Extended Data Fig. 2: MSS energy versus localized level energy Er and coupling strength Γ to the superconducting host.
From: Proximity superconductivity in atom-by-atom crafted quantum dots
a, Energy of the lowest-energy excitation of the Hamiltonian in equation (1). For all Γ ≠ 0, an in-gap solution with ε+/Δs < 1 is found. b–d, Energy-dependent local electron density of states LDOS(E) of a spin-degenerate localized level at energy Er/Δs = 0.0 (panel b), Er/Δs = 0.5 (panel c) and Er/Δs = 2.0 (panel d) coupled to a superconducting bath with the order parameter Δs by a coupling strength Γ ∝ V2 (see Methods). An energetic broadening of δE = 0.03Δs has been added in all panels (see Methods).
