Local negative permittivity and topological phase transition in polar skyrmions [* Cross-Reference *]

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Das, S.; Hong, Z.; Stoica, V. A.; Gonçalves, M. A.P.; Shao, Y. T.; Parsonnet, E.; Marksz, E. J.; Saremi, S.; McCarter, M. R.; Reynoso, A.; Long, C. J.; Hagerstrom, A. M.; Meyers, D.; Ravi, V.; Prasad, B.; Zhou, H.; Zhang, Z.; Wen, H.; Gómez-Ortiz, F.; García-Fernández, P.; Bokor, J.; Íñiguez, J.; Freeland, J. W.; Orloff, N. D.; Junquera, J.; Chen, L. Q.; Salahuddin, S.; Muller, D. A.; Martin, L. W.; Ramesh, R., 2026, "Local negative permittivity and topological phase transition in polar skyrmions [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.03QYPG, LIST Open Repository, V1

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Description	Topological solitons such as magnetic skyrmions have drawn attention as stable quasi-particle-like objects. The recent discovery of polar vortices and skyrmions in ferroelectric oxide superlattices has opened up new vistas to explore topology, emergent phenomena and approaches for manipulating such features with electric fields. Using macroscopic dielectric measurements, coupled with direct scanning convergent beam electron diffraction imaging on the atomic scale, theoretical phase-field simulations and second-principles calculations, we demonstrate that polar skyrmions in (PbTiO3)n/(SrTiO3)n superlattices are distinguished by a sheath of negative permittivity at the periphery of each skyrmion. This enhances the effective dielectric permittivity compared with the individual SrTiO3 and PbTiO3 layers. Moreover, the response of these topologically protected structures to electric field and temperature shows a reversible phase transition from the skyrmion state to a trivial uniform ferroelectric state, accompanied by large tunability of the dielectric permittivity. Pulsed switching measurements show a time-dependent evolution and recovery of the skyrmion state (and macroscopic dielectric response). The interrelationship between topological and dielectric properties presents an opportunity to simultaneously manipulate both by a single, and easily controlled, stimulus, the applied electric field. (2021-02-01) *This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1038/s41563-020-00818-y for the original and latest version of the dataset and data downloads* (2026-06-12)
Subject	Physics
Keyword	inf, attention as stable, drawn attention, magnetic skyrmions, dielectric
License/Data Use Agreement	Custom Dataset Terms


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Persistent Identifier	perma:LIST.03QYPG
Publication Date	2026-07-06
Title	Local negative permittivity and topological phase transition in polar skyrmions [* Cross-Reference *]
Other Identifier	https://doi.org/10.1038/s41563-020-00818-y SCOPUS_ID:85092336918
Author	Das, S. (Department of Materials Science and Engineering, University of California, Berkeley) - ORCID: 0000-0001-9823-0207 Hong, Z. (Pennsylvania State University, College of Engineering) Stoica, V. A. (Pennsylvania State University) - ORCID: 0000-0002-2734-7819 Gonçalves, M. A.P. (Luxembourg Institute of Science and Technology, Universidad de Cantabria, University of Luxembourg) Shao, Y. T. (Cornell University College of Engineering) Parsonnet, E. (University of California, Berkeley) - ORCID: 0000-0003-0723-6887 Marksz, E. J. (National Institute of Standards and Technology) Saremi, S. (Department of Materials Science and Engineering) - ORCID: 0000-0002-1625-8036 McCarter, M. R. (University of California, Berkeley) Reynoso, A. (University of California, Berkeley) Long, C. J. (National Institute of Standards and Technology) Hagerstrom, A. M. (National Institute of Standards and Technology) Meyers, D. (Department of Materials Science and Engineering) - ORCID: 0000-0003-4164-5131 Ravi, V. (Department of Materials Science and Engineering) - ORCID: 0000-0002-1195-1341 Prasad, B. (Department of Materials Science and Engineering) Zhou, H. (The Advanced Photon Source) - ORCID: 0000-0001-9642-8674 Zhang, Z. (The Advanced Photon Source) - ORCID: 0000-0002-7618-6134 Wen, H. (The Advanced Photon Source) - ORCID: 0000-0002-5427-175X Gómez-Ortiz, F. (Universidad de Cantabria) - ORCID: 0000-0002-7203-8476 García-Fernández, P. (Universidad de Cantabria) Bokor, J. (Department of Electrical Engineering and Computer Sciences) - ORCID: 0000-0002-4541-0156 Íñiguez, J. (Luxembourg Institute of Science and Technology, University of Luxembourg) - ORCID: 0000-0001-6435-3604 Freeland, J. W. (The Advanced Photon Source) - ORCID: 0000-0003-4814-5308 Orloff, N. D. (National Institute of Standards and Technology) Junquera, J. (Universidad de Cantabria) - ORCID: 0000-0002-9957-8982 Chen, L. Q. (Pennsylvania State University) - ORCID: 0000-0003-3359-3781 Salahuddin, S. (Department of Electrical Engineering and Computer Sciences) Muller, D. A. (Cornell University College of Engineering, Kavli Institute at Cornell for NanoScale Science) - ORCID: 0000-0003-4129-0473 Martin, L. W. (Department of Materials Science and Engineering, Lawrence Berkeley National Laboratory) - ORCID: 0000-0003-1889-2513 Ramesh, R. (Department of Materials Science and Engineering, University of California, Berkeley, Lawrence Berkeley National Laboratory) - ORCID: 0000-0003-0524-1332
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Description	Topological solitons such as magnetic skyrmions have drawn attention as stable quasi-particle-like objects. The recent discovery of polar vortices and skyrmions in ferroelectric oxide superlattices has opened up new vistas to explore topology, emergent phenomena and approaches for manipulating such features with electric fields. Using macroscopic dielectric measurements, coupled with direct scanning convergent beam electron diffraction imaging on the atomic scale, theoretical phase-field simulations and second-principles calculations, we demonstrate that polar skyrmions in (PbTiO3)n/(SrTiO3)n superlattices are distinguished by a sheath of negative permittivity at the periphery of each skyrmion. This enhances the effective dielectric permittivity compared with the individual SrTiO3 and PbTiO3 layers. Moreover, the response of these topologically protected structures to electric field and temperature shows a reversible phase transition from the skyrmion state to a trivial uniform ferroelectric state, accompanied by large tunability of the dielectric permittivity. Pulsed switching measurements show a time-dependent evolution and recovery of the skyrmion state (and macroscopic dielectric response). The interrelationship between topological and dielectric properties presents an opportunity to simultaneously manipulate both by a single, and easily controlled, stimulus, the applied electric field. (2021-02-01) *This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1038/s41563-020-00818-y for the original and latest version of the dataset and data downloads* (2026-06-12)
Subject	Physics
Keyword	inf attention as stable drawn attention magnetic skyrmions dielectric
Funding Information	National Science Foundation: ACI-1548562
Deposit Date	2021-02-01
Data Type	Article
Data Source	Nature Materials; ISSN: 14761122, eISSN: 14764660, vol. 20, n° 2, pp. 194-201

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