Normal, superconducting and topological regimes of hybrid double quantum dots

Daniel Sherman; J.S. Yodh; Sven Marian Albrecht; Jesper Nygård; Peter Krogstrup; Charles M. Marcus

doi:10.1038/nnano.2016.227

Normal, superconducting and topological regimes of hybrid double quantum dots

Daniel Sherman, J.S. Yodh, Sven Marian Albrecht, Jesper Nygård, Peter Krogstrup, Charles M. Marcus

Faststoffysik

32 Citationer (Scopus)

Abstract

Epitaxial semiconductor-superconductor hybrid materials are an excellent basis for studying mesoscopic and topological superconductivity, as the semiconductor inherits a hard superconducting gap while retaining tunable carrier density. Here, we investigate double-quantum-dot structures made from InAs nanowires with a patterned epitaxial Al two-facet shell that proximitizes two gate-defined segments along the nanowire. We follow the evolution of mesoscopic superconductivity and charging energy in this system as a function of magnetic field and voltage-tuned barriers. Interdot coupling is varied from strong to weak using side gates, and the ground state is varied between normal, superconducting and topological regimes by applying a magnetic field. We identify the topological transition by tracking the spacing between successive co-tunnelling peaks as a function of axial magnetic field and show that the individual dots host weakly hybridized Majorana modes.

Originalsprog	Engelsk
Tidsskrift	Nature Nanotechnology
Vol/bind	12
Sider (fra-til)	212-217
ISSN	1748-3387
DOI	https://doi.org/10.1038/nnano.2016.227
Status	Udgivet - 7 mar. 2017

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10.1038/nnano.2016.227

nnano.2016.227(2)Forlagets udgivne version, 4,19 MB

http://arxiv.org/pdf/1605.01865Licens: Andet

Citationsformater

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Normal, superconducting and topological regimes of hybrid double quantum dots

Abstract

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