂Pd.