Temperature Induced Shifts of Yu-Shiba-Rusinov Resonances in Nanowire-Based Hybrid Quantum Dots

Abstract

The strong coupling of a superconductor to a spinful quantum dot results in Yu-Shiba-Rusinov (YSR) discrete subgap excitations. In isolation and at zero temperature, the excitations are $\delta$ resonances. In transport experiments, however, they show as broad differential conductance peaks. We obtain the lineshape of the peaks and their temperature dependence in superconductor-quantum-dot-metal (S-QD-N) 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 scaling of the peak area versus temperature. These observations are not explained by current models.

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Cited by in corpus (9)

• Excitations in a superconducting Coulombic energy gap
• Dynamical quantum phase transitions in a mesoscopic superconducting system
• From Cooper pair splitting to the non-local spectroscopy of a Shiba state
• Josephson junctions in double nanowires bridged by in-situ deposited superconductors
• Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule
• Electron-boson-interaction induced particle-hole symmetry breaking of conductance into subgap states in superconductors
• Unified theory of quantum phase transitions in quantum dots with gapped host bands
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot