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Imaging Electric Polarization Switching in Multilayer Graphene.

Zhou Zhou1, Xiyao Peng1, Jianfeng Bi1

  • 1School of Physics, Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, and State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Researchers observed electric polarization switching in multilayer graphene using domain wall (DW) sliding. This novel finding in 2D sliding ferroelectricity opens new avenues for advanced electronic materials.

Keywords:
electric polarizationmultilayer graphenepolarization switchingscanning near‐field optical microscopy

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Emerging 2D sliding ferroelectricity is characterized by polarization switching via domain wall (DW) sliding.
  • Multilayer graphene is gaining attention for its tunable electron correlation and band topology.

Purpose of the Study:

  • To directly observe and realize domain wall sliding-induced electric polarization switching in multilayer graphene.
  • To investigate the mechanism behind polarization switching in tetralayer graphene.

Main Methods:

  • Utilized a gate-tunable nanoscale optical imaging technique to identify polar domains in tetralayer graphene.
  • Applied global and local electric fields and mechanical forces to induce and observe DW sliding.
  • Combined experimental observations with theoretical analysis.

Main Results:

  • Direct observation of electric polarization switching induced by DW sliding in multilayer graphene for the first time.
  • Identification of adjacent polar domains with opposite electric polarizations in tetralayer graphene.
  • Determination that a single DW sliding at the middlemost interface is responsible for polarization switching.

Conclusions:

  • Demonstrated domain wall sliding as a mechanism for polarization switching in multilayer graphene.
  • Established a novel optical readout method for sensitive detection of electric polarization in 2D materials.
  • Opened new opportunities for studying sliding ferroelectricity in graphene-based systems.