Metallic 1T Phase, 3d¹ Electronic Configuration and Charge Density Wave Order in Molecular Beam Epitaxy Grown Monolayer Vanadium Ditelluride

Ping Kwan Johnny Wong; Wen Zhang; Jun Zhou; Fabio Bussolotti; Xinmao Yin; Lei Zhang; Alpha T. N’Diaye; Simon A. Morton; Wei Chen; Johnson Goh; Michel P. de Jong; Yuan Ping Feng; Andrew T. S. Wee

doi:10.1021/acsnano.9b05349

journal article·2019-11-26Open access

Metallic 1T Phase, 3d¹ Electronic Configuration and Charge Density Wave Order in Molecular Beam Epitaxy Grown Monolayer Vanadium Ditelluride

Ping Kwan Johnny Wong, Wen Zhang, Jun Zhou, Fabio Bussolotti, Xinmao Yin, Lei Zhang, Alpha T. N’Diaye, Simon A. Morton, Wei Chen, Johnson Goh, Michel P. de Jong, Yuan Ping Feng, Andrew T. S. Wee

ACS Nano· Volume 13· Issue 11

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Abstract

We present a combined experimental and theoretical study of monolayer vanadium ditelluride, VTe2, grown on highly oriented pyrolytic graphite by molecular-beam epitaxy. Using various in situ microscopic and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, together with theoretical analysis by density functional theory calculations, we demonstrate direct evidence of the metallic 1T phase and 3d1 electronic configuration in monolayer VTe2 that also features a (4 × 4) charge density wave order at low temperatures. In contrast to previous theoretical predictions, our element-specific characterization by X-ray magnetic circular dichroism rules out a ferromagnetic order intrinsic to the monolayer. Our findings provide essential knowledge necessary for understanding this interesting yet less explored metallic monolayer in the emerging family of van der Waals magnets.

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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore

Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore

Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology, and Research (A*Star), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore

Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley CA94720, United States

Department of Chemistry, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore

NanoElectronics Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands

Funding

Ministry of Education - Singapore · National Research Foundation Singapore · Science and Engineering Research Council

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