Ferroelectricity and Phase Transitions in Monolayer Group-IV Monochalcogenides
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Open Access
- 23 August 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 117 (9), 097601
- https://doi.org/10.1103/physrevlett.117.097601
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 (, Sn; , 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 phase diagram and predict other potentially two-dimensional ferroelectric materials.
Keywords
Funding Information
- National Science Foundation (DMR-1455346, EFRI-2DARE-1542815)
- Texas Advanced Computing Center
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