Journal
ADVANCED MATERIALS
Volume 34, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202202633
Keywords
2D ferroelectricity; phase diagrams; phase transitions; polymorphism; screening
Categories
Funding
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1701-01]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2020R1A2C2003377, NRF-2018M3D1A1058793, NRF-2021M3H4A1A03054856]
- National Research Foundation of Korea [2020R1A2C2003377] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study reports the atomic and electric manipulation of ferroelectric polymorphs in Mo1-xWxTe2, achieving tunable polar lattice structures and stable ferroelectricity at high temperatures. The ferroelectric switching in this atomically thin material can withstand high charge carrier densities.
Polymorphism allows the symmetry of the lattice and spatial charge distributions of atomically thin materials to be designed. While various polymorphs for superconducting, magnetic, and topological states have been extensively studied, polymorphic control is a challenge for robust ferroelectricity in atomically thin geometries. Here, the atomic and electric manipulation of ferroelectric polymorphs in Mo1-xWxTe2 is reported. Atomic manipulation for polymorphic control via chemical pressure (substituting tungsten for molybdenum atoms) and charge density modulation can realize tunable polar lattice structures and robust ferroelectricity up to T = 400 K with a constant coercive field in an atomically thin material. Owing to the effective inversion symmetry breaking, the ferroelectric switching withstands a charge carrier density of up to 1.1 x 10(13) cm(-2), developing an original diagram for ferroelectric switching in atomically thin materials.
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