Template-Assisted Scalable Nanowire Networks

Martin Friedl, Kris Cerveny, Pirmin Weigele, Gozde Tütüncüoglu, Sara Martí-Sánchez, Chunyi Huang, Taras Patlatiuk, Heidi Potts, Zhiyuan Sun, Megan O. Hill, Lucas Güniat, Wonjong Kim, Mahdi Zamani, Vladimir G. Dubrovskii, Jordi Arbiol, Lincoln J. Lauhon, Dominik M. Zumbühl, Anna I. Fontcuberta Morral*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Topological qubits based on Majorana Fermions have the potential to revolutionize the emerging field of quantum computing by making information processing significantly more robust to decoherence. Nanowires are a promising medium for hosting these kinds of qubits, though branched nanowires are needed to perform qubit manipulations. Here we report a gold-free templated growth of III-V nanowires by molecular beam epitaxy using an approach that enables patternable and highly regular branched nanowire arrays on a far greater scale than what has been reported thus far. Our approach relies on the lattice-mismatched growth of InAs on top of defect-free GaAs nanomembranes yielding laterally oriented, low-defect InAs and InGaAs nanowires whose shapes are determined by surface and strain energy minimization. By controlling nanomembrane width and growth time, we demonstrate the formation of compositionally graded nanowires with cross-sections less than 50 nm. Scaling the nanowires below 20 nm leads to the formation of homogeneous InGaAs nanowires, which exhibit phase-coherent, quasi-1D quantum transport as shown by magnetoconductance measurements. These results are an important advance toward scalable topological quantum computing.

Original languageEnglish (US)
Pages (from-to)2666-2671
Number of pages6
JournalNano letters
Volume18
Issue number4
DOIs
StatePublished - Apr 11 2018

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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