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Accueil du site > LPCNO > Séminaires > 2018 > Charge tunable quantum dots in monolayer WSe2

Charge tunable quantum dots in monolayer WSe2

Date : 17/05/2017 à 14:00

Titre : Charge tunable quantum dots in monolayer WSe2

Intervenant : Brian Gerardot

Provenance : Heriot-Watt-University, Edinburgh, Grande Bretagne.

Salle : Salle de séminaire - LPCNO

Abstract : Gate-tunable tunnel coupling between a semiconductor quantum dot and a nearby Fermi sea has underpinned many advances in quantum spintronics and solid-state quantum optics. Due to Coulomb blockade, such devices enable direct control over the quantum dot charge state (loading electrons or holes one at a time). In this talk, I will present single quantum dots in an atomically thin semiconductor that exhibit Coulomb blockade. This is achieved by embedding monolayer WSe2 in a heterostructure device with a gate-tunable tunnel interaction between the quantum dots and a nearby Fermi sea in few-layer graphene. Magneto-optical spectroscopy of the positively charged, neutral, and negatively charged excitons reveals the nature of the WSe2 quantum emitters. Further, due to a strong tunnel interaction between the quantum dots and Fermi sea, we observe distinct Kondo-like many-body interactions between the localized states and the continuum of electron or hole states. Next generation heterostructure devices offer the potential to further investigate and engineer either isolated single spins or strongly coupled many-body states in a two-dimensional platform.