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.

超导体与旋转量子点的强耦合会导致Yu–Shiba–Rusinov离散次能隙激发。孤立地且在零温度下，激发是尖锐的共振。但是，在运输实验中，它们显示出宽泛的电导峰。在这里，我们获得了基于超导体-量子点-金属纳米线的器件中峰的线形及其温度依赖性。出乎意料的是，我们发现峰值的能量随温度而移动，其移动幅度和符号取决于基态奇偶校验和偏置电压。此外，我们根据经验找到了峰面积与温度的幂律趋势。当前模型未解释这些观察结果。