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Article: Observation of Intervalley Quantum Interference in Epitaxial Monolayer Tungsten Diselenide

TitleObservation of Intervalley Quantum Interference in Epitaxial Monolayer Tungsten Diselenide
Authors
Issue Date2015
PublisherMacmillan Publishers Limited. The Journal's web site is located at http://www.nature.com/ncomms/index.html
Citation
Nature Communications, 2015, v. 6, article no. 8180 How to Cite?
Abstract© 2015 Macmillan Publishers Limited. The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin-valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental observation of quasi-particle interference patterns in monolayer WSe 2 using low-temperature scanning tunnelling spectroscopy. We observe intervalley quantum interference involving the Q valleys in the conduction band due to spin-conserving scattering processes, while spin-flipping intervalley scattering is absent. Our results establish unequivocally the presence of spin-valley coupling and affirm the large spin splitting at the Q valleys. Importantly, the inefficient spin-flipping scattering implies long valley and spin lifetime in monolayer WSe 2, which is a key figure of merit for valley-spintronic applications.
Persistent Identifierhttp://hdl.handle.net/10722/218813

 

DC FieldValueLanguage
dc.contributor.authorLiu, H-
dc.contributor.authorCHEN, J-
dc.contributor.authorYu, H-
dc.contributor.authorYang, F-
dc.contributor.authorJIAO, L-
dc.contributor.authorLiu, GB-
dc.contributor.authorHo, WK-
dc.contributor.authorGao, CL-
dc.contributor.authorJia, JF-
dc.contributor.authorYao, W-
dc.contributor.authorXie, MH-
dc.date.accessioned2015-09-18T06:54:07Z-
dc.date.available2015-09-18T06:54:07Z-
dc.date.issued2015-
dc.identifier.citationNature Communications, 2015, v. 6, article no. 8180-
dc.identifier.urihttp://hdl.handle.net/10722/218813-
dc.description.abstract© 2015 Macmillan Publishers Limited. The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin-valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental observation of quasi-particle interference patterns in monolayer WSe 2 using low-temperature scanning tunnelling spectroscopy. We observe intervalley quantum interference involving the Q valleys in the conduction band due to spin-conserving scattering processes, while spin-flipping intervalley scattering is absent. Our results establish unequivocally the presence of spin-valley coupling and affirm the large spin splitting at the Q valleys. Importantly, the inefficient spin-flipping scattering implies long valley and spin lifetime in monolayer WSe 2, which is a key figure of merit for valley-spintronic applications.-
dc.languageeng-
dc.publisherMacmillan Publishers Limited. The Journal's web site is located at http://www.nature.com/ncomms/index.html-
dc.relation.ispartofNature Communications-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleObservation of Intervalley Quantum Interference in Epitaxial Monolayer Tungsten Diselenide-
dc.typeArticle-
dc.identifier.emailLiu, H: liuhenry@HKUCC-COM.hku.hk-
dc.identifier.emailYu, H: yuhongyi@hku.hk-
dc.identifier.emailHo, WK: howk@hku.hk-
dc.identifier.emailYao, W: wangyao@hku.hk-
dc.identifier.emailXie, MH: mhxie@hku.hk-
dc.identifier.authorityYao, W=rp00827-
dc.identifier.authorityXie, MH=rp00818-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/ncomms9180-
dc.identifier.scopuseid_2-s2.0-84940706335-
dc.identifier.hkuros253527-
dc.identifier.volume6-
dc.identifier.spagearticle no. 8180-
dc.identifier.epagearticle no. 8180-

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