Josephson Effect in a Few-Hole Quantum Dot

Joost Ridderbos, Matthias Brauns, Jie Shen, Folkert K. de Vries, Ang Li, Erik P.A.M. Bakkers, Alexander Brinkman, Floris A. Zwanenburg

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

A Ge–Si core–shell nanowire is used to realize a Josephson field-effect transistor with highly transparent contacts to superconducting leads. By changing the electric field, access to two distinct regimes, not combined before in a single device, is gained: in the accumulation mode the device is highly transparent and the supercurrent is carried by multiple subbands, while near depletion, the supercurrent is carried by single-particle levels of a strongly coupled quantum dot operating in the few-hole regime. These results establish Ge–Si nanowires as an important platform for hybrid superconductor–semiconductor physics and Majorana fermions.

Original languageEnglish
Article number1802257
Pages (from-to)1-6
JournalAdvanced Materials
DOIs
Publication statusPublished - 2018

Keywords

  • silicon quantum electronics
  • superconductor–semiconductor hybrids

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