In grounded superconducting multiterminal devices, thermal background charge noise can encode heat-conductance information, and thermal shot noise contains Andreev-specific interference terms.
Local thermometry of NbSe$_2$ flake with delta-$T$ noise measurements
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abstract
We perform transport and noise measurements for device consisting of a thin NbSe$_2$ flake laid onto the predefined gold electrodes and covered with a thin hBN flake. In the shot noise of a NbSe$_2$/Au tunnel junction (TJ), we identify Andreev reflection regime by demonstrating the effective charge doubling. Further, by creating temperature gradient across the TJ and measuring its delta-$T$ noise in the normal state, we extract electron-phonon scattering length in NbSe$_2$ 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.
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$\Delta T$-noise in Multiterminal Hybrid Systems
In grounded superconducting multiterminal devices, thermal background charge noise can encode heat-conductance information, and thermal shot noise contains Andreev-specific interference terms.