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Coulomb blockade in...
Coulomb blockade in an atomically thin quantum dot coupled to a tunable Fermi reservoir
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- Brotons-Gisbert, Mauro (författare)
- Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.
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- Branny, Artur (författare)
- KTH,Tillämpad fysik
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- Kumar, Santosh (författare)
- Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.;Indian Inst Technol, Goa GEC Campus, Ponda, Goa, India.
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- Picard, Raphael (författare)
- Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.
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- Proux, Raphael (författare)
- Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.
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- Gray, Mason (författare)
- Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA.
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- Burch, Kenneth S. (författare)
- Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA.
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- Watanabe, Kenji (författare)
- Natl Inst Mat Sci, Tsukuba, Ibaraki, Japan.
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- Taniguchi, Takashi (författare)
- Natl Inst Mat Sci, Tsukuba, Ibaraki, Japan.
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- Gerardot, Brian D. (författare)
- Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland.
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Heriot Watt Univ, Inst Photon & Quantum Sci, SUPA, Edinburgh, Midlothian, Scotland Tillämpad fysik (creator_code:org_t)
- 2019-03-11
- 2019
- Engelska.
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Ingår i: Nature Nanotechnology. - : NATURE PUBLISHING GROUP. - 1748-3387 .- 1748-3395. ; 14:5, s. 442-446
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
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Brotons-Gisbert, ...
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Branny, Artur
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Kumar, Santosh
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Picard, Raphael
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Proux, Raphael
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Gray, Mason
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Burch, Kenneth S ...
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Watanabe, Kenji
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Taniguchi, Takas ...
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Gerardot, Brian ...
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