4 years ago

Extended Polymorphism of Two-Dimensional Material

Extended Polymorphism of Two-Dimensional Material
Masaki Nakano, Akihiko Fujiwara, Yijin Zhang, Masaro Yoshida, Yoshihiro Iwasa, Norio Kobayashi, Yasuhiko Imai, Shigeru Kimura, Terukazu Nishizaki, Jianting Ye
When controlling electronic properties of bulk materials, we usually assume that the basic crystal structure is fixed. However, in two-dimensional (2D) materials, atomic structure or polymorph is attracting growing interest as a controlling parameter to functionalize their properties. Various polymorphs can exist in transition metal dichalcogenides (TMDCs) from which 2D materials are generated, and polymorphism has drastic impacts on the electronic states. Here we report the discovery of an unprecedented polymorph of a TMDC 2D material. By mechanical exfoliation, we made thin flakes from a single crystal of 2Ha-type tantalum disulfide (TaS2), a metallic TMDC with a charge-density-wave (CDW) phase. Microbeam X-ray diffraction measurements and electrical transport measurements indicate that thin flakes possess a polymorph different from any one known in TaS2 bulk crystals. Moreover, the flakes with the unique polymorph displayed the dramatically enhanced CDW ordering temperature. The present results suggest the potential existence of diverse structural and electronic phases accessible only in 2D materials.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b02374

DOI: 10.1021/acs.nanolett.7b02374

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