Fig. 3: The charge stability diagram and the coupling processes.
From: Enhancing the excitation gap of a quantum-dot-based Kitaev chain
a Schematic description of the charge stability diagram. Γe (red arrows) and Γo (blue arrows) couples even and odd states, respectively. b Charge stability diagram with tso = 0 and εA = − 1.5Δ0. In this case, only spin-conserving processes are allowed, resulting in a ring-like pattern in the charge stability diagram. Charge stability diagrams for different values of εA. In particular, for orbital energies εDL ≈ εDR ≈ 0, in c Γo dominates with \({\varepsilon }_{A}={\varepsilon }_{A}^{* }-0.2{\Delta }_{0}\), in d it shows the sweet spot \({\varepsilon }_{A}={\varepsilon }_{A}^{* }\), and in e Γe dominates \({\varepsilon }_{A}={\varepsilon }_{A}^{* }+0.2{\Delta }_{0}\). Here \({\varepsilon }_{A}^{* }\approx -0.269{\Delta }_{0}\) is the sweet spot value. In panels b–e, we use t = Δ0. Panels b–e share the same colorbar.
