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Observation of room-temperature polar skyrmions

Abstract: Complex topological configurations are fertile ground for exploring emergent phenomena and exotic phases in condensed-matter physics. For example, the recent discovery of polarization vortices and their associated complex-phase coexistence and response under applied electric fields in superlattices of (PbTiO3)n/(SrTiO3)n suggests the presence of a complex, multi-dimensional system capable of interesting physical responses, such as chirality, negative capacitance and large piezo-electric responses. Here, by varying epitaxial constraints, we discover room-temperature polar-skyrmion bubbles in a lead titanate layer confined by strontium titanate layers, which are imaged by atomic-resolution scanning transmission electron microscopy. Phase-field modelling and second-principles calculations reveal that the polar-skyrmion bubbles have a skyrmion number of +1, and resonant soft-X-ray diffraction experiments show circular dichroism, confirming chirality. Such nanometre-scale polar-skyrmion bubbles are the electric analogues of magnetic skyrmions, and could contribute to the advancement of ferroelectrics towards functionalities incorporating emergent chirality and electrically controllable negative capacitance.

 Fuente: Nature volume 568, pages368-372(2019)

Editorial: Nature Publishing Group

 Fecha de publicación: 01/04/2019

Nº de páginas: 17

Tipo de publicación: Artículo de Revista

ISSN: 0028-0836,1476-4687

Proyecto español: FIS2015-64886-C5-2-P

Url de la publicación: https://doi.org/10.1038/s41586-019-1092-8

Autores/as

DAS, S.

TANG, Y.L.

HONG, Z.

GONÇALVEZ, M.A.P.

MCCARTER, M.R.

KLEWE, C.

NGUYEN, K.X.

SHAFER,P.

ARENHOLZ, E.

STOICA, V.A.

HSU, S-L.

WANG, B.

OPHUS, C.

LIU, J.F.

NELSON, C.T.

SAREMI, S.

PRASAD, B.

MEI, A.B.

SCHLOM, D.G.

ÍÑIGUEZ, J.

MULLER, D.A.

CHEN, L.Q.

RAMESH, R.