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A shot noise probe to detect pairing in quantum materials

ORAL

Abstract

Shot noise is a powerful tool for determining the effective charge in mesoscopic systems, including superconductors and fractional quantum Hall systems. In a superconductor-insulator-superconductor tunnel junction, Andreev reflection leads to an effective charge of multiple electron charges. I will present a newly developed, low temperature (1.5 K), wide bandwidth (100 kHz-5 MHz) noise-measurement amplifier with a resolution down to 0.002 nV2/Hz. I will show measured shot noise in Nb/Al-AlOx/Nb and NbN/oxide/Ag tunnel junctions, and describe possibilities to measure shot noise in conventional and unconventional superconductors.

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Presenters

  • Jiasen Niu

    Leiden University

Authors

  • Jiasen Niu

    Leiden University

  • John Jesudasan

    Tata Institute of Fundamental Research, Mumbai, India, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Tata Institute of Fundamental Research

  • Ruchi Tomar

    Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research

  • Pratap Raychaudhuri

    Tata Institute of Fundamental Research, Mumbai, India, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Tata Institute of Fundamental Research

  • Milan P Allan

    Leiden University