论文标题
在ws $ _2 $/WSE $ _2 $异质结构中限制长寿命中间层中的激子
Confinement of long-lived interlayer excitons in WS$_2$/WSe$_2$ heterostructures
论文作者
论文摘要
分层材料中的层间激子构成了一个新的平台，用于研究由量子颗粒之间的长期相互作用引起的多体现象。在势能陷阱中将单个层间激子定位的能力是模拟人工晶格中哈伯德物理的关键步骤。在这里，我们使用ws $ _ {2} $/WSE $ _ {2} $杂质结构在纳米图案的基板上，在强限制陷阱阵列中的长寿命中层中激素的空间定位。我们检测到寿命寿命的长期层间激子接近0.2 ms，并表明它们的限制会导致寿命降低在微秒范围内，并且具有持续的光学选择规则的发射率更强。永久性偶极力矩，空间限制和长寿命的结合在一个方案中，可以满足观察可在可光上可解析的陷阱晶格中远程动力学的要求之一。
Interlayer excitons in layered materials constitute a novel platform to study many-body phenomena arising from long-range interactions between quantum particles. The ability to localise individual interlayer excitons in potential energy traps is a key step towards simulating Hubbard physics in artificial lattices. Here, we demonstrate spatial localisation of long-lived interlayer excitons in a strongly confining trap array using a WS$_{2}$/WSe$_{2}$ heterostructure on a nanopatterned substrate. We detect long-lived interlayer excitons with lifetime approaching 0.2 ms and show that their confinement results in a reduced lifetime in the microsecond range and stronger emission rate with sustained optical selection rules. The combination of a permanent dipole moment, spatial confinement and long lifetime places interlayer excitons in a regime that satisfies one of the requirements for observing long-range dynamics in an optically resolvable trap lattice.
