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arXiv 2104.11089physics.chem-phcond-mat.other
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非共线磁性分子中非绝热效应引起的内禀振动angular momentum

Intrinsic vibrational angular momentum from non-adiabatic effects in non-collinear magnetic molecules

Oliviero Bistoni, Francesco Mauri, Matteo Calandra

摘要:

我们表明,在非共线磁性分子,非绝热(动力学)的影响,由于电子振动子耦合的时间反演对称性破缺相互作用的振动场。由于在这些系统中,电子波函数不能选择为实数,因此出现了非零的几何矢势(Berry连接)。其结果是,一个内在的非零振动角动量发生,即使是非简并模式和外部探针的情况下。电子振动模式可以被看作是携带相当大的角动量的基本量子粒子。作为一个概念的证明,我们证明了这种拓扑效应的幅度进行非绝热第一性原理计算铂簇,并显示这些分子主机相当大的固有声子角动量的轨道电子的巡回铁磁体。

英文摘要:

We show that in non-collinear magnetic molecules, non-adiabatic (dynamical) effects due to the electron-vibron coupling are time-reversal symmetry breaking interactions for the vibrational field. As in these systems the electronic wavefunction can not be chosen as real, a nonzero geometric vector potential (Berry connection) arises. As a result, an intrinsic nonzero vibrational angular momentum occurs even for non-degenerate modes and in the absence of external probes. The vibronic modes can then be seen as elementary quantum particles carrying a sizeable angular momentum. As a proof of concept, we demonstrate the magnitude of this topological effect by performing non-adiabatic first principles calculations on platinum clusters and by showing that these molecules host sizeable intrinsic phonon angular momenta comparable to the orbital electronic ones in itinerant ferromagnets.

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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