Interlayer Coupling Controlled Ordering and Phases in Polar Vortex Superlattices

Peter Meisenheimer, Arundhati Ghosal, Eric Hoglund, Zhiyang Wang, Piush Behera, Fernando Gómez-Ortiz, Pravin Kavle, Evguenia Karapetrova, Pablo García-Fernández, Lane W. Martin, Archana Raja, Long Qing Chen, Patrick E. Hopkins, Javier Junquera, Ramamoorthy Ramesh

Research output: Contribution to journalArticlepeer-review

Abstract

The recent discovery of polar topological structures has opened the door for exciting physics and emergent properties. There is, however, little methodology to engineer stability and ordering in these systems, properties of interest for engineering emergent functionalities. Notably, when the surface area is extended to arbitrary thicknesses, the topological polar texture becomes unstable. Here we show that this instability of the phase is due to electrical coupling between successive layers. We demonstrate that this electrical coupling is indicative of an effective screening length in the dielectric, similar to the conductor−ferroelectric interface. Controlling the electrostatics of the superlattice interfaces, the system can be tuned between a pure topological vortex state and a mixed classical-topological phase. This coupling also enables engineering coherency among the vortices, not only tuning the bulk phase diagram but also enabling the emergence of a 3D lattice of polar textures.

Original languageEnglish (US)
Pages (from-to)2972-2979
Number of pages8
JournalNano letters
Volume24
Issue number10
DOIs
StatePublished - Mar 13 2024

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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