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Observation of Quadrupolar and Dipolar Excitons in a Semiconductor Heterotrilayer by Leo Yu & Kateryna Pistunova & Jenny Hu & Kenji Watanabe & Takashi Taniguchi & Tony F. Heinz is a Materials Science article available to read on EtoBox.
What is Observation of Quadrupolar and Dipolar Excitons in a Semiconductor Heterotrilayer about?
Van der Waals (vdW) materials have opened up many avenues for discovery through layer assembly, as epitomized by interlayer dipolar excitons that exhibit electrically tunable luminescence, lasing and exciton condensation. Extending interlayer excitons to more vdW layers, however, raises fundamental questions concerning coherence within excitons and coupling between moiré superlattices at multiple interfaces. Here, by assembling angle-aligned WSe 2 /WS 2 /WSe 2 heterotrilayers, we demonstrate the emergence of quadrupolar excitons. We confirm the exciton's quadrupolar nature by the decrease in its energy of 12 meV from coherent hole tunnelling between the two outer layers, its tunable static dipole moment under an external electric field and the reduced exciton-exciton interactions. At high exciton density, we also see signatures of a phase of oppositely aligned dipolar excitons, consistent with a staggered dipolar phase predicted to be driven by attractive dipolar interactions. Our demonstration paves the way for discovering emergent exciton orderings for three vdW layers and beyond.
Who reads Observation of Quadrupolar and Dipolar Excitons in a Semiconductor Heterotrilayer?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Leo Yu & Kateryna Pistunova & Jenny Hu & Kenji Watanabe & Takashi Taniguchi & Tony F. Heinz
- Publisher
- Springer Science and Business Media LLC
- Published
- 2023
- Language
- EN
- Field
- Materials Science (Physical Sciences)