Valley-Hybridized Gate-Tunable 1D Exciton Confinement in MoSe 2

Controlling excitons at the nanoscale in semiconductor materials represents a formidable challenge in the quantum photonics and optoelectronics fields. Monolayers of transition metal dichalcogenides (TMDs) offer inherent 2D confinement and possess significant exciton binding energies, making them pr...

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Bibliographic Details
Published inACS nano Vol. 18; no. 44; pp. 30283 - 30292
Main Authors Heithoff, Maximilian, Moreno, Álvaro, Torre, Iacopo, Feuer, Matthew S G, Purser, Carola M, Andolina, Gian Marcello, Calajò, Giuseppe, Watanabe, Kenji, Taniguchi, Takashi, Kara, Dhiren M, Hays, Patrick, Tongay, Seth Ariel, Fal'ko, Vladimir I, Chang, Darrick, Atatüre, Mete, Reserbat-Plantey, Antoine, Koppens, Frank H L
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 21.10.2024
Subjects
Physics
1D excitons
van der Waals heterostructures
2D semiconductors
quantum photonics
transition metal dichalcogenides
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Summary:Controlling excitons at the nanoscale in semiconductor materials represents a formidable challenge in the quantum photonics and optoelectronics fields. Monolayers of transition metal dichalcogenides (TMDs) offer inherent 2D confinement and possess significant exciton binding energies, making them promising candidates for achieving electric-field-based confinement of excitons without dissociation. Exploiting the valley degree of freedom associated with these confined states further broadens the prospects for exciton engineering. Here, we show electric control of light polarization emitted from one-dimensional (1D) quantum-confined states in MoSe . Building on previous reports of tunable trapping potentials and linearly polarized emission, we extend this understanding by demonstrating how nonuniform in-plane electric fields enable in situ control of these effects and highlight the role of gate-tunable valley hybridization in these localized states. Their polarization is entirely engineered through either the 1D confinement potential's geometry or an out-of-plane magnetic field. Controlling nonuniform in-plane electric fields in TMDs enables control of the energy (up to five times its line width), polarization state (from circular to linear), and position of 1D confined excitonic states (5 nm V ).
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.4c04786