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arXiv 2601.16319cond-mat.mes-hall
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通过纵向激子衍射研究单层WSe₂中的威金斯晶体化

Optical probing of Wigner crystallization in monolayer WSe$_2$ via diffraction of longitudinal excitons

ITMO University(ITMO大学);Moscow Institute of Physics and Technology (National Research University)(莫斯科物理科学与技术学院(国立研究大学));Russian Quantum Center(俄罗斯量子中心);Laboratory of Programmable Functional Materials, Center for Neurophysics and Neuromorphic Technologies(可编程功能材料实验室,神经物理与类脑技术中心);Moscow Center for Advanced Studies(莫斯科高级研究中心);Queen’s University(女王大学)

Artem N. Abramov, Emil Chiglintsev, Tatiana Oskolkova, Maria Titova, Mikhail Kashchenko, Alexander Chernov, Vasily Kravtsov, Ivan V. Iorsh

AI总结:

研究通过纵向激子衍射观测单层WSe₂中威金斯晶体化现象,揭示了TMDs中价带电子相关相的光学探测机制。

摘要:

单层过渡金属二硫化物(TMDs)具有较大的载流子有效质量及抑制的库仑相互作用屏蔽,这显著增强了这些结构中的相关效应。直接带隙允许有效光学探测这些相关性。本文通过测量激子在威金斯晶体(WC)周期势能中的衍射,实验证实了在无外加磁场、温度低于26 K及载流子浓度低于2×10¹¹ cm⁻²时,单层WSe₂中形成威金斯晶体相。强的激子纵向-横向分裂由长程区间谷交换相互作用诱导,导致主激子峰与第一衍射峰之间有显著的频移。本研究结果表明,TMDs中价带电子的谷自由度有助于探测这些结构中的相关电子相。

英文摘要:

Monolayer transition metal dichalcogenides (TMDs) are characterized by relatively large carrier effective masses and suppressed screening of the Coulomb interaction, which substantially enhances the correlation effects in these structures. The direct band gap allows to effectively optically probe these correlations. Here, we present an experimental observation of Wigner crystallization in monolayer $\mathrm{WSe}_2$ probed by the measurement of the exciton diffraction on the Wigner crystal (WC) periodic potential. We observe the formation of the WC phase in the absence of external magnetic fields at temperature range $T<26~\mathrm{K}$ and carrier concentrations $n$ $<2\times10^{11}~\mathrm{cm}^{-2}$. The direct observation of the exciton diffraction is enabled by the strong exciton longitudinal-transverse splitting induced by the long-range intervalley exchange interaction, leading to the large detuning between main exciton peak and first diffraction peak. Our findings highlight that the valley degree of freedom of charge carriers in TMDs facilitates optical probing of correlated electron phases in these structures.

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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