title: Electrical Control of near-Field Energy Transfer between Quantum Dots and Two-Dimensional Semiconductors.
abstract: We investigate near-field energy transfer between chemically synthesized quantum dots (QDs) and two-dimensional semiconductors. We fabricate devices in which electrostatically gated semiconducting monolayer molybdenum disulfide (MoS2) is placed atop a homogeneous self-assembled layer of core-shell CdSSe QDs. We demonstrate efficient nonradiative Förster resonant energy transfer (FRET) from QDs into MoS2 and prove that modest gate-induced variation in the excitonic absorption of MoS2 leads to large (∼500%) changes in the FRET rate. This in turn allows for up to ∼75% electrical modulation of QD photoluminescence intensity. The hybrid QD/MoS2 devices operate within a small voltage range, allow for continuous modification of the QD photoluminescence intensity, and can be used for selective tuning of QDs emitting in the visible-IR range.
authors.forename: Dhiraj
authors.initials: D
authors.lastname: Prasai
authors.forename: Andrey R
authors.initials: AR
authors.lastname: Klots
authors.affiliation: §Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132, United States.
authors.forename: A K M
authors.initials: AK
authors.lastname: Newaz
authors.forename: J Scott
authors.initials: JS
authors.lastname: Niezgoda
authors.forename: Noah J
authors.initials: NJ
authors.lastname: Orfield
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Escobar
authors.forename: Alex
authors.initials: A
authors.lastname: Wynn
authors.affiliation: #Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, United States.
authors.forename: Anatoly
authors.initials: A
authors.lastname: Efimov
authors.forename: G Kane
authors.initials: GK
authors.lastname: Jennings
authors.affiliation: ∇Vanderbilt Institute for Nanoscale Science and Engineering, Nashville, Tennessee 37235, United States.|○Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.
authors.forename: Sandra J
authors.initials: SJ
authors.lastname: Rosenthal
authors.forename: Kirill I
authors.initials: KI
authors.lastname: Bolotin
keywords: FRET; MoS2; Quantum dots; TMDCs; electrical modulation