THz驱动的量子顺电体SrTiO3中的量子离子磁性

中文摘要 AI 辅助

晶体中旋转离子运动所携带的磁矩正逐渐被认识到对磁性、角动量输运和光学活性有重要贡献。然而，目前缺乏对其动态控制的有效方法。在此，我们报道了在量子顺电体SrTiO3中THz驱动的量子离子磁性的产生和光学检测。我们观察到振荡的离子磁化强度，而没有相应的振荡极化，这与经典关系M~PXdP/dt相矛盾，而其在该量子顺电区域以上的抑制则指向量子离子起源。分析表明，这种效应源于量子离子本征态之间的拍频，这些本征态的简并性因THz脉冲引起的方向对称性破缺而被解除。所提出的方法为量子材料中离子磁性的超快控制提供了一条途径，可用于自旋电子学和热电子学应用。

英文摘要

Magnetic moments carried by rotating ionic motion in crystals are becoming recognized as an important contribution to magnetism, angular momentum transport, and optical activity. However, efficient approaches to their dynamical control are lacking. Here, we report THz-driven generation and optical detection of quantum ionic magnetism in quantum paraelectric SrTiO3. We observe an oscillatory ionic magnetization without a corresponding oscillatory polarization, contradicting from the classical relation M~PXdP/dt while its suppression above the quantum paraelectric regime points to a quantum ionic origin. Analysis shows that this effect results from the beating between quantum ionic eigenstates whose degeneracy is lifted due to the directional symmetry breaking by the THz pulse. The presented approach provides a pathway for the ultrafast control of ionic magnetization in quantum materials for spintronic and thermotronic applications.

发表机构

• Massachusetts Institute of Technology（麻省理工学院）
• Emory University（埃默里大学）

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