Topological states and quantum effects in magnonics

Abstract

In recent years, with the rapid development of the emerging technologies including the Internet of Things, cloud computing, big data, artificial intelligence and 5G, higher computing power is required. Traditional semiconductor devices are confronting the huge challenges brought by device miniaturization, energy consumption, heat dissipation, and so on. Moore.s law which succeeds in guiding downscaling and upgrading of microelectronics is nearing its end. A new information carrier is urgent need for information transmission and processing instead of electrons. Spin waves are collective excitations in ordered magnets and quantized as magnons. The propagation of magnons does not involve the electron motion and produces no Joule heating, which can overcome the increasing significant issue of heating dissipation in electronic devices. Thus, magnon-based devices have important application prospect in low-power information storage and computing. In this review, we first introduce the recent advances in the excitation, propagation, manipulation, detection of spin waves and magnon-based devices. Then, we mainly discussed the works from our group to inspire more possibilities in this area. This part is described from four aspects: (1) chiral magnonics, including the chiral propagarion of magnetostatic spin waves, DMI-induced nonreciprocity of spin waves, spin-wave propagation at chiral interface, magnonic Goos-Hänchen effect, spin-wave lens, and magnonic Stern-Gerlach effect; (2) nonlinear magnonics, including three-magnon processes induced by DMI and noncollinear magnetic textures, skyrmion-induced magnonic frequency comb, twisted magnon frequency and Penrose superradiance; (3) topological magnonics, including magnon Hall effect, magnonic topological insulator, magnonic topological semimetal, topological edge states and highorder corner states of magnetic solitons arranged in different crystal lattices; (4) quantum magnonics, including quantum states of magnon, magnon-based hybrid quantum systems, and cavity magnonics. Finally, the future development and prospect of magnonics are analyzed and discussed.

Modulation of topological phase transition and topological quantum state of magnon-photon in one-dimensional coupled cavity lattices

“…系统不仅对量子力学的基本原理进行了验证, 而且 可以构建各种微型光量子器件、量子信息处理平 台. 近年来, 腔QED 产生了一个新的分支, 即腔磁 力 学 系 统 [29][30][31] , 基 于 磁 子 (yttrium iron garnet, YIG)与微波腔光子的共振耦合形成杂化态-磁光 极化子(magnon-polariton), 其中磁子具有独特的 优势, 例如丰富的磁性非线性、低阻尼率和高自旋 密度 [32] . 通过磁偶极与微波光子相互作用, 耦合强 度可达到超强耦合, 为研究强耦合的物理效应提供 新平台 [33,34] .…”

“…最近的相关文献又研究了有许多有趣 的现象, 如磁子暗模 [35] 、高阶磁性例外点 [36] 、PT-对称 [37] 、双稳态 [38] 、磁-光-声纠缠 [39] . 因此, 受上述 文献的启发 [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] 可以改写为…”