Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe(2)/CrBr(3) van der Waals heterostructures.
Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe(2)/CrBr(3) van der Waals heterostructures.
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DOI：
10.1038/s41467-020-19816-4
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发表时间：
2020-11-26
影响因子：
16.6
通讯作者：
Tartakovskii AI
中科院分区：
文献类型：
--
作者：
Lyons TP;Gillard D;Molina-Sánchez A;Misra A;Withers F;Keatley PS;Kozikov A;Taniguchi T;Watanabe K;Novoselov KS;Fernández-Rossier J;Tartakovskii AI
货车德瓦尔斯异质结构中的半导体铁磁-非磁界面提供了一个独特的机会来研究磁邻近相互作用，该相互作用取决于多种现象，包括谷和层伪自旋、莫尔周期性或异常强的库仑结合。在这里，我们报告的MoSe 2和CrBr 3之间的磁邻近效应的光致发光的电荷状态的依赖性，从而谷极化的MoSe 2 trion状态符合密切的本地CrBr 3磁化，而中性激子状态保持不敏感的铁磁体。我们把这归因于自旋相关的层间电荷转移发生在激子和三重子辐射寿命之间的时间尺度上。更进一步，我们通过磁光克尔效应和光致发光揭示了对比谷偏振的域状空间形貌，我们推断其是锯齿状的或高度复杂的，其特征小于400 nm，对应于我们的光学分辨率。我们的研究结果提供了一个独特的见解短寿命的谷激子和自旋相关的层间隧穿之间的相互作用，同时也突出了MoSe 2作为一个有前途的候选人，光学接口与异国情调的自旋纹理在货车德瓦尔斯结构。货车德瓦耳斯材料的一个优点是能够将不同的材料联合收割机分层组合以形成新的异质结构。在这里，作者研究了CrBr 3和MoSe 2的异质结构，发现CrBr 3的铁磁性增强了MoSe 2的谷依赖光学响应。
Semiconducting ferromagnet-nonmagnet interfaces in van der Waals heterostructures present a unique opportunity to investigate magnetic proximity interactions dependent upon a multitude of phenomena including valley and layer pseudospins, moiré periodicity, or exceptionally strong Coulomb binding. Here, we report a charge-state dependency of the magnetic proximity effects between MoSe2 and CrBr3 in photoluminescence, whereby the valley polarization of the MoSe2 trion state conforms closely to the local CrBr3 magnetization, while the neutral exciton state remains insensitive to the ferromagnet. We attribute this to spin-dependent interlayer charge transfer occurring on timescales between the exciton and trion radiative lifetimes. Going further, we uncover by both the magneto-optical Kerr effect and photoluminescence a domain-like spatial topography of contrasting valley polarization, which we infer to be labyrinthine or otherwise highly intricate, with features smaller than 400 nm corresponding to our optical resolution. Our findings offer a unique insight into the interplay between short-lived valley excitons and spin-dependent interlayer tunneling, while also highlighting MoSe2 as a promising candidate to optically interface with exotic spin textures in van der Waals structures. One advantage of van der Waals materials is the ability to combine different materials in layers to form new heterostructures. Here, the authors investigate heterostructures of CrBr3 and MoSe2, and find that the ferromagnetism of CrBr3 enhances the valley dependent optical response of the MoSe2.
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影响因子：
4
作者：
DILLON, JF;KAMIMURA, H;REMEIKA, JP
通讯作者：
REMEIKA, JP
影响因子：
10.8
作者：
Jakubczyk T;Delmonte V;Koperski M;Nogajewski K;Faugeras C;Langbein W;Potemski M;Kasprzak J
通讯作者：
Kasprzak J
影响因子：
38.3
作者：
Huang, Bevin;Clark, Genevieve;Xu, Xiaodong
通讯作者：
Xu, Xiaodong
影响因子：
34.3
作者：
Ghazaryan, D.;Greenaway, M. T.;Misra, A.
通讯作者：
Misra, A.
影响因子：
3.7
作者：
Jagla, EA
通讯作者：
Jagla, EA