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  • Letter

Hidden phases with neuromorphic responses and highly enhanced piezoelectricity in an antiferroelectric prototype

Sergey Prosandeev1, Sergei Prokhorenko1, Yousra Nahas1, Yali Yang2, Changsong Xu1, Julie Grollier3, Diyar Talbayev4, Brahim Dkhil5, and L. Bellaiche1

  • 1Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA
  • 2International Centre for Quantum and Molecular Structures, Physics Department, Shanghai University, Shanghai 200444, China
  • 3Unité Mixte de Physique, Centre National de la Recherche Scientifique, Thales, Université Paris-Saclay, 91767 Palaiseau, France
  • 4Department of Physics and Engineering Physics, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA
  • 5Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupelec, Université Paris-Saclay, Centre National de la Recherche Scientifique UMR8580, 91190 Gif-sur-Yvette, France

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Phys. Rev. B 105, L100101 – Published 28 March, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L100101

Abstract

An atomistic first-principles-based effective Hamiltonian is used to study the response of a prototype of antiferroelectric materials, namely, the perovskite sodium niobate system, to the application of terahertz electric pulses. So-called hidden phases are discovered due to such ultrafast field excitation. These phases are homogeneous in nature, and correspond to local minima of energy. In addition to improved piezoelectric responses, they also possess controllable magnitude of the electric polarization, leading to possible applications of antiferroelectrics for ultrafast neuromorphic computing.

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Phys. Rev. B 105, L100101– Published 28 March, 2022
  • Received 29 March 2021
  • Accepted 10 March 2022
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