Majorana-like Coulomb spectroscopy in the absence of zero bias peaks
arXiv:2203.07829 · doi:10.1038/s41586-022-05382-w
Abstract
Hybrid semiconductor-superconductor devices hold great promise for realizing topological quantum computing with Majorana zero modes (MZMs). However, multiple claims of Majorana detection, based on either tunneling or Coulomb blockade (CB) spectroscopy, remain disputed. Here we devise an experimental protocol that allows to perform both types of measurements on the same hybrid island by adjusting its charging energy via tunable junctions to the normal leads. This method reduces ambiguities of Majorana detections by checking the consistency between CB spectroscopy and zero bias peaks (ZBPs) in non-blockaded transport.Specifically, we observe junction-dependent, even-odd modulated, single-electron CB peaks in InAs/Al hybrid nanowires (NWs) without concomitant low-bias peaks in tunneling spectroscopy. We provide a theoretical interpretation of the experimental observations in terms of low-energy, longitudinally-confined island states rather than overlapping Majorana modes. Our results highlight the importance of combined measurements on the same device for the identification of topological MZMs.
References in corpus (28)
- Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
- Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
- Search for Majorana fermions in superconductors
- Exponential Protection of Zero Modes in Majorana Islands
- Majorana bound states in a coupled quantum-dot hybrid-nanowire system
- Realizing Majorana zero modes in superconductor-semiconductor heterostructures
- Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
- Epitaxy of Semiconductor-Superconductor nanowires
- From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
- Scaling of Majorana Zero-Bias Conductance Peaks
- Majorana bound states from exceptional points in non-topological superconductors
- Parity lifetime of bound states in a proximitized semiconductor nanowire
- Flux-induced topological superconductivity in full-shell nanowires
- Topological superconductivity in full shell proximitized nanowires
- Flux-induced Majorana modes in full-shell nanowires
- Non-Hermitian topology: a unifying framework for the Andreev versus Majorana states controversy
- Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
- Conductance of a proximitized nanowire in the Coulomb blockade regime
- Epitaxial Pb on InAs nanowires
- Shadow epitaxy for in-situ growth of generic semiconductor/superconductor devices
- Electron temperature and tunnel coupling dependence of zero-bias and almost-zero-bias conductance peaks in Majorana nanowires
- Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands
- Coherent transport through a Majorana island in an Aharonov-Bohm interferometer
- In-plane selective area InSb-Al nanowire quantum networks
- Anomalous Metallic Phase in Tunable Destructive Superconductors
- Probing electron-hole components of subgap states in Coulomb blockaded Majorana islands
- Even-odd effect and Majorana states in full-shell nanowires
- Full parity phase diagram of a proximitized nanowire island