阿哈罗诺夫 - 卡什效应诱导的电荷中性粒子电四极矩
Aharonov-Casher-induced electric quadrupole of charge-neutral particles
- Pohang University of Science and Technology（浦项科技大学）
- Center for Quantum Dynamics of Angular Momentum（角动量量子动力学中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究电荷中性粒子在固体中OAM的物理表现，通过AC效应使其与电场梯度耦合展现电四极矩，计算了两个磁系统中磁振子的AC - EQ，发现晶胞积分的AC - EQ分量与典型核电四极矩量级相当。
AI中文摘要：
对于带电粒子，其在固体中的轨道角动量（OAM）有直接的磁表现为轨道磁化。然而，对于电荷中性粒子，其在固体中OAM的物理表现尚不清楚。本文表明，携带磁矩的电荷中性粒子通过阿哈罗诺夫 - 卡什（AC）效应与电场梯度耦合，从而在晶体固体中表现出电四极矩。这种AC诱导的电四极矩（AC - EQ）包含标量、环形偶极子和简化四极子分量，分别与电场的散度、环量和剪切共轭。作为代表性例子，计算了两个磁系统中磁振子的AC - EQ。在铁磁烧绿石中，Dzyaloshinskii - Moriya相互作用（DMI）诱导出可观的AC - EQ，而在螺旋铁镓榴石中，即使没有DMI，AC - EQ也从螺旋自旋构型中出现。在这两个系统中，晶胞积分的AC - EQ分量达到与典型核电四极矩相当的量级。
英文摘要：
For charged particles, their orbital angular momentum (OAM) in solid have a direct magnetic manifestation as an orbital magnetization. For charge-neutral particles, however, the physical manifestation of the OAM in solid remains unclear. Here, we show that a charge-neutral particle carrying a magnetic moment couples to electric-field gradient through the Aharonov-Casher (AC) effect, thereby exhibiting the electric quadrupole in crystalline solids. This AC-induced electric quadrupole (AC-EQ) contains the scalar, toroidal dipole, and reduced quadrupole components, which are conjugate to the divergence, circulation, and shear of the electric field, respectively. As representative examples, we calculate the AC-EQ of magnons in two magnetic systems. In ferromagnetic pyrochlore, Dzyaloshinskii-Moriya interaction (DMI) induces a sizable AC-EQ, whereas in helical Fe langasite the AC-EQ emerges from the helical spin configuration even in the absence of DMI.
