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<p>We perform transport and noise measurements for device consisting of a thin NbSe<sub>2</sub> flake laid onto the predefined gold electrodes and covered with a thin hBN flake. In the shot noise of a NbSe<sub>2</sub>/Au tunnel junction, we identify Andreev reflection regime by demonstrating the effective charge doubling. Further, by creating temperature gradient across the tunnel junction and measuring its delta-<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4260_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(T\)</EquationSource> <!--JETPLet2560786Prokudina-m1--> </InlineEquation> noise in the normal state, we extract electron–phonon scattering length in NbSe<sub>2</sub> and its <i>T</i>-dependence. The results of delta-<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4260_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(T\)</EquationSource> <!--JETPLet2560786Prokudina-m2--> </InlineEquation> noise measurements in the absence of a magnetic field when the flake is superconducting are in qualitative agreement with expectations. The introduced approach is promising for the study of nonequilibrium configurations in superconductors.</p>

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Local Thermometry of NbSe2 Flake with Delta-T Noise Measurements

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • M. G. Prokudina,
  • A. F. Shevchun,
  • V. S. Khrapai,
  • E. S. Tikhonov

摘要

We perform transport and noise measurements for device consisting of a thin NbSe2 flake laid onto the predefined gold electrodes and covered with a thin hBN flake. In the shot noise of a NbSe2/Au tunnel junction, we identify Andreev reflection regime by demonstrating the effective charge doubling. Further, by creating temperature gradient across the tunnel junction and measuring its delta- \(T\) noise in the normal state, we extract electron–phonon scattering length in NbSe2 and its T-dependence. The results of delta- \(T\) noise measurements in the absence of a magnetic field when the flake is superconducting are in qualitative agreement with expectations. The introduced approach is promising for the study of nonequilibrium configurations in superconductors.