磁子学中的拓扑物态与量子效应

Topological states and quantum effects in magnonics

近年来,随着物联网、云计算、大数据以及人工智能等新兴技术的快速发展,人们对计算能力的要求越来越高.传统半导体器件在小型化、节能和散热等方面面临着巨大的挑战,因此亟需寻找一种全新的信息载体代替电子进行信息传输与处理.自旋波是磁矩进动的集体激发,其量子化的准粒子称为磁子.磁子的传播不依赖于传导电子的运动,因此不会产生焦耳热,能够克服日益显著的器件发热问题,因此磁子器件在低功耗信息存储与计算领域具有重要的应用前景.本文介绍磁子学近年来的一些重要研究进展,主要包括自旋波的手性传播,自旋波与磁孤子非线性散射导致的磁子频率梳,磁孤子的拓扑边界态和高阶角态,以及磁子量子态、基于磁子的混合量子体系和腔磁子学.最后,对磁子学的未来发展趋势及其前景进行分析与展望.

In recent years,with the rapid development of the emerging technologies including the internet of things,cloud computing,big data,and artificial intelligence,higher computing capability is required.Traditional semiconductor devices are confronting huge challenges brought by device miniaturization,energy consumption,heat dissipation,etc.Moore’s law which succeeds in guiding downscaling and upgrading of microelectronics is nearing its end.A new information carrier,instead of electrons,is required urgently for information transmission and processing.Spin waves are collectively excited waves in ordered magnets,and the quantized quasi particle is referred to as magnon.The propagation of magnons does not involve electron motion and produces no Joule heating,which can solve the increasing significant issues of heating dissipation in electronic devices.Thus,magnon-based devices have important application prospects 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 discuss the researches of our group.This part is described from four aspects:1)Chiral magnonics,including the chiral propagarion of magnetostatic spin waves,Dzyaloshinskii-Moriya interact ion(D MI)-induced nonreciprocity of spin waves,spinwave propagation at chiral interface,magnonic Goos-H?nchen effect,spin-wave lens,and magnonic SternGerlach effect;2)nonlinear magnonics,including three-magnon processes induced by DMI and noncollinear magnetic textures,skyrmion-induced magnonic frequency comb,twisted magnon frequency comb,and Penrose superradiance;3)topological magnonics,including magnon Hall effect,magnonic topological insulator,magnonic topological semimetal,topological edge states and high-order 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.