近日，中国科学技术大学霍永恒团队通过优化表面钝化提高单量子点的确定性共振荧光性能。相关论文发表在2025年4月22日出版的《光：科学与应用》杂志上。

表面态引起的退化限制了近表面半导体量子点（QD）的性能。研究组展示了优化的钝化技术，通过点对点比较来提高共振荧光（RF）。这些优化的技术首次降低了现有脉冲RF信号的线宽和噪声水平，并恢复了最初消失的脉冲RF信号。通过光学和表面科学表征，证实了这些改进源于钝化后表面态密度和电场的降低。该研究促进了钝化技术在薄膜量子器件中的应用，为进一步开发基于量子点的最佳量子光源铺平了道路。

附：英文原文

Title: Deterministic resonance fluorescence improvement of single quantum dots by optimized surface passivation

Author: Zhao, Junyi, Liu, Runze, Zou, Gengyan, Ge, Zhenxuan, Zhang, Qihang, Qiao, Yukun, Ding, Xing, Jiang, Guoqiu, Lou, Yiyang, Guo, Yongpeng, Chung, Tunghsun, He, Yuming, Lu, Chaoyang, Huo, Yongheng, Pan, Jianwei

Issue&Volume: 2025-04-22

Abstract: The degradation caused by surface states restricts the performance of near-surface semiconductor quantum dots (QDs). Here, we demonstrate optimized passivation techniques to improve the resonance fluorescence (RF) with dot-to-dot comparisons. These optimized techniques, for the first time, reduce the linewidth and noise level of existing pulsed-RF signals, as well as revive pulsed-RF signals which originally are vanishing. The improvements are confirmed to originate from reduced surface state density and electric field after passivation, through optical and surface science characterizations. Our study promotes applications of the passivation techniques in thin-film quantum devices, paving the way for the further development of optimal QD-based quantum light sources.

DOI: 10.1038/s41377-025-01838-6

Source: https://www.nature.com/articles/s41377-025-01838-6