Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure.
Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure.
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DOI：
10.1126/sciadv.abj3176
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发表时间：
2021-10-22
期刊：
影响因子：
13.6
通讯作者：
Park HG
中科院分区：
文献类型：
--
作者：
So JP;Kim HR;Baek H;Jeong KY;Lee HC;Huh W;Kim YS;Watanabe K;Taniguchi T;Kim J;Lee CH;Park HG
通过电泵浦在锯齿状范德华异质结构中演示了确定性单光子发射器。过渡金属二硫属化物 (TMDC) 中的量子限制能够实现确定性单光子发射器。单光子的位置和偏振控制已经通过使用纳米结构的局部应变工程实现。然而，大多数现有的基于 TMDC 的发射器都是通过光泵浦操作的，而电泵浦发射器中的发射位置不受控制。在这里，我们展示了电驱动的单光子发射器，位于由石墨烯、六方氮化硼和二硒化钨组成的范德华异质结构上原子力显微镜压痕诱发应变的位置。系统地分析了局部应变梯度引起的光学、电学和机械性能。压痕位点处的发射表现出光子反聚束行为，g(2)(0) 值约为 0.3、强度饱和和线性交叉偏振双峰（4 开尔文）。这种对电驱动单光子发射器的强大空间控制将为集成量子光源的实际实现铺平道路。
Deterministic single-photon emitters were demonstrated in an indented van der Waals heterostructure by electrical pumping. Quantum confinement in transition metal dichalcogenides (TMDCs) enables the realization of deterministic single-photon emitters. The position and polarization control of single photons have been achieved via local strain engineering using nanostructures. However, most existing TMDC-based emitters are operated by optical pumping, while the emission sites in electrically pumped emitters are uncontrolled. Here, we demonstrate electrically driven single-photon emitters located at the positions where strains are induced by atomic force microscope indentation on a van der Waals heterostructure consisting of graphene, hexagonal boron nitride, and tungsten diselenide. The optical, electrical, and mechanical properties induced by the local strain gradient were systematically analyzed. The emission at the indentation sites exhibits photon antibunching behavior with a g(2)(0) value of ~0.3, intensity saturation, and a linearly cross-polarized doublet, at 4 kelvin. This robust spatial control of electrically driven single-photon emitters will pave the way for the practical implementation of integrated quantum light sources.
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