Modulation of New Excitons in Transition Metal Dichalcogenide‐Perovskite Oxide System

Advanced Science

卷:6

Paolo Emilio Trevisanutto¹  Manish Chhowalla²  Shengwei Zeng³  Lei Xu³  Teguh Citra Asmara³  Qixing Wang³  Andrivo Rusydi³  Andrew T. S. Wee³  Chi Sin Tang³  Shi Jie Wang³  Yuan Ping Feng³  Ariando Ariando³  Xin Yu Chin⁴  Ming Yang⁵  Jing Wu⁵  Xinmao Yin⁶  Wenjing Zhang⁶ 

[1] Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore Singapore 117551 Singapore;

[2] Department of Materials Science and Metallurgy University of Cambridge Cambridge CB30FS UK;

[3] Department of Physics Faculty of Science National University of Singapore Singapore 117542 Singapore;

[4] Energy Research Institute @ NTU (ERI@N) Research Techno Plaza X‐Frontier Block, Level 5, 50 Nanyang Drive Singapore 637553 Singapore;

[5] Institute of Materials Research and Engineering A∗STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way Singapore 138634 Singapore;

[6] International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China;

关键词: 2D transition metal dichalcogenides;    electronic correlations;    excitons;    heterointerfaces;    perovskite oxides;   

DOI  :  10.1002/advs.201900446

来源: DOAJ

【 摘 要 】

Abstract The exciton, a quasi‐particle that creates a bound state of an electron and a hole, is typically found in semiconductors. It has attracted major attention in the context of both fundamental science and practical applications. Transition metal dichalcogenides (TMDs) are a new class of 2D materials that include direct band‐gap semiconductors with strong spin–orbit coupling and many‐body interactions. Manipulating new excitons in semiconducting TMDs could generate a novel means of application in nanodevices. Here, the observation of high‐energy excitonic peaks in the monolayer‐MoS2 on a SrTiO3 heterointerface generated by a new complex mechanism is reported, based on a comprehensive study that comprises temperature‐dependent optical spectroscopies and first‐principles calculations. The appearance of these excitons is attributed to the change in many‐body interactions that occurs alongside the interfacial orbital hybridization and spin–orbit coupling brought about by the excitonic effect propagated from the substrate. This has further led to the formation of a Fermi‐surface feature at the interface. The results provide an atomic‐scale understanding of the heterointerface between monolayer‐TMDs and perovskite oxide and highlight the importance of spin–orbit–charge–lattice coupling on the intrinsic properties of atomic‐layer heterostructures, which open up a way to manipulate the excitonic effects in monolayer TMDs via an interfacial system.

【 授权许可】

Unknown