Experimental supercurrent and corresponding quantum dot modeling

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Fig. 3 Experimental supercurrent and corresponding quantum dot modeling. Experimental supercurrent and corresponding quantum dot modeling. (A to D) Measured VG3 dependence of the switching currents Ir and Is at B = 0 (A) and of the fitted critical current jc at different B, hence EZ/U (data from device 1). The normal-state G measured at 4.2 K and B = 0 is overlaid in (A). (E to H) NRG calculations of jc(δ/U, Γ/U) for values of Ez/U corresponding to the left panels. Each phase diagram has a closed region corresponding to a spin-1/2 ground state, surrounded by an open region where the ground state is a singlet. Crossing the boundary between these regions at constant superconducting phase difference results in a reversal of the supercurrent. To underline this effect, in the spin-1/2 region, we conventionally give a negative sign to jc. The white lines represent the Γ(δ, EZ) dependence obtained from the normal-state fit parameters. a.u., arbitrary units. J. C. Estrada Saldaña et al. Sci Adv 2019;5:eaav1235 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).