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Sökning: WFRF:(Kim Changyoung)

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1.
  • Kwon, Junyoung, et al. (författare)
  • Universality of charge doping driven metal-insulator transition in Sr2RhO4 and role of spin-orbit coupling
  • 2022
  • Ingår i: Physical Review B. - 2469-9969 .- 2469-9950. ; 106:24
  • Tidskriftsartikel (refereegranskat)abstract
    • We performed angle-resolved photoemission spectroscopy (ARPES) experiments on an electron-doped Sr2RhO4 system Sr2-xCexRhO4 in order to investigate the electron doping-induced metal-insulator transition (MIT). We establish the universality of MIT in electron-doped Sr2RhO4 by comparing results from Sr2-xLaxRhO4 and Sr2-xCexRhO4. Via a systematic analysis of doping-dependent transport and ARPES data, we show that the correlation driven MIT with a noninteger electron number in electron-doped Sr2RhO4 is universal and thus independent of the dopant. Within the universality, the ARPES analysis shows that the band topology determined by the spin-orbit coupling (SOC) is likely a control parameter of the insulating gap size and critical electron number of the MIT. We present a phase diagram of the insulating phase as a function of the effective SOC and electron number.
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2.
  • Cho, Soohyun, et al. (författare)
  • Observation of Dresselhaus type spin splitting of zinc blende structure semiconductors by circular dichroic photoemission study
  • 2021
  • Ingår i: Current Applied Physics. - : Elsevier BV. - 1567-1739. ; 30, s. 96-101
  • Tidskriftsartikel (refereegranskat)abstract
    • Material family of zinc blende structure semiconductors (ZBSSs) is important for novel technique such as spintronics. A study of the ZBSS spin-splitting structure in momentum space is essential when seeking to understand the exotic properties of the material. The Dresselhaus field predominates in the bulk, but the Rashba field plays important roles in states near the surface. Here, we used circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) to explore the spin-splitting structure of bulk ZBSS in momentum space. The observed structure was well-explained by a Dresselhaus field attributable to the lack of inversion symmetry in ZBSS crystals. We show that CD-ARPES usefully reveals spin-splitting in momentum space. CD-ARPES combined with hard x-ray incident-beam would be useful to investigate the spin-splitting structures of the interface states in the ZBSS heterostructure.
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