Robustness of Yu-Shiba-Rusinov resonances in presence of a complex superconducting order parameter
arXiv:1803.08726 · doi:10.1103/PhysRevB.100.014502
Abstract
Robust quantum systems rely on having a protective environment with minimized relaxation channels. Superconducting gaps play an important role in the design of such environments. The interaction of localized single spins with a conventional superconductor generally leads to intrinsically extremely narrow Yu-Shiba-Rusinov (YSR) resonances protected inside the superconducting gap. However, this may not apply to superconductors with nontrivial, energy dependent order parameters. Exploiting the Fe-doped two-band superconductor NbSe, we show that due to the nontrivial relation between its complex valued and energy dependent order parameters, YSR states are no longer restricted to be inside the gap. They can appear outside the gap (i. e. inside the coherence peaks), where they can also acquire a substantial intrinsic lifetime broadening. T-matrix scattering calculations show excellent agreement with the experimental data and relate the intrinsic YSR state broadening to the imaginary part of the host's order parameters. Our results suggest that non-thermal relaxation mechanisms contribute to the finite lifetime of the YSR states, even within the superconducting gap, making them less protected against residual interactions than previously assumed. YSR states may serve as valuable probes for nontrivial order parameters promoting a judicious selection of protective superconductors.
arXiv comment11 pages, 8 figures, including supporting information
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Cited by in corpus (18)
- Observation of Coexistence of Yu-Shiba-Rusinov States and Spin-Flip Excitations
- Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
- Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on a superconductor
- Tunneling dynamics between superconducting bound states at the atomic limit
- Yu-Shiba-Rusinov states in real metals
- Interplay Between Yu-Shiba-Rusinov States and Multiple Andreev Reflections
- Coherent and incoherent tunneling into YSR states revealed by atomic scale shot-noise spectroscopy
- Tunneling processes between Yu-Shiba-Rusinov bound states
- Yu-Shiba-Rusinov states in 2D superconductors with arbitrary Fermi contours
- Full Counting Statistics of Yu-Shiba-Rusinov Bound States
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- Shiba states in systems with density of states singularities
- Non-perturbative insights into the spectral properties of QCD at finite temperature
- Magnetic impurities on superconducting Pb surfaces
- Visualization of defect-induced interband proximity effect at the nanoscale
- In-gap states of magnetic impurity in quantum spin Hall insulator proximitized to a superconductor
- Yu-Shiba-Rusinov bound states boost odd-frequency superconductivity
- Spin-dependent tunneling between individual superconducting bound states