Polar discontinuities, emergent conductivity, and critical twist-angledependent behaviour at wafer-bonded ferroelectric interfaces

Probing novel properties, arising from twisted interfaces, has traditionally relied on the stacking of exfoliated two-dimensional materials and the spontaneous formation of van der Waals bonds. So far, investigations involving intimate covalent or ionic bonds have not been a focus. Yet, we show here...

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Detalles Bibliográficos
Autores: Rogers, Andrew, Holsgrove, Kristina, Schafer, Nils A., Koppitz, Boris, Mccluskey, Conor J., Yedama, Shivani, Lynch, Ronan, Sloan, Keelan, Porter, Barry, Sykes, Adam, Catalan Daniels, Alex, Silva Jr, Romualdo S., Bruno, Flavio Yair, Seddon, Sam D., Lu, Haidong, Ruesing, Michael, Fink, Christa, Fahler-Muenzer, Philipp, Fearn, Sarah, Heutz, Sandrine E. M, Hadjimichael, Marios, Ramasse, Quentin M., Alexe, Marin, Kumar, Amit, Mcquaid, Raymond G. P., Gruverman, Alexei, Sanna, Simone, Eng, Lukas M, Gregg, J. Marty
Tipo de recurso: artículo
Fecha de publicación:2026
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/133839
Acceso en línea:https://hdl.handle.net/20.500.14352/133839
Access Level:acceso abierto
Palabra clave:538.9
Oxide Electronics
Ferroelectrics
LiNbO3
Física del estado sólido
Física de materiales
2211.14 Interfases
2211.11 Propiedades de Transporte de Electrones
2211 Física del Estado Sólido
Descripción
Sumario:Probing novel properties, arising from twisted interfaces, has traditionally relied on the stacking of exfoliated two-dimensional materials and the spontaneous formation of van der Waals bonds. So far, investigations involving intimate covalent or ionic bonds have not been a focus. Yet, we show here that an established technique, involving thermocompressional wafer bonding, works well for creating twisted non-van der Waals interfaces. We have successfully bonded z-cut lithium niobate single crystals to create ferroelectric oxide interfaces with strong polar discontinuities and have mapped the associated emergent interfacial conductivity. In some instances, a dramatic change in microstructure occurs, involving local dipolar switching. A twist-induced collapse in the capability of the system to effec8tively screen interfacial bound charge is implied. Importantly, this only occurs around specific moiré twist angles with sparse coincident lattices and associated short-range aperiodicity. In quasicrystals, aperiodicity is known to induce pseudo-bandgaps and we suspect a similar phenomenon here.

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