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Related Concept Videos

Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Josephson supercurrent through a topological insulator surface state.

M Veldhorst, M Snelder, M Hoek

    Nature Materials
    |February 21, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Researchers observed Josephson supercurrents in superconductor-topological insulator junctions, a key step toward finding Majorana fermions. This finding opens new avenues for topological quantum computing and emergent particle research.

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    Area of Science:

    • Condensed matter physics
    • Materials science
    • Quantum computing

    Background:

    • Majorana fermions are exotic particles predicted to exist at the intersection of superconductivity and topological insulators.
    • Observing supercurrent in a topological phase is crucial for detecting these elusive particles.
    • Previous research has theoretically proposed and experimentally sought such phenomena.

    Discussion:

    • This study presents direct evidence of Josephson supercurrents in superconductor (Nb)-topological insulator (Bi(2)Te(3))-superconductor junctions.
    • The observed Shapiro steps and Fraunhofer-type critical current dependence confirm superconducting behavior.
    • Shubnikov-de Haas oscillations reveal a topologically non-trivial 2D surface state responsible for ballistic Josephson current.

    Key Insights:

    • Demonstrated unambiguous Josephson supercurrents mediated by a topological surface state.
    • Established a material platform (Nb-Bi(2)Te(3)-Nb) for exploring topological superconductivity.
    • Overcame challenges posed by diffusive bulk conductivity in topological insulators.

    Outlook:

    • These junctions serve as a promising platform for realizing Majorana fermions.
    • The findings pave the way for novel quantum devices and topological quantum computing.
    • Further research can explore manipulating these topological surface states for advanced applications.