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Electric Control of 2D Van Hove Singularity in Oxide Ultra-Thin Films

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Title
Electric Control of 2D Van Hove Singularity in Oxide Ultra-Thin Films
Author(s)
Donghan Kim; Younsik Kim; Byungmin Sohn; Minsoo Kim; Bongju Kim; Tae Won Noh; Changyoung Kim
Publication Date
2023-04
Journal
Advanced Materials, v.35, no.17
Publisher
John Wiley and Sons Inc
Abstract
Divergent density of states (DOS) can induce extraordinary phenomena such as significant enhancement of superconductivity and unexpected phase transitions. Moreover, van Hove singularities (VHSs) lead to divergent DOS in 2D systems. Despite recent interest in VHSs, only a few controllable cases have been reported to date. In this work, by utilizing an atomically ultra-thin SrRuO3 film, the electronic structure of a 2D VHS is investigated with angle-resolved photoemission spectroscopy and transport properties are controlled. By applying electric fields with alkali metal deposition and ionic-liquid gating methods, the 2D VHS and the sign of the charge carrier are precisely controlled. Use of a tunable 2D VHS in an atomically flat oxide film could serve as a new strategy to realize infinite DOS near the Fermi level, thereby allowing efficient tuning of electric properties. © 2023 Wiley-VCH GmbH.
URI
https://pr.ibs.re.kr/handle/8788114/13319
DOI
10.1002/adma.202207188
ISSN
0935-9648
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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