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Coulomb blockade in an atomically thin quantum dot coupled to a tunable Fermi reservoir
Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland..ORCID iD: 0000-0001-7254-8292
KTH, School of Engineering Sciences (SCI), Applied Physics.
Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.;Indian Inst Technol, Goa GEC Campus, Ponda, Goa, India..
Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland..
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2019 (English)In: Nature Nanotechnology, ISSN 1748-3387, E-ISSN 1748-3395, Vol. 14, no 5, p. 442-446Article in journal (Refereed) Published
Abstract [en]

Gate-tunable quantum-mechanical tunnelling of particles between a quantum confined state and a nearby Fermi reservoir of delocalized states has underpinned many advances in spintronics and solid-state quantum optics. The prototypical example is a semiconductor quantum dot separated from a gated contact by a tunnel barrier. This enables Coulomb blockade, the phenomenon whereby electrons or holes can be loaded one-by-one into a quantum dot(1,2). Depending on the tunnel-coupling strength(3,4), this capability facilitates single spin quantum bits(1,2,5) or coherent many-body interactions between the confined spin and the Fermi reservoirs(6,7). Van der Waals (vdW) heterostructures, in which a wide range of unique atomic layers can easily be combined, offer novel prospects to engineer coherent quantum confined spins(8,9), tunnel barriers down to the atomic limit(10) or a Fermi reservoir beyond the conventional flat density of states(11). However, gate-control of vdW nanostructuresu(12-16) at the single particle level is needed to unlock their potential. Here we report Coulomb blockade in a vdW heterostructure consisting of a transition metal dichalcogenide quantum dot coupled to a graphene contact through an atomically thin hexagonal boron nitride (hBN) tunnel barrier. Thanks to a tunable Fermi reservoir, we can deterministically load either a single electron or a single hole into the quantum dot. We observe hybrid excitons, composed of localized quantum dot states and delocalized continuum states, arising from ultra-strong spin-conserving tunnel coupling through the atomically thin tunnel barrier. Probing the charged excitons in applied magnetic fields, we observe large gyromagnetic ratios (similar to 8). Our results establish a foundation for engineering next-generation devices to investigate either novel regimes of Kondo physics or isolated quantum bits in a vdW heterostructure platform.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2019. Vol. 14, no 5, p. 442-446
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Nano Technology
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URN: urn:nbn:se:kth:diva-252393DOI: 10.1038/s41565-019-0402-5ISI: 000467053100020PubMedID: 30858522Scopus ID: 2-s2.0-85062868278OAI: oai:DiVA.org:kth-252393DiVA, id: diva2:1337806
Note

QC 20190717

Available from: 2019-07-17 Created: 2019-07-17 Last updated: 2019-07-17Bibliographically approved

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Branny, Artur

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