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Hybrid superconductor-semiconducting nanowire devices provide an idealplatform to investigating novel intragap bound states, such as the Andreevbound states (ABSs), Yu-Shiba-Rusinov (YSR) states, and the Majorana boundstates. The competition between Kondo correlations and superconductivity inJosephson quantum dot (QD) devices results in two different ground states andthe occurrence of a 0-$\pi$ quantum phase transition. Here we report ontransport measurements on hybrid superconductor-InSb nanowire QD devices withdifferent device geometries. We demonstrate a realization of continuousgate-tunable ABSs with both 0-type levels and $\pi$-type levels. This allow usto manipulate the transition between 0 and $\pi$ junction and explore chargetransport and spectrum in the vicinity of the quantum phase transition regime.Furthermore, we find a coexistence of 0-type ABS and $\pi$-type ABS in the samecharge state. By measuring temperature and magnetic field evolution of theABSs, the different natures of the two sets of ABSs are verified, beingconsistent with the scenario of phase transition between the singlet anddoublet ground state. Our study provides insights into Andreev transportproperties of hybrid superconductor-QD devices and sheds light on the crossoverbehavior of the subgap spectrum in the vicinity of 0-$\pi$ transition.

Study of 0-$\pi$ phase transition in hybrid superconductor-InSb nanowire quantum dot devices