Terahertz electric-field-driven dynamical multiferroicity in SrTiO3

物理 凝聚态物理 声子 磁化 磁性 电场 太赫兹辐射 磁化动力学 极化密度 磁场 量子力学
作者
Martina Basini,Matteo Pancaldi,Björn Wehinger,Mattia Udina,Vivek Unikandanunni,Terumasa Tadano,Matthias C. Hoffmann,A. V. Balatsky,Stefano Bonetti
出处
期刊:Nature [Nature Portfolio]
卷期号:628 (8008): 534-539 被引量:25
标识
DOI:10.1038/s41586-024-07175-9
摘要

Abstract The emergence of collective order in matter is among the most fundamental and intriguing phenomena in physics. In recent years, the dynamical control and creation of novel ordered states of matter not accessible in thermodynamic equilibrium is receiving much attention 1–6 . The theoretical concept of dynamical multiferroicity has been introduced to describe the emergence of magnetization due to time-dependent electric polarization in non-ferromagnetic materials 7,8 . In simple terms, the coherent rotating motion of the ions in a crystal induces a magnetic moment along the axis of rotation. Here we provide experimental evidence of room-temperature magnetization in the archetypal paraelectric perovskite SrTiO 3 due to this mechanism. We resonantly drive the infrared-active soft phonon mode with an intense circularly polarized terahertz electric field and detect the time-resolved magneto-optical Kerr effect. A simple model, which includes two coupled nonlinear oscillators whose forces and couplings are derived with ab initio calculations using self-consistent phonon theory at a finite temperature 9 , reproduces qualitatively our experimental observations. A quantitatively correct magnitude was obtained for the effect by also considering the phonon analogue of the reciprocal of the Einstein–de Haas effect, which is also called the Barnett effect, in which the total angular momentum from the phonon order is transferred to the electronic one. Our findings show a new path for the control of magnetism, for example, for ultrafast magnetic switches, by coherently controlling the lattice vibrations with light.
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