Ultrafast probes of electron–hole transitions between two atomic layers

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dc.citation.articleNumber1859
dc.citation.journalTitleNature Communications
dc.citation.volumeNumber9
dc.contributor.authorWen, Xiewen
dc.contributor.authorChen, Hailong
dc.contributor.authorWu, Tianmin
dc.contributor.authorYu, Zhihao
dc.contributor.authorYang, Qirong
dc.contributor.authorDeng, Jingwen
dc.contributor.authorLiu, Zhengtang
dc.contributor.authorGuo, Xin
dc.contributor.authorGuan, Jianxin
dc.contributor.authorZhang, Xiang
dc.contributor.authorGong, Yongji
dc.contributor.authorYuan, Jiangtan
dc.contributor.authorZhang, Zhuhua
dc.contributor.authorYi, Chongyue
dc.contributor.authorGuo, Xuefeng
dc.contributor.authorAjayan, Pulickel M.
dc.contributor.authorZhuang, Wei
dc.contributor.authorLiu, Zhirong
dc.contributor.authorLou, Jun
dc.contributor.authorZheng, Junrong
dc.date.accessioned2018-09-26T14:52:43Z
dc.date.available2018-09-26T14:52:43Z
dc.date.issued2018
dc.description.abstractPhase transitions of electron-hole pairs on semiconductor/conductor interfaces determine fundamental properties of optoelectronics. To investigate interfacial dynamical transitions of charged quasiparticles, however, remains a grand challenge. By employing ultrafast mid-infrared microspectroscopic probes to detect excitonic internal quantum transitions and two-dimensional atomic device fabrications, we are able to directly monitor the interplay between free carriers and insulating interlayer excitons between two atomic layers. Our observations reveal unexpected ultrafast formation of tightly bound interlayer excitons between conducting graphene and semiconducting MoSe2. The result suggests carriers in the doped graphene are no longer massless, and an effective mass as small as one percent of free electron mass is sufficient to confine carriers within a 2D hetero space with energy 10 times larger than the room-temperature thermal energy. The interlayer excitons arise within 1 ps. Their formation effectively blocks charge recombination and improves charge separation efficiency for more than one order of magnitude.
dc.identifier.citationWen, Xiewen, Chen, Hailong, Wu, Tianmin, et al.. "Ultrafast probes of electron–hole transitions between two atomic layers." <i>Nature Communications,</i> 9, (2018) Springer Nature: https://doi.org/10.1038/s41467-018-04291-9.
dc.identifier.digitals41467-018-04291-9
dc.identifier.doihttps://doi.org/10.1038/s41467-018-04291-9
dc.identifier.urihttps://hdl.handle.net/1911/102716
dc.language.isoeng
dc.publisherSpringer Nature
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleUltrafast probes of electron–hole transitions between two atomic layers
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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