Phase competition and negative piezoelectricity in interlayer-sliding ferroelectric ZrI2

  title={Phase competition and negative piezoelectricity in interlayer-sliding ferroelectric 
  author={Ning Ding and Jun Chen and Churen Gui and Haipeng You and Xiao-yan Yao and Shuai Dong},
  journal={Physical Review Materials},
  • N. DingJun Chen S. Dong
  • Published 3 August 2021
  • Physics, Materials Science
  • Physical Review Materials
The so-called interlayer-sliding ferroelectricity was recently proposed as an unconventional route to pursuit electric polarity in van der Waals multi-layers, which was already experimentally confirmed in WTe2 bilayer even though it is metallic. Very recently, another van der Waals system, i.e., the ZrI2 bilayer, was predicted to exhibit the interlayer-sliding ferroelectricity with both in-plane and out-of-plane polarizations [Phys. Rev. B 103, 165420 (2021)]. Here the ZrI2 bulk is studied… 

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