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Observation of Strong Valley Magnetic Response in Monolayer Transition Metal Dichalcogenide Alloys of Mo0.5W0.5Se2 and Mo0.5W0.5Se2/WS2 Heterostructures
ACS Nano ( IF 15.8 ) Pub Date : 2021-04-21 , DOI: 10.1021/acsnano.0c10478 Lishu Wu 1 , Chunxiao Cong 2 , Weihuang Yang 3 , Yu Chen 1 , Yan Shao 4 , T. Thu Ha Do 1 , Wen Wen 1 , Shun Feng 1 , Chenji Zou 1 , Hongbo Zhang 1 , Bowen Du 1 , Bingchen Cao 1 , Jingzhi Shang 5 , Qihua Xiong 1 , Kian Ping Loh 4 , Ting Yu 1
ACS Nano ( IF 15.8 ) Pub Date : 2021-04-21 , DOI: 10.1021/acsnano.0c10478 Lishu Wu 1 , Chunxiao Cong 2 , Weihuang Yang 3 , Yu Chen 1 , Yan Shao 4 , T. Thu Ha Do 1 , Wen Wen 1 , Shun Feng 1 , Chenji Zou 1 , Hongbo Zhang 1 , Bowen Du 1 , Bingchen Cao 1 , Jingzhi Shang 5 , Qihua Xiong 1 , Kian Ping Loh 4 , Ting Yu 1
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Monolayer transition metal dichalcogenide (TMD) alloys have emerged as a unique material system for promising applications in electronics, optoelectronics, and spintronics due to their tunable electronic structures, effective masses of carriers, and valley polarization with various alloy compositions. Although spin–orbit engineering has been extensively studied in monolayer TMD alloys, the valley Zeeman effect in these alloys still remains largely unexplored. Here we demonstrate the enhanced valley magnetic response in Mo0.5W0.5Se2 alloy monolayers and Mo0.5W0.5Se2/WS2 heterostructures probed by magneto-photoluminescence spectroscopy. The large g factors of negatively charged excitons (trions) of Mo0.5W0.5Se2 have been extracted for both pure Mo0.5W0.5Se2 monolayers and Mo0.5W0.5Se2/WS2 heterostructures, which are attributed to the significant impact of doping-induced strong many-body Coulomb interactions on trion emissions under an out-of-plane magnetic field. Moreover, compared with the monolayer Mo0.5W0.5Se2, the slightly reduced valley Zeeman splitting in Mo0.5W0.5Se2/WS2 is a consequence of the weakened exchange interaction arising from p-doping in Mo0.5W0.5Se2via interlayer charge transfer between Mo0.5W0.5Se2 and WS2. Such interlayer charge transfer further evidences the formation of type-II band alignment, in agreement with the density functional theory calculations. Our findings give insights into the spin-valley and interlayer coupling effects in monolayer TMD alloys and their heterostructures, which are essential to develop valleytronic applications based on the emerging family of TMD alloys.
中文翻译：
Mo 0.5 W 0.5 Se 2和Mo 0.5 W 0.5 Se 2 / WS 2异质结构的单层过渡金属双硫属化物合金中强谷磁响应的观察
单层过渡金属二硫化氢（TMD）合金已成为一种独特的材料体系，可用于电子，光电子和自旋电子学，因为它们具有可调谐的电子结构，有效的载流子质量以及各种合金成分的谷底极化。尽管自旋轨道工程已经在单层TMD合金中进行了广泛的研究，但是在这些合金中的谷塞曼效应仍然在很大程度上尚未得到探索。在这里，我们证明了通过磁光致发光光谱探测的Mo 0.5 W 0.5 Se 2合金单层和Mo 0.5 W 0.5 Se 2 / WS 2异质结构中增强的谷磁响应。大对于纯Mo 0.5 W 0.5 Se 2单层和Mo 0.5 W 0.5 Se 2 / WS 2异质结构，均提取了g 0.5的Mo 0.5 W 0.5 Se 2的负电荷激子（三价子）因子，这归因于掺杂的显着影响在平面外磁场下引起的三重子发射上的强多体库仑相互作用。此外，与单层相比的Mo 0.5 W ^ 0.5硒2中，略微减少谷塞曼分裂中的Mo 0.5 W ^ 0.5硒2 / WS 2是从产生的弱化交换相互作用的结果p在掺杂的Mo 0.5 W ^ 0.5硒2经由沫之间的层间的电荷转移0.5 w ^ 0.5硒2和WS 2。这种层间电荷转移进一步证明了II型能带对准的形成，这与密度泛函理论计算相符。我们的发现为单层TMD合金及其异质结构中的自旋谷和层间耦合效应提供了洞见，这对于基于新兴的TMD合金家族发展Valleytronic应用至关重要。
更新日期：2021-05-25
中文翻译：
Mo 0.5 W 0.5 Se 2和Mo 0.5 W 0.5 Se 2 / WS 2异质结构的单层过渡金属双硫属化物合金中强谷磁响应的观察
单层过渡金属二硫化氢（TMD）合金已成为一种独特的材料体系，可用于电子，光电子和自旋电子学，因为它们具有可调谐的电子结构，有效的载流子质量以及各种合金成分的谷底极化。尽管自旋轨道工程已经在单层TMD合金中进行了广泛的研究，但是在这些合金中的谷塞曼效应仍然在很大程度上尚未得到探索。在这里，我们证明了通过磁光致发光光谱探测的Mo 0.5 W 0.5 Se 2合金单层和Mo 0.5 W 0.5 Se 2 / WS 2异质结构中增强的谷磁响应。大对于纯Mo 0.5 W 0.5 Se 2单层和Mo 0.5 W 0.5 Se 2 / WS 2异质结构，均提取了g 0.5的Mo 0.5 W 0.5 Se 2的负电荷激子（三价子）因子，这归因于掺杂的显着影响在平面外磁场下引起的三重子发射上的强多体库仑相互作用。此外，与单层相比的Mo 0.5 W ^ 0.5硒2中，略微减少谷塞曼分裂中的Mo 0.5 W ^ 0.5硒2 / WS 2是从产生的弱化交换相互作用的结果p在掺杂的Mo 0.5 W ^ 0.5硒2经由沫之间的层间的电荷转移0.5 w ^ 0.5硒2和WS 2。这种层间电荷转移进一步证明了II型能带对准的形成，这与密度泛函理论计算相符。我们的发现为单层TMD合金及其异质结构中的自旋谷和层间耦合效应提供了洞见，这对于基于新兴的TMD合金家族发展Valleytronic应用至关重要。
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