Theory of Generation and Conversion of Phonon Angular Momentum
Theory of Generation and Conversion of Phonon Angular Momentum
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DOI：
10.1007/978-981-33-4690-1
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
M. Hamada
中科院分区：
文献类型：
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作者：
M. Hamada
本书介绍了晶体中声子角动量的产生和转换的理论研究。最近，晶体中晶格振动（即声子）的旋转运动引起了人们的广泛关注。因此，本书根据模型计算和第一原理计算，从理论上证明了具有旋转运动的声子的产生。在没有反演对称性的系统中，声子角动量被证明是由温度梯度引起的，这在纤锌矿氮化镓、碲和硒等晶体中使用第一原理计算得到了证明。在既没有时间反转也没有反转对称的系统中，声子角动量被证明是由电场产生的。其次，本书介绍了作者和他的合作者开发的关于原子核的微观旋转如何与电子自旋耦合的微观机制。这些预测可以作为声子或机械运动的自旋电子学的构建模块。
This book presents a theoretical study of the generation and conversion of phonon angular momentum in crystals. Recently, rotational motions of lattice vibrations, ie, phonons, in crystals attract considerable attentions. As such, the book theoretically demonstrate generations of phonons with rotational motions, based on model calculations and first-principle calculations. In systems without inversion symmetry, the phonon angular momentum is shown to be caused by the temperature gradient, which is demonstrated in crystals such as wurtzite gallium nitride, tellurium, and selenium using the first-principle calculations. In systems with neither time-reversal nor inversion symmetries, the phonon angular momentum is shown to be generated by an electric field. Secondly, the book presents the microscopic mechanisms developed by the author and his collaborator on how these microscopic rotations of nuclei are coupled with electron spins. These predictions serve as building blocks for spintronics with phonons or mechanical motions.