Confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures
Confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures
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DOI：
10.1038/s42005-021-00625-0
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发表时间：
2021-06-07
影响因子：
5.5
通讯作者：
Atature, Mete
中科院分区：
文献类型：
--
作者：
Montblanch, Alejandro R-P;Kara, Dhiren M.;Atature, Mete
层状材料中的层间激子是研究量子粒子间长程相互作用所引起的多体现象的一个新平台。长寿命的激子需要实现高粒子密度，介导热化，并允许空间和时间相关的阶段。此外，将它们限制在周期性阵列中的能力是在光学晶格中构建原子的固态模拟的关键。在这里，我们展示了层间激子的寿命接近0.2毫秒的层状材料的异质结构由WS 2和WSe 2单层。我们表明，层间激子可以定位在一个阵列中使用纳米图案化的基板。这些受限激子表现出微秒寿命，增强的发射速率，和光学选择规则继承的主机材料。层间激子具有永久偶极子、确定性空间约束和长寿命的特性，满足在光学可分辨晶格中模拟量子伊辛模型的要求之一。激子是由电子-空穴对组成的准粒子，可以用来研究多体现象。在这里，作者展示了沉积在纳米图案化衬底上的WS 2/WSe 2异质结构中长寿命层间激子的按需量子限制。
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.Excitons are quasiparticles consisting of an electron-hole pair and can be used to study many-body phenomenon. Here, the authors demonstrate on-demand quantum confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures deposited on nanopatterned substrates.