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Superconductivity Series in Transition Metal Dichalcogenides by Ionic Gating
Wu Shi1, Jianting Ye2, Yijin Zhang1
1Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Scientific Reports
|August 4, 2015
Summary
Superconductivity was induced in MoSe2, MoTe2, and WS2 using novel ionic gating methods. This research expands the family of two-dimensional (2D) crystal superconductors and develops new gating techniques.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Two-dimensional (2D) crystals, specifically semiconducting transition metal dichalcogenides (TMDs), exhibit diverse functionalities beyond basic electronics.
- Superconductivity in TMDs remains underexplored due to challenges in inducing and studying this phenomenon across different TMD species.
Purpose of the Study:
- To systematically investigate superconductivity in MoSe2, MoTe2, and WS2 using various ionic gating techniques.
- To overcome methodological difficulties in accessing and inducing superconductivity in a wider range of TMD materials.
- To develop and validate novel ionic gating strategies for exploring superconductivity in 2D materials.
Main Methods:
- Employing electrostatic gating with ionic liquids to attempt superconductivity induction in MoSe2 and MoTe2.
- Utilizing an alternative gating method with KClO4/polyethylene glycol to achieve a transition from surface to bulk doping.
- Electrochemical induction of superconductivity in MoTe2 and WS2.
Main Results:
- Ionic liquid gating successfully induced superconductivity in MoSe2 but was limited in MoTe2 due to band alignment issues affecting electron accumulation.
- The KClO4/polyethylene glycol gating method enabled electrochemical induction of superconductivity in both MoTe2 and WS2.
- This study successfully expanded the known family of two-dimensional (2D) crystal superconductors.
Conclusions:
- Ionic gating is a viable method for inducing superconductivity in TMDs, with specific techniques tailored to material properties.
- The findings demonstrate a critical methodology for expanding the application of ionic gating to discover superconductivity in other advanced materials.
- This work significantly enriches the field of 2D superconductors and provides pathways for future research.
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