Fig. 6: Competition between the spin–orbit coupling and the impurity potential and their effect on the temperature behavior of the critical current.
From: Coexistence and tuning of spin-singlet and triplet transport in spin-filter Josephson junctions
Normalized critical current Ic vs. temperature T curves simulated with the tight-binding Bogoliubov–De Gennes two-dimensional lattice model as a function of the spin–orbit coupling α and the on-site impurity potential Vimp. In (a) α = 0.2, Vimp = 0.05; (b) α = 0.2, Vimp = 0.23; (c) α = 0.2, Vimp = 0.3; (d) α = 0.2, Vimp = 0.5; (e) α = 0.1, Vimp = 0.05; (f) α = 0.1, Vimp = 0.23; (g) α = 0.1, Vimp = 0.3; (h) α = 0.1, Vimp = 0.5; (i) α = 0.07, Vimp = 0.05; (j) α = 0.07, Vimp = 0.23; (k) α = 0.07, Vimp = 0.3; (l) α = 0.07, Vimp = 0.5; (m) α = 0.04, Vimp = 0.05; (n) α = 0.04, Vimp = 0.23; (o) α = 0.04, Vimp = 0.3; and (p) α = 0.04, Vimp = 0.5. In all the panels, the Ic (y axis) is normalized to its value at the lowest temperature, i. e. T = 300 mK, while the T (x axis) is normalized to the critical temperature of the device Tc. Red-color scale refers to increasing values of α, while blue-color scale refers to increasing Vimp values, with parameters reported in Discussion and in the Supplementary Note 2. The scale on the y axis on each plot ranges from 0 to 1.1, as on the x axis. Minor thicks represent an increment of 0.1. We also highlight in panels (a), (d), (j), and (p) the state of the Josephson junction: 0, 0–π, or π.
