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Temperature induced shifts of Yu-Shiba-Rusinov resonances in nanowire-based hybrid quantum dots

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The strong coupling of a superconductor to a spinful quantum dot results in Yu-Shiba-Rusinov discrete subgap excitations. In isolation and at zero temperature, the excitations are sharp resonances. In transport experiments, however, they show as broad differential conductance peaks. Here we obtain the lineshape of the peaks and their temperature dependence in superconductor-quantum dot-metal nanowire-based devices. Unexpectedly, we find that the peaks shift in energy with temperature, with the shift magnitude and sign depending on ground state parity and bias voltage. Additionally, we empirically find a power-law trend of the peak area versus temperature. These observations are not explained by current models.

OriginalsprogEngelsk
Artikelnummer125
TidsskriftCommunications Physics
Vol/bind3
Udgave nummer1
Antal sider11
ISSN2399-3650
DOI
StatusUdgivet - 10 jul. 2020

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