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Ferroelectric Phase Transition Driven by Switchable Covalent Bonds.

Han-Yue Zhang1, Nan Zhang1, Yao Zhang1

  • 1Jiangsu Key Laboratory for Biomaterials and Devices, State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China.

Physical Review Letters
|May 12, 2023
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Summary
This summary is machine-generated.

This study introduces a new mechanism for ferroelectric phase transitions using light-induced chemical bond changes in diarylethene crystals. This enables reversible, light-controlled polarization switching for advanced data storage and sensing applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Organic Chemistry

Background:

  • Ferroelectric phase transitions traditionally involve displacive or order-disorder mechanisms of internal components.
  • The role of chemical bond breaking and reformation in ferroelectricity has been largely unexplored.

Purpose of the Study:

  • To demonstrate a novel light-driven ferroelectric phase transition mechanism.
  • To utilize chemical bond rearrangement in diarylethene crystals for photocontrollable ferroelectricity.

Main Methods:

  • Employing diarylethene-based crystals capable of reversible photoisomerization.
  • Investigating light-induced changes in crystal structure and ferroelectric properties.
  • Characterizing the role of switchable covalent bonds in the phase transition.

Main Results:

  • Achieved light-driven mm2F1-type ferroelectric phase transition driven by covalent bond rearrangement.
  • Demonstrated reversible light-controllable ferroelectric polarization switching.
  • Observed dielectric and nonlinear optical bistability, confirming the ferroelectric nature.

Conclusions:

  • Proposes a new mechanism for ferroelectric phase transitions based on photochromic molecule bond dynamics.
  • Highlights the potential of diarylethene-based ferroelectrics for contactless, nondestructive photocontrolled data storage and sensing.