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arXiv 2408.08683cond-mat.mtrl-sci
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手性声子在SrTiO$_3$中诱导的原子及原子间轨道磁化

Atomic and inter-atomic orbital magnetization induced in SrTiO$_3$ by chiral phonons

Sergei Urazhdin

AI总结:

本文通过最小分子轨道模型揭示SrTiO3中手性声子诱导瞬态磁化的两种电子机制,为超快磁化控制和轨道电子学源发展提供理论依据。

摘要:

最近在非磁性绝缘体SrTiO3中观测到由圆偏振铁电声子诱导的出乎意料的大瞬态磁化[Nature 628, 534 (2024)]。我们使用一个最小分子轨道模型来证明该效应存在两种电子贡献。原子轨道贡献来源于配位氧原子的手性运动对Ti轨道角动量的泵浦。额外的原子间贡献与氧原子周围的瞬态循环电流有关,从而通过电子动力学实现对声子的有效修饰。我们的模型所提供的见解可能有助于发展超快磁化控制和轨道电子学源。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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