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Hyperferroelectrics: proper ferroelectrics with persistent polarization.
- Source :
-
Physical review letters [Phys Rev Lett] 2014 Mar 28; Vol. 112 (12), pp. 127601. Date of Electronic Publication: 2014 Mar 26. - Publication Year :
- 2014
-
Abstract
- All known proper ferroelectrics are unable to polarize normal to a surface or interface if the resulting depolarization field is unscreened, but there is no fundamental principle that enforces this behavior. In this work, we introduce hyperferroelectrics, a new class of proper ferroelectrics which polarize even when the depolarization field is unscreened, this condition being equivalent to instability of a longitudinal optic mode in addition to the transverse-optic-mode instability characteristic of proper ferroelectrics. We use first-principles calculations to show that several recently discovered hexagonal ferroelectric semiconductors have this property, and we examine its consequences both in the bulk and in a superlattice geometry.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 112
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 24724680
- Full Text :
- https://doi.org/10.1103/PhysRevLett.112.127601