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Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure.
Nano Letters ( IF 9.6 ) Pub Date : 2019-12-26 , DOI: 10.1021/acs.nanolett.9b04528 Tianmeng Wang 1 , Shengnan Miao 1 , Zhipeng Li 1 , Yuze Meng 1 , Zhengguang Lu 2, 3 , Zhen Lian 1 , Mark Blei 4 , Takashi Taniguchi 5 , Kenji Watanabe 5 , Sefaattin Tongay 5 , Dmitry Smirnov 2 , Su-Fei Shi 1, 6
Nano Letters ( IF 9.6 ) Pub Date : 2019-12-26 , DOI: 10.1021/acs.nanolett.9b04528 Tianmeng Wang 1 , Shengnan Miao 1 , Zhipeng Li 1 , Yuze Meng 1 , Zhengguang Lu 2, 3 , Zhen Lian 1 , Mark Blei 4 , Takashi Taniguchi 5 , Kenji Watanabe 5 , Sefaattin Tongay 5 , Dmitry Smirnov 2 , Su-Fei Shi 1, 6
Affiliation
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Transition metal dichalcogenides (TMDCs) heterostructure with a type II alignment hosts unique interlayer excitons with the possibility of spin-triplet and spin-singlet states. However, the associated spectroscopy signatures remain elusive, strongly hindering the understanding of the Moiré potential modulation of the interlayer exciton. In this work, we unambiguously identify the spin-singlet and spin-triplet interlayer excitons in the WSe2/MoSe2 heterobilayer with a 60° twist angle through the gate- and magnetic field-dependent photoluminescence spectroscopy. Both the singlet and triplet interlayer excitons show giant valley-Zeeman splitting between the K and K' valleys, a result of the large Landé g-factor of the singlet interlayer exciton and triplet interlayer exciton, which are experimentally determined to be ∼10.7 and ∼15.2, respectively, which is in good agreement with theoretical expectation. The photoluminescence (PL) from the singlet and triplet interlayer excitons show opposite helicities, determined by the atomic registry. Helicity-resolved photoluminescence excitation (PLE) spectroscopy study shows that both singlet and triplet interlayer excitons are highly valley-polarized at the resonant excitation with the valley polarization of the singlet interlayer exciton approaching unity at ∼20 K. The highly valley-polarized singlet and triplet interlayer excitons with giant valley-Zeeman splitting inspire future applications in spintronics and valleytronics.
中文翻译：
从WSe2 / MoSe2异质结构中的自旋单重和自旋三重夹层激子分裂出来的Giant Valley-Zeeman。
具有II型排列的过渡金属二硫杂化物（TMDC）异质结构具有独特的层间激子，并可能具有自旋三重态和自旋单态。然而，相关的光谱学特征仍然难以捉摸，严重阻碍了对层间激子的莫尔电位调制的理解。在这项工作中，我们通过依赖于栅极和磁场的光致发光光谱学，明确地确定了WSe2 / MoSe2异质双层中具有60°扭曲角的自旋单重和自旋三重夹层激子。单重态和三重态层间激子都显示出在K和K'谷之间的巨大的山谷-Zeeman分裂，这是单重态层间激子和三重态层间激子的大Landég因子的结果，根据实验确定，朗德g因子约为10.7和〜 15.2，分别 这与理论预期非常吻合。单重态和三重态层间激子的光致发光（PL）显示出相反的螺旋度，由原子登记处确定。螺旋分辨光致发光激发（PLE）光谱研究表明，单重态和三重态层间激子在共振激发时均呈高谷极化，而单重态层间激子的谷极极化在约20 K时趋于统一。三重态层间激子和巨大的Valley-Zeeman分裂激发了自旋电子学和Valleytronics的未来应用。
更新日期：2019-12-27
中文翻译：
从WSe2 / MoSe2异质结构中的自旋单重和自旋三重夹层激子分裂出来的Giant Valley-Zeeman。
具有II型排列的过渡金属二硫杂化物（TMDC）异质结构具有独特的层间激子，并可能具有自旋三重态和自旋单态。然而，相关的光谱学特征仍然难以捉摸，严重阻碍了对层间激子的莫尔电位调制的理解。在这项工作中，我们通过依赖于栅极和磁场的光致发光光谱学，明确地确定了WSe2 / MoSe2异质双层中具有60°扭曲角的自旋单重和自旋三重夹层激子。单重态和三重态层间激子都显示出在K和K'谷之间的巨大的山谷-Zeeman分裂，这是单重态层间激子和三重态层间激子的大Landég因子的结果，根据实验确定，朗德g因子约为10.7和〜 15.2，分别 这与理论预期非常吻合。单重态和三重态层间激子的光致发光（PL）显示出相反的螺旋度，由原子登记处确定。螺旋分辨光致发光激发（PLE）光谱研究表明，单重态和三重态层间激子在共振激发时均呈高谷极化，而单重态层间激子的谷极极化在约20 K时趋于统一。三重态层间激子和巨大的Valley-Zeeman分裂激发了自旋电子学和Valleytronics的未来应用。
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