Shiba Bound States across the mobility edge in doped InAs nanowires
arXiv:1709.05251 · doi:10.1103/PhysRevLett.119.097701
Abstract
We present a study of Andreev Quantum Dots (QDots) fabricated with small-diameter (30 nm) Si-doped InAs nanowires where the Fermi level can be tuned across a mobility edge separating localized states from delocalized states. The transition to the insulating phase is identified by a drop in the amplitude and width of the excited levels and is found to have remarkable consequences on the spectrum of superconducting SubGap Resonances (SGRs). While at deeply localized levels, only quasiparticles co-tunneling is observed, for slightly delocalized levels, Shiba bound states form and a parity changing quantum phase transition is identified by a crossing of the bound states at zero energy. Finally, in the metallic regime, single Andreev resonances are observed.
9 pages, 4 figures in main text, 3 figures in supplementary
References in corpus (15)
- Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
- Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
- Anderson Transitions
- Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
- Why does wurtzite form in nanowires of III-V zinc-blende semiconductors?
- Supercurrent reversal in quantum dots
- Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
- Transport spectroscopy of a single dopant in a gated silicon nanowire
- Spectral properties of locally correlated electrons in a BCS superconductor
- Critical Current 0- Transition in Designed Josephson Quantum Dot Junctions
- Transport Through Andreev Bound States in a Graphene Quantum Dot
- Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
- Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
- Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
- Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots