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中国物理学会期刊

涡旋磁振子的拓扑物理、调控机制及应用研究进展

Twisted magnons: Topological physics, regulation mechanisms, and applications

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  • 磁振子是磁有序系统中量子化的自旋波集体激发, 因其在信息传输与处理过程中几乎不产生欧姆损耗, 被认为是低能耗自旋电子学器件的重要信息载体. 将内禀轨道角动量(orbital angular momentum, OAM)引入磁振子体系, 可赋予其除自旋角动量之外的额外自由度, 使传统磁振子转变为涡旋磁振子, 从而显著拓展磁振子体系的调控维度与功能空间. 本文系统综述了涡旋磁振子的基本物理特性、产生与探测方法, 以及其在信息处理和量子调控等领域的最新研究进展. 涡旋磁振子的产生主要可通过两种方式实现: 施加与传播方向垂直的径向电场进行激发; 利用磁螺旋相位板对磁振子波前进行相位调制. 其携带的OAM可借助自旋泵浦效应与逆自旋霍尔效应(ISHE)实现电学读出. 由于OAM本征值谱具有无界性, 相互正交的OAM态可用于构建高维量子比特, 为量子信息编码提供新的自由度. 进一步将OAM引入反铁磁体系, 则有望实现任意相移门、泡利门、Hadamard门等通用量子门操作, 并为构建任意量子电路提供潜在平台. 涡旋磁振子的这些特性为发展下一代高效、低功耗信息处理技术提供了新的物理机制与实现路径.

     

    Magnons, the quanta of spin-wave excitations in magnetically ordered systems, enable low-power information transmission and processing with negligible Joule heating, making them a promising platform for spintronic applications. Beyond their spin angular momentum, magnons can also possess a well-defined intrinsic orbital angular momentum (OAM), which provides an additional degree of freedom and transforms conventional magnons into twisted magnons. The topological charge associated with OAM can be externally tuned and is robust against magnetic damping, thereby greatly enhancing the dimensionality, controllability, and functional versatility of magnonic systems. In this review, we systematically discuss the fundamental physical properties of twisted magnons, their generation and detection methods, and recent advances in their applications.
    At present, two primary approaches have been proposed for generating twisted magnons: excitation by a radial electric field perpendicular to the propagation direction, and phase modulation using a magnetic spiral phase plate. In addition, coupling to an applied electric field through the Aharonov–Casher effect enables dynamic control of the topological charge. The OAM carried by twisted magnons can be electrically detected via spin pumping combined with the inverse spin Hall effect (ISHE). Owing to the unbounded spectrum of OAM eigenvalues, mutually orthogonal OAM states can be employed to construct high-dimensional qubits, offering a powerful new degree of freedom for quantum information encoding.
    Furthermore, by exploiting the lifting of chiral degeneracy in ferromagnetic nanodisks through dynamic dipolar interactions and/or interfacial Dzyaloshinskii–Moriya interactions, magnonic Bloch spheres can be precisely initialized, manipulated, and electrically detected. Extending OAM to antiferromagnetic systems further enables symmetry-protected logic-gate operations, including phase-shift gates, Pauli gates, square-root-of-NOT gates, and Hadamard gates. These capabilities are expected to facilitate the construction of arbitrary quantum circuits and support multiplexed data transfer. Taken together, the unique properties of twisted magnons open new avenues for next-generation ultrafast information-processing technologies with high fidelity and low energy consumption.

     

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