Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17137-0
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Funding
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- CIEE/Baltic-American Freedom Foundation
- European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant [778070]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division [DE-FG02-09ER46554]
- McMinn Endowment at Vanderbilt University
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- AFOSR (LRIR) [16RXCOR322]
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Polar van der Waals chalcogenophosphates exhibit unique properties, such as negative electrostriction and multi-well ferrielectricity, and enable combining dielectric and 2D electronic materials. Using low temperature piezoresponse force microscopy, we revealed coexistence of piezoelectric and non-piezoelectric phases in CuInP2Se6, forming unusual domain walls with enhanced piezoelectric response. From systematic imaging experiments we have inferred the formation of a partially polarized antiferroelectric state, with inclusions of structurally distinct ferrielectric domains enclosed by the corresponding phase boundaries. The assignment is strongly supported by optical spectroscopies and density-functionaltheory calculations. Enhanced piezoresponse at the ferrielectric/antiferroelectric phase boundary and the ability to manipulate this entity with electric field on the nanoscale expand the existing phenomenology of functional domain walls. At the same time, phase-coexistence in chalcogenophosphates may lead to rational strategies for incorporation of ferroic functionality into van der Waals heterostructures, with stronger resilience toward detrimental size-effects.
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