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Memristive phase switching in two-dimensional 1T-TaS2 crystals
Masaro Yoshida1, Ryuji Suzuki1, Yijin Zhang1
1Quantum-Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Science Advances
|November 25, 2015
Summary
Researchers achieved memristive phase switching in nano-thick tantalum disulfide (1T-TaS2) crystals. Thinning induced slow kinetics, enabling exploration of metastable states for novel nonvolatile memory applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) materials exhibit unique properties due to quantum confinement effects.
- Electron correlation effects are significantly altered in reduced dimensions.
- Few studies explore novel phenomena in correlated 2D crystals.
Purpose of the Study:
- Investigate memristive phase switching in nano-thick 1T-type tantalum disulfide (1T-TaS2) crystals.
- Explore the emergence of metastable states due to reduced thickness.
- Realize nonvolatile memory operation in correlated 2D systems.
Main Methods:
- Fabrication of nano-thick 1T-TaS2 crystals.
- Analysis of phase transition ordering kinetics as a function of thickness.
- Application of in-plane electric fields to induce memristive switching.
Main Results:
- Phase transition ordering kinetics become extremely slow in reduced thickness 1T-TaS2.
- Metastable states emerge due to slow kinetics.
- Unprecedented memristive switching to multistep nonvolatile states was achieved via in-plane electric fields.
Conclusions:
- Thickness reduction is crucial for achieving nonvolatile electrical switching in 1T-TaS2.
- Slowed kinetics stabilize metastable states, enabling nonvolatile memory.
- Correlated 2D crystals offer a novel platform for exploring and functionalizing metastable states.
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