Emergence of a Metal-Insulator Transition and High-Temperature Charge-Density Waves in VSe2 at the Monolayer Limit

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Title
Emergence of a Metal-Insulator Transition and High-Temperature Charge-Density Waves in VSe2 at the Monolayer Limit
Author(s)
Ganbat Duvjir; Byoung Ki Choi; Iksu Jang; Søren Ulstrup; Soonmin Kang; Trinh Thi Ly; Sanghwa Kim; Young Hwan Choi; Chris Jozwiak; Aaron Bostwick; Eli Rotenberg; Je-Geun Park; Raman Sankar; Ki-Seok Kim; Jungdae Kim; Young Jun Chang
Publication Date
2018-09
Journal
NANO LETTERS, v.18, no.9, pp.5432 - 5438
Publisher
AMER CHEMICAL SOC
Abstract
Emergent phenomena driven by electronic reconstructions in oxide heterostructures have been intensively discussed. However, the role of these phenomena in shaping the electronic properties in van der Waals heterointerfaces has hitherto not been established. By reducing the material thickness and forming a heterointerface, we find two types of charge-ordering transitions in monolayer VSe2 on graphene substrates. Angle-resolved photoemission spectroscopy (ARPES) uncovers that Fermi-surface nesting becomes perfect in ML VSe2. Renormalization-group analysis confirms that imperfect nesting in three dimensions universally flows into perfect nesting in two dimensions. As a result, the charge-density wave-transition temperature is dramatically enhanced to a value of 350 K compared to the 105 K in bulk VSe2. More interestingly, ARPES and scanning tunneling microscopy measurements confirm an unexpected metal-insulator transition at 135 K that is driven by lattice distortions. The heterointerface plays an important role in driving this novel metal-insulator transition in the family of monolayer transition-metal dichalcogenides. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5182
ISSN
1530-6984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
2018-254_Emergence of a Metal–Insulator Transition and High-Temperature Charge-Density Waves in VSe2 at the Monolayer Limit.pdfDownload

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