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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Multiferroic
  • Ferroelectric
  • Quantum Magnetism

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Color Theorems, Chiral Domain Topology, and Magnetic Properties of FexTaS2

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Title
Color Theorems, Chiral Domain Topology, and Magnetic Properties of FexTaS2
Author
Horibe, YoichiYang, JunjieCho, Yong-HeumLuo, XuanKim, Sung BaekOh, Yoon SeokHuang, Fei-TingAsada, ToshihiroTanimura, MakotoJeong, DalyoungCheong, Sang-Wook
Keywords
CHARGE-DENSITY WAVES; EVERY PLANAR MAP; TANTALUM DICHALCOGENIDES; MCMILLAN CONCEPT; QUASI-CRYSTALS; 2H-TASE2; DISCOMMENSURATIONS; SUPERCONDUCTIVITY; NIOBIUM
Issue Date
2014-06
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.23, pp.8368 - 8373
Abstract
Common mathematical theories can have profound applications in understanding real materials. The intrinsic connection between aperiodic orders observed in the Fibonacci sequence, Penrose tiling, and quasicrystals is a well-known example. Another example is the self-similarity in fractals and dendrites. From transmission electron microscopy experiments, we found that FexTaS2 crystals with x = 1/4 and 1/3 exhibit complicated antiphase and chiral domain structures related to ordering of intercalated Fe ions with 2a x 2a and root 3a x root 3a superstructures, respectively. These complex domain patterns are found to be deeply related with the four color theorem, stating that four colors are sufficient to identify the countries on a planar map with proper coloring and its variations for two-step proper coloring. Furthermore, the domain topology is closely relevant to their magnetic properties. Our discovery unveils the importance of understanding the global topology of domain configurations in functional materials.
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DOI
10.1021/ja5026134
ISSN
0002-7863
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PHY_Journal Papers
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