Confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures

Alejandro R.P. Montblanch, Dhiren M. Kara, Ioannis Paradisanos, Carola M. Purser, Matthew S.G. Feuer, Evgeny M. Alexeev, Lucio Stefan, Ying Qin, Mark Blei, Gang Wang, Alisson R. Cadore, Pawel Latawiec, Marko Lončar, Sefaattin Tongay, Andrea C. Ferrari, Mete Atatüre

Research output: Contribution to journalArticlepeer-review

Abstract

Interlayer excitons in layered materials constitute a novel platform to study many-body phenomena arising from long-range interactions between quantum particles. Long-lived excitons are required to achieve high particle densities, to mediate thermalisation, and to allow for spatially and temporally correlated phases. Additionally, the ability to confine them in periodic arrays is key to building a solid-state analogue to atoms in optical lattices. Here, we demonstrate interlayer excitons with lifetime approaching 0.2 ms in a layered-material heterostructure made from WS2 and WSe2 monolayers. We show that interlayer excitons can be localised in an array using a nano-patterned substrate. These confined excitons exhibit microsecond-lifetime, enhanced emission rate, and optical selection rules inherited from the host material. The combination of a permanent dipole, deterministic spatial confinement and long lifetime places interlayer excitons in a regime that satisfies one of the requirements for simulating quantum Ising models in optically resolvable lattices.

Original languageEnglish (US)
Article number119
JournalCommunications Physics
Volume4
Issue number1
DOIs
StatePublished - Dec 2021
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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