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arXiv 2209.15401cond-mat.mes-hall
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基于铁电薄膜与二维过渡金属硫族化合物异质结构的局域激子单电荷控制

Single charge control of localized excitons in heterostructures with ferroelectric thin films and two-dimensional transition metal dichalcogenides

Danjie Dai, Xinyan Wang, Jingnan Yang, Jianchen Dang, Yu Yuan, Bowen Fu, Xin Xie, Longlong Yang, Shan Xiao, Shushu Shi, Sai Yan, Rui Zhu, Zhanchun Zuo, Can Wang… 展开作者

Danjie Dai, Xinyan Wang, Jingnan Yang, Jianchen Dang, Yu Yuan, Bowen Fu, Xin Xie, Longlong Yang, Shan Xiao, Shushu Shi, Sai Yan, Rui Zhu, Zhanchun Zuo, Can Wang, Kuijuan Jin, Qihuang Gong, Xiulai Xu

AI总结:

本研究提出利用扫描探针控制铁电薄膜BFO极化,实现对单层WSe2中局域激子的非易失性单电荷控制,在强磁场下实现约90%圆偏振度光子发射,为光子长期存储提供新途径。

摘要:

二维过渡金属硫族化合物(TMDCs)中局域激子(LXs)的单电荷控制对于在量子信息处理与存储中的潜在应用至关重要。然而,在TMDCs上施加金属栅极的传统静电掺杂方法可能导致电荷分布不均匀、光学猝灭和能量损耗。在此,通过使用扫描探针局部控制铁电薄膜BiFeO3(BFO)的铁电极化,我们可以确定性地调控单层WSe2的掺杂类型,从而实现p型和n型掺杂。这种非易失性方法能够在无外加电压的情况下长时间保持掺杂类型并维持局域激子电荷。我们的工作表明,BFO的铁电极化能够有效控制LXs的电荷。通过磁光测量证实,在不同的铁电极化区域观察到了中性和带电的LXs。在强磁场下,实现了这些量子发射体约90%的高圆偏振度的光子发射。以非易失性方式控制LXs的单电荷,在实现具有所需电荷态的确定性光子发射及光子长期存储方面展现出巨大潜力。

英文摘要:

Single charge control of localized excitons (LXs) in two-dimensional transition metal dichalcogenides (TMDCs) is crucial for potential applications in quantum information processing and storage. However, traditional electrostatic doping method with applying metallic gates onto TMDCs may cause the inhomogeneous charge distribution, optical quench, and energy loss. Here, by locally controlling the ferroelectric polarization of the ferroelectric thin film BiFeO3 (BFO) with a scanning probe, we can deterministically manipulate the doping type of monolayer WSe2 to achieve the p-type and n-type doping. This nonvolatile approach can maintain the doping type and hold the localized excitonic charges for a long time without applied voltage. Our work demonstrated that ferroelectric polarization of BFO can control the charges of LXs effectively. Neutral and charged LXs have been observed in different ferroelectric polarization regions, confirmed by magnetic optical measurement. Highly circular polarization degree about 90 % of the photon emission from these quantum emitters have been achieved in high magnetic fields. Controlling single charge of LXs in a non-volatile way shows a great potential for deterministic photon emission with desired charge states for photonic long-term memory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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