Observation of the Pinch-Off Effect during Electrostatically Gating the Metal-Insulator Transition

Takeaki Yajima, Akira Toriumi

Research output: Contribution to journalArticlepeer-review


Electrostatically controlling material phases has been a long-standing challenge. While it is partially achieved by electrostatic gating with ionic liquid, it often involves unintended chemical reactions. In this sense, it has recently attracted tremendous attention that a solid-state electrostatic gating is successfully applied to insulator-metal transition by using ultrahigh-permittivity gate dielectrics. However, the detailed characteristics of this new class of device are totally unknown. Here, systematic studies are performed on the three-terminal device using VO2 insulator-metal transition and TiO2 gate dielectrics, and for the first time the pinch-off effect in phase transition devices is observed, a clear sign of electrostatic gating. Furthermore, the increase in the drain voltage has a “catalytic effect” of drastically sharpening the gate-induced transition, demonstrating a 0.1 V gate control. The characteristics are simulated by a quasi-equilibrium model, providing the firm ground for electrical control of material phases with high speed and high resolution.

Original languageEnglish
JournalAdvanced Electronic Materials
Publication statusAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials


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