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Montblanch, Alejandro R.-P.; Kara, Dhiren M.; Paradisanos, Ioannis; Purser, Carola M.; Feuer, Matthew S. G.; Alexeev, Evgeny M.; Stefan, Lucio; Qin, Ying; Blei, Mark; Wang, Gang; Cadore, Alisson R.; Latawiec, Pawel; Lončar, Marko; Tongay, Sefaattin; Ferrari, Andrea C.; Atatüre, Mete
Communications physics, 06/2021, Letnik: 4, Številka: 1Journal Article
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 WS 2 and WSe 2 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.
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