Atomic and inter-atomic orbital magnetization induced in SrTiO₃ by chiral phonons

2024/08/16 by Sergei Urazhdin, Urazhdin, Sergei · 2 citations
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Optical and Acousto-Optic Technologies #Terahertz technology and applications

paper · pdf · doi:10.48550/arxiv.2408.08683

openalex publication_date 2024/08/16 · openalex created_date 2024/09/13 · openalex updated_date 2026/07/28

Abstract

An unexpectedly large transient magnetization induced by circularly polarized ferroelectric phonons was recently observed in a nonmagnetic insulator SrTiO3 [Nature 628, 534 (2024)]. We use a minimal molecular orbital model to demonstrate two electronic contributions to this effect. An atomic orbital contribution arises from the pumping of orbital angular momentum of Ti by chiral motion of coordinating oxygen atoms. An additional inter-atomic contribution is associated with the transient circulating current around the oxygen atoms, resulting in efficient dressing of phonons by electron dynamics. The insights provided by our model may facilitate the development of ultrafast magnetization control and orbitronic sources.

Cited by

• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons
• Thermal Hall effect induced by phonon skew-scattering via orbital magnetization

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