Realization of a minimal Kitaev chain in coupled quantum dots

Tom Dvir (Corresponding author), Guanzhong Wang, Nick van Loo, Chun Xiao Liu, Grzegorz P. Mazur, Alberto Bordin, Sebastiaan L.D. ten Haaf, Ji Yin Wang, David van Driel, Francesco Zatelli, Xiang Li, Filip K. Malinowski, Sasa Gazibegovic, Ghada Badawy, Erik P.A.M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

53 Citaten (Scopus)
29 Downloads (Pure)

Samenvatting

Majorana bound states constitute one of the simplest examples of emergent non-Abelian excitations in condensed matter physics. A toy model proposed by Kitaev shows that such states can arise at the ends of a spinless p-wave superconducting chain1. Practical proposals for its realization2,3 require coupling neighbouring quantum dots (QDs) in a chain through both electron tunnelling and crossed Andreev reflection4. Although both processes have been observed in semiconducting nanowires and carbon nanotubes5–8, crossed-Andreev interaction was neither easily tunable nor strong enough to induce coherent hybridization of dot states. Here we demonstrate the simultaneous presence of all necessary ingredients for an artificial Kitaev chain: two spin-polarized QDs in an InSb nanowire strongly coupled by both elastic co-tunnelling (ECT) and crossed Andreev reflection (CAR). We fine-tune this system to a sweet spot where a pair of poor man’s Majorana states is predicted to appear. At this sweet spot, the transport characteristics satisfy the theoretical predictions for such a system, including pairwise correlation, zero charge and stability against local perturbations. Although the simple system presented here can be scaled to simulate a full Kitaev chain with an emergent topological order, it can also be used imminently to explore relevant physics related to non-Abelian anyons.

Originele taal-2Engels
Pagina's (van-tot)445-450
Aantal pagina's6
TijdschriftNature
Volume614
DOI's
StatusGepubliceerd - 16 feb. 2023

Financiering

This work has been supported by the Dutch Organisation for Scientific Research (NWO), a subsidy for Top Consortia for Knowledge and Innovation (TKl toeslag), Microsoft Corporation Station Q and support from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 828948, project AndQC. We thank G. de Lange, S. Goswami, D. Xu, D. Loss and J. Klinovaja for helpful discussions.

FinanciersFinanciernummer
Microsoft Corporation Station‐Q
European Union’s Horizon Europe research and innovation programme828948
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

    Vingerafdruk

    Duik in de onderzoeksthema's van 'Realization of a minimal Kitaev chain in coupled quantum dots'. Samen vormen ze een unieke vingerafdruk.

    Citeer dit