[16p-PA7-1~40] 17 Nanocarbon and Two-Dimensional Materials (Poster)

English Presentation

[16p-PA7-22] Molybdenum Disulfide (MoS2): Superconductivity and Gate-Controlled K+ Intercalation

〇(DC)Alec Paul Romagosa^1,2, Ricky Dwi Septiano², Hideki Matsuoka^2,3, Yutaka Majima¹, Yoshihiro Iwasa^2,3 (1.Science Tokyo, 2.RIKEN, 3.Tokyo Univ.)

Keywords:

MoS2,Superconductivity,VdW materials

Intercalation of guest ions into the van der Waals (vdW) gap of layered materials is a powerful route to create novel material phases and functionalities. Ionic gating is a technique to control the motions and configuration of ions, both for intercalation and surface electrostatic doping. The advance of ionic gating enables the in-situ probe of dynamics of ion diffusion, carrier doping and transport properties. Here we performed in-situ resistivity and Raman experiments on the potassium ion (K⁺) intercalation of single crystal MoS₂ and constructed a temperature-carrier density phase diagram. The K⁺-intercalation induces a structural transition from the prismatically coordinated phase to the octahedrally coordinated phase, where anisotropic three-dimensional superconductivity and possible charge density wave state were observed. The present ionic gating offers a comprehensive view of the intercalated phases and proves that the electrostatically induced superconductivity is distinct from that in the intercalated phase.