Principles of spintronic THz emitters
Principles of spintronic THz emitters
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DOI：
10.1063/5.0057536
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发表时间：
2021-08
影响因子：
3.2
通讯作者：
Wei-Peng Wu;Charles Yaw Ameyaw;M. Doty;M. Jungfleisch
中科院分区：
文献类型：
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作者：
Wei-Peng Wu;Charles Yaw Ameyaw;M. Doty;M. Jungfleisch
在回答关于电子、自旋和声子之间如何以及更重要的是在什么时间尺度上在固态材料中发生相互作用的基本问题方面已经取得了重大进展。这些复杂的相互作用导致了太赫兹(THz)自旋电子学的第一次真正应用：THz发射器可以与传统的THz源竞争，并提供通过自旋自由度实现的额外功能。本教程文章旨在提供了解、使用和改进太赫兹自旋电子发射器所需的背景知识。一个特别的焦点是介绍自旋电子太赫兹发射器运行的物理效应。这些效应在很大程度上是通过传统的自旋输运和自旋电子研究首次发现的。因此，我们首先回顾了在过去25年中发展起来的超快自旋物理的历史背景和当前的理论理解。然后，我们讨论用于表征自旋电子太赫兹发射体的标准实验技术，以及更广泛地说，超快磁现象。接下来，我们将介绍各种类型的自旋电子太赫兹发射体的合成原理和方法。最后，我们综述了这一令人兴奋的领域的最新进展，包括新型材料平台的集成，如拓扑绝缘体、反铁磁体和具有非传统自旋织构的材料。
Significant progress has been made in answering fundamental questions about how and, more importantly, on what time scales interactions between electrons, spins, and phonons occur in solid state materials. These complex interactions are leading to the first real applications of terahertz (THz) spintronics: THz emitters that can compete with traditional THz sources and provide additional functionalities enabled by the spin degree of freedom. This tutorial article is intended to provide the background necessary to understand, use, and improve THz spintronic emitters. A particular focus is the introduction of the physical effects that underlie the operation of spintronic THz emitters. These effects were, for the most part, first discovered through traditional spin-transport and spintronic studies. We therefore begin with a review of the historical background and current theoretical understanding of ultrafast spin physics that has been developed over the past twenty-five years. We then discuss standard experimental techniques for the characterization of spintronic THz emitters and – more broadly – ultrafast magnetic phenomena. We next present the principles and methods of the synthesis and fabrication of various types of spintronic THz emitters. Finally, we review recent developments in this exciting field including the integration of novel material platforms such as topological insulators as well as antiferromagnets and materials with unconventional spin textures.