Epitaxial Pb on InAs nanowires for quantum devices

@article{Kanne2020EpitaxialPO,
  title={Epitaxial Pb on InAs nanowires for quantum devices},
  author={Thomas Kanne and Mikelis Marnauza and Dags Olsteins and Damon James Carrad and Joachim E. Sestoft and Joeri de Bruijckere and Lunjie Zeng and Erik Johnson and Eva Olsson and Kasper Grove‐Rasmussen and Jesper Nyg{\aa}rd},
  journal={Nature Nanotechnology},
  year={2020},
  volume={16},
  pages={776 - 781}
}
Semiconductor–superconductor hybrids are widely used to realize complex quantum phenomena, such as topological superconductivity and spins coupled to Cooper pairs. Accessing new, exotic regimes at high magnetic fields and increasing operating temperatures beyond the state-of-the-art requires new, epitaxially matched semiconductor–superconductor materials. One challenge is the generation of favourable conditions for heterostructural formation between materials with the desired properties. Here… 

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References

SHOWING 1-10 OF 50 REFERENCES

Hard gap in epitaxial semiconductor-superconductor nanowires.

The hard gap induced by the proximity effect in a semiconductor, using epitaxial InAs-Al semiconductor-superconductor nanowires, makes this new hybrid system attractive for a number of applications, as well as fundamental studies of mesoscopic superconductivity.

Epitaxy of advanced nanowire quantum devices

A technique for generic bottom-up synthesis of complex quantum devices with a special focus on nanowire networks with a predefined number of superconducting islands is demonstrated, opening up new avenues for the realization of epitaxial three-dimensional quantum architectures which have the potential to become key components of various quantum devices.

Epitaxy of semiconductor-superconductor nanowires.

The grain growth kinetics of the metal phase is formulated in general terms of continuum parameters and bicrystal symmetries and seems to solve the soft-gap problem in superconducting hybrid structures.

Quantized conductance doubling and hard gap in a two-dimensional semiconductor–superconductor heterostructure

The hard-gap semiconductor–superconductor system demonstrated here is amenable to top-down processing and provides a new avenue towards low-dissipation electronics and topological quantum systems.

Shadow Epitaxy for In Situ Growth of Generic Semiconductor/Superconductor Hybrids

This work introduces a crystal growth platform-based on 3D structuring of growth substrates-which enables synthesis of semiconductor nanowire hybrids with in situ patterned superconductor shells, thereby enabling full freedom in the choice of hybrid constituents.

Two-dimensional epitaxial superconductor-semiconductor heterostructures: A platform for topological superconducting networks

Progress in the emergent field of topological superconductivity relies on synthesis of new material combinations, combining superconductivity, low density, and spin-orbit coupling (SOC). For example,

Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device

We report on the observation of excitation of Majorana fermions in a Nb-InSb nanowire quantum dot-Nb hybrid system. The InSb nanowire quantum dot is formed between the two Nb contacts by weak

From Andreev to Majorana bound states in hybrid superconductor–semiconductor nanowires

Inhomogeneous superconductors can host electronic excitations, known as Andreev bound states (ABSs), below the superconducting energy gap. With the advent of topological superconductivity, a new kind

Andreev molecules in semiconductor nanowire double quantum dots

The authors demonstrate the coupling of electronic states in a double quantum dot to form Andreev molecule states; a potential building block for longer chains suitable for quantum simulation.

Metallization of Rashba wire by superconducting layer in the strong-proximity regime

Semiconducting quantum wires defined within two-dimensional electron gases and strongly coupled to thin superconducting layers have been extensively explored in recent experiments as promising