|Title||0-pi phase transition in hybrid superconductor-InSb nanowire quantum dot devices|
Xu, H. Q.
|Affiliation||Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China.|
Peking Univ, Dept Elect, Beijing 100871, Peoples R China.
IEMN, UMR CNRS 8520, Ave Poincare,BP 60069, F-60069 Villeneuve Dascq, France.
Lund Univ, Div Solid State Phys, Box 118, S-22100 Lund, Sweden.
Australian Natl Univ, Res Sch Phys & Engn, Dept Elect Mat Engn, Canberra, ACT 0200, Australia.
Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China.
Xu, HQ (reprint author), Peking Univ, Dept Elect, Beijing 100871, Peoples R China.
Xu, HQ (reprint author), Lund Univ, Div Solid State Phys, Box 118, S-22100 Lund, Sweden.
|Keywords||BIAS CONDUCTANCE PEAK|
|Publisher||PHYSICAL REVIEW B|
|Citation||PHYSICAL REVIEW B.2017,95(1).|
|Abstract||Hybrid superconductor-semiconducting nanowire devices provide an ideal platform to investigating interesting intragap bound states, such as the Andreev bound states (ABSs), Yu-Shiba-Rusinov (YSR) states, and the Majorana bound states. The competition betweenKondo correlations and superconductivity in Josephson quantum dot (QD) devices results in two different ground states and the occurrence of a 0-pi quantum phase transition. Here we report on transport measurements on hybrid superconductor-InSb nanowire QD devices with different device geometries. We demonstrate a realization of continuous gate-tunable ABSs with both 0-type levels and pi-type levels. This allow us to manipulate the transition between the 0 and pi junction and explore charge transport 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 same charge state. By measuring temperature and magnetic field evolution of the ABSs, the different natures of the two sets of ABSs are verified, being consistent with the scenario of phase transition between the singlet and doublet ground state. Our study provides insight into Andreev transport properties of hybrid superconductor-QD devices and sheds light on the crossover behavior of the subgap spectrum in the vicinity of the 0-pi transition.|
|Appears in Collections:||纳米器件物理与化学教育部重点实验室|