articlePhysical Review LettersAug 23, 2016BRONZE OA

Ferroelectricity and Phase Transitions in Monolayer Group-IV Monochalcogenides

RFRuixiang FeiWKWei KangLYLi Yang

Washington University in St. Louis · Peking University

PubMed
Indexed inarxivcrossrefpubmed

Abstract

Ferroelectricity usually fades away as materials are thinned down below a critical value. We reveal that the unique ionic-potential anharmonicity can induce spontaneous in-plane electrical polarization and ferroelectricity in monolayer group-IV monochalcogenides MX (M=Ge, Sn; X=S, Se). An effective Hamiltonian has been successfully extracted from the parametrized energy space, making it possible to study the ferroelectric phase transitions in a single-atom layer. The ferroelectricity in these materials is found to be robust and the corresponding Curie temperatures are higher than room temperature, making them promising for realizing ultrathin ferroelectric devices of broad interest. We further provide the…

Citation impact

660
total citations
FWCI
23.70
Percentile
100%
References
55
Citations per year

Authors

3

Topics & keywords

Topics
Keywords
  • Ferroelectricity
  • Monolayer
  • Materials science
  • Condensed matter physics
  • Group (periodic table)
  • Phase transition
  • Phase (matter)
  • Crystallography
UN Sustainable Development Goals
  • Affordable and clean energy
No related works found for this paper.

Funding