Dynamically induced magnetism in KTaO3

Geilhufe, MatthiasStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.,Nordiska institutet för teoretisk fysik (Nordita) (author)

QC 20210628
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 T-1u 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.

Juricic, VladimirStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.;Univ Tecn Federico Santa Maria, Dept Fis, Casilla 110, Valparaiso, Chile.,Nordiska institutet för teoretisk fysik (Nordita),Universidad Técnica Federico Santa María, Chile(Swepub:su)vjuri (author)
Bonetti, StefanoStockholms universitet,Fysikum,Ca’ Foscari University of Venice, Italy(Swepub:su)sbone (author)
Zhu, Jian-XinLos Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA.;Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA. (author)
Balatsky, Alexander V.Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.;Univ Connecticut, Dept Phys, Storrs, CT 06269 USA.;Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA.,Nordiska institutet för teoretisk fysik (Nordita),University of Connecticut, USA(Swepub:su)abala (author)
KTHNordic Institute for Theoretical Physics NORDITA (creator_code:org_t)

By the author/editor: Geilhufe, Matthi ...; Juricic, Vladimi ...; Bonetti, Stefano; Zhu, Jian-Xin; Balatsky, Alexan ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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