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Excitations of the ferroelectric order

Ping Tang1, Ryo Iguchi2, Ken-ichi Uchida2,3,4, and Gerrit E. W. Bauer1,3,4,5,6

  • 1WPI-AIMR, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • 2National Institute for Materials Science, Tsukuba 305-0047, Japan
  • 3Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
  • 4Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
  • 5Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands
  • 6Kavli Institute for Theoretical Sciences, University of the Chinese Academy of Sciences, Beijing 10090, China

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Phys. Rev. B 106, L081105 – Published 8 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L081105

Abstract

We identify the bosonic excitations in ferroelectrics that carry electric dipoles from the phenomenological Landau-Ginzburg-Devonshire theory. The “ferron” quasiparticles emerge from the concerted action of anharmonicity and broken inversion symmetry. In contrast to magnons, the transverse excitations of the magnetic order, the ferrons in displacive ferroelectrics are longitudinal with respect to the ferroelectric order. Based on the ferron spectrum, we predict temperature-dependent pyroelectric and electrocaloric properties, electric-field-tunable heat and polarization transport, and ferron-photon hybridization.

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Phys. Rev. B 106, L081105– Published 8 August, 2022
  • Received 13 March 2022
  • Revised 17 May 2022
  • Accepted 27 July 2022
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