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황진웅,황춘규,정낙관,A. D. N’Diaye,A. K. Schmid,Jonathan Denlinger 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.4
The interface between graphene and a ferromagnetic substrate has attracted recent research interests due to its potential for spintronic applications. We report an angle-resolved photoemission spectroscopy study on the interface between graphene and cobalt epitaxially grown on a tungsten substrate. We find that the electron band structure of the interface exhibits clear discontinuities at the crossing points with cobalt 3d bands. These observations indicate strong hybridizations between the electronic states in the interface and provide an important clue to understand the intriguing electromagnetic properties of the graphene/ferromagnet interface.
Controlling spin-orbit coupling strength of bulk transition metal dichalcogenide semiconductors
이영훈,Eu Pilsun,임창영,차재훈,김성헌,Denlinger Jonathan D.,김영관 한국물리학회 2021 Current Applied Physics Vol.30 No.-
Transition metal dichalcogenide (TMD) semiconductors are attracting much attention in research regarding device physics based on their unique properties that can be utilized in spintronics and valleytronics. Although current studies concentrate on the monolayer form due to the explicitly broken inversion symmetry and the direct band gap, bulk materials also hold the capability of carrying spin and valley current. In this study, we report the methodology to continuously control the spin-orbit coupling (SOC) strength of bulk TMDs Mo1-xWxSe2 by changing the atomic ratio between Mo and W. The results show the size of band splitting at the K valley the measure of the coupling strength is linearly proportional to the atomic ratio of Mo and W. Our results thus demonstrate how to precisely tune the SOC coupling strength, and the collected information of which can serve as a reference for future applications of bulk TMDs.
Electronic-dimensionality reduction of bulk MoS<sub>2</sub> by hydrogen treatment
Cho, Soohyun,Kim, Beom Seo,Kim, Beomyoung,Kyung, Wonshik,Seo, Jeongjin,Park, Min,Jeon, Jun Woo,Tanaka, Kiyohisa,Denlinger, Jonathan D.,Kim, Changyoung,Odkhuu, Dorj,Kim, Byung Hoon,Park, Seung Ryong The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.35
<P>A reduction in the electronic-dimensionality of materials is one method for achieving improvements in material properties. Here, a reduction in electronic-dimensionality is demonstrated using a simple hydrogen treatment technique. Quantum well states from hydrogen-treated bulk 2H-MoS2 are observed using angle resolved photoemission spectroscopy (ARPES). The electronic states are confined within a few MoS2 layers after the hydrogen treatment. A significant reduction in the band-gap can also be achieved after the hydrogen treatment, and both phenomena can be explained by the formation of sulfur vacancies generated by the chemical reaction between sulfur and hydrogen.</P>
Interlayer-state-driven superconductivity inCaC6studied by angle-resolved photoemission spectroscopy
Kyung, Wonshik,Kim, Yeongkwan,Han, Garam,Leem, Choonshik,Kim, Chul,Koh, Yoonyoung,Kim, Beomyoung,Kim, Youngwook,Kim, Jun Sung,Kim, Keun Su,Rotenberg, Eli,Denlinger, Jonathan D.,Kim, Changyoung American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.22