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  • Letter
  • Open Access

Dynamically induced magnetism in KTaO3

R. Matthias Geilhufe1, Vladimir Juričić1,2, Stefano Bonetti3,4, Jian-Xin Zhu5, and Alexander V. Balatsky1,6

  • 1Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden
  • 2Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110, Valparaíso, Chile
  • 3Department of Physics, Stockholm University, 10691 Stockholm, Sweden
  • 4Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venice, Italy
  • 5Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 6Department of Physics and Institute for Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA

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Phys. Rev. Research 3, L022011 – Published 10 May, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L022011

Abstract

Dynamical multiferroicity features entangled dynamic orders: fluctuating electric dipoles induce magnetization. Hence, the material with paraelectric fluctuations can develop magnetic signatures if dynamically driven. We identify the paraelectric KTaO3 (KTO) as a prime candidate for the observation of the dynamical multiferroicity. We show that when a KTO sample is exposed to a circularly polarized laser pulse, the dynamically induced ionic magnetic moments are of the order of 5% of the nuclear magneton per unit cell. We determine the phonon spectrum using ab initio methods, and we identify T1u as relevant phonon modes that couple to the external field and induce magnetic polarization. We also predict a corresponding electron effect for the dynamically induced magnetic moment, which is enhanced by several orders of magnitude due to the significant mass difference between electron and ionic nucleus.

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Phys. Rev. Research 3, L022011– Published 10 May, 2021
  • Received 12 March 2021
  • Revised 9 April 2021
  • Accepted 14 April 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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