Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films

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dc.citation.articleNumber115149
dc.citation.issueNumber11
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber102
dc.contributor.authorChen, Guannan
dc.contributor.authorHoward, Sean T.
dc.contributor.authorMaghirang, Aniceto B.
dc.contributor.authorNguyen Cong, Kien
dc.contributor.authorVillaos, Rovi Angelo B.
dc.contributor.authorFeng, Liang-Ying
dc.contributor.authorCai, Kehan
dc.contributor.authorGanguli, Somesh C.
dc.contributor.authorSwiech, Waclaw
dc.contributor.authorMorosan, Emilia
dc.contributor.authorOleynik, Ivan I.
dc.contributor.authorChuang, Feng-Chuan
dc.contributor.authorLin, Hsin
dc.contributor.authorMadhavan, Vidya
dc.contributor.orgRice Center for Quantum Materials
dc.date.accessioned2020-11-06T03:04:40Z
dc.date.available2020-11-06T03:04:40Z
dc.date.issued2020
dc.description.abstractThe electronic and magnetic properties of transition metal dichalcogenides are known to be extremely sensitive to their structure. In this paper we study the effect of structure on the electronic and magnetic properties of mono- and bilayer VSe2 films grown using molecular beam epitaxy. VSe2 has recently attracted much attention due to reports of emergent ferromagnetism in the two-dimensional (2D) limit. To understand this compound, high-quality 1T and distorted 1T films were grown at temperatures of 200 °C and 450 °C, respectively, and studied using 4 K scanning tunneling microscopy and spectroscopy. The measured density of states and the charge density wave (CDW) patterns were compared to band structure and phonon dispersion calculations. Films in the 1T phase reveal different CDW patterns in the first layer compared to the second. Interestingly, we find the second layer of the 1T film shows a CDW pattern with 4a×4a periodicity which is the 2D version of the bulk CDW observed in this compound. Our phonon dispersion calculations confirm the presence of a soft phonon at the correct wave vector that leads to this CDW. In contrast, the first layer of distorted 1T phase films shows a strong stripe feature with varying periodicities, while the second layer displays no observable CDW pattern. Finally, we find that the monolayer 1T VSe2 film is weakly ferromagnetic, with ∼3.5 μB per unit similar to previous reports.
dc.identifier.citationChen, Guannan, Howard, Sean T., Maghirang, Aniceto B., et al.. "Correlating structural, electronic, and magnetic properties of epitaxial VSe2 thin films." <i>Physical Review B,</i> 102, no. 11 (2020) American Physical Society: https://doi.org/10.1103/PhysRevB.102.115149.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.102.115149
dc.identifier.urihttps://hdl.handle.net/1911/109529
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleCorrelating structural, electronic, and magnetic properties of epitaxial VSe2 thin films
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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