Fig. 6: Energies of the YSR state as function of scaled coupling. | Communications Physics

Fig. 6: Energies of the YSR state as function of scaled coupling.

From: Quantum phase transitions and the role of impurity-substrate hybridization in Yu-Shiba-Rusinov states

Fig. 6

For small coupling Γs < EJ (Γs is impurity-substrate coupling and EJ is the level splitting) scattering is weak and the YSR peaks move towards zero for increasing coupling. At zero energy, where Γs = EJ, the system undergoes a quantum phase transition into the strong scattering regime. In the strong coupling regime, where Γs > EJ, the YSR energies move away from zero as the coupling increases. The range of coupling values in the different data sets are indicated as black wedges with the thinner end indicating a smaller tip-sample distance.

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