Bright dipolar excitons in twisted black phosphorus homostructures

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-10-31 DOI:10.1126/science.adq2977

Shenyang Huang, Boyang Yu, Yixuan Ma, Chenghao Pan, Junwei Ma, Yuxuan Zhou, Yaozhenghang Ma, Ke Yang, Hua Wu, Yuchen Lei, Qiaoxia Xing, Lei Mu, Jiasheng Zhang, Yanlin Mou, Hugen Yan

引用次数: 0

Abstract

Bright dipolar excitons, which contain electrical dipoles and have high oscillator strength, are an ideal platform for studying correlated quantum phenomena. They usually rely on carrier tunneling between two quantum wells or two layers to hybridize with nondipolar excitons to gain oscillator strength. In this work, we uncovered a new type of bright infrared dipolar exciton by stacking 90°-twisted black phosphorus (BP) structures. These excitons, inherent to the reconstructed band structure, exhibit high oscillator strength. Most importantly, they inherit the linear polarization from BP, which allows light polarization to be used to select the dipole direction. Moreover, the dipole moment and resonance energy can be widely tuned by the thickness of the BP. Our results demonstrate a useful platform for exploring tunable correlated dipolar excitons.

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扭曲黑磷同质结构中的明亮双极性激子

明亮的偶极激子含有电偶极子，具有很高的振荡器强度，是研究相关量子现象的理想平台。它们通常依赖两个量子阱或两个层之间的载流子隧道，与非偶极激子杂化，从而获得振荡强度。在这项工作中，我们通过堆叠 90° 扭曲的黑磷（BP）结构，发现了一种新型明亮的红外双极性激子。这些激子是重建带状结构所固有的，具有很高的振荡器强度。最重要的是，它们继承了 BP 的线性偏振，从而可以利用光偏振来选择偶极子方向。此外，偶极矩和共振能量可以通过 BP 的厚度进行广泛调整。我们的研究结果为探索可调谐相关偶极激子提供了一个有用的平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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