摘要
涡旋磁振子是一类携带有受到拓扑保护的内禀轨道角动量的自旋波。磁性量子理论给出了二维圆形铁磁纳米量子点中涡旋磁振子的解析刻画,并定义了其轨道角动量。在低维铁磁系统中,退磁效应(偶极-偶极相互作用)的存在诱导涡旋磁振子产生能级退简并(能级劈裂),使得具有不同拓扑荷的本征模式形成二能级系统。在外加驱动的激发下,涡旋磁振子二能级系统会出现能级跃迁。这使得构建超高速低功耗拓扑量子NOT门成为可能。以上结果得到了微磁学模拟的确认。
Twisted magnons are spinwave quantas carrying intrinsic angular momentum protected by their topological properties.Quantum mechanical theory of magnetisim leads to analytical desctriptions and solutions for twisted magnons in 2-dimensional disk-shaped ferromagnetic quantum dots,which relates the intrinsic angular moment to their topological charges.In such systems,magnetic dipolar interaction induces a splitting in energy levels of twisted magnons with opposite topological charges,defining a quasi-particle two level system.State transitions appear when the system undergos exciting from applied dynamical forces,which paves a new way to a topological NOT gate with extreme rapid switch clock.All the results are confirmed with full-fledged Micro-magnetism simulations.
作者
陈敏
贾丽源
吴江
陈红良
蓝江河
肖礼康
张平川
刘庆元
李俊
CHEN Min;JIA Li-yuan;WU Jiang;CHEN Hong-liang;LAN Jiang-he;XIAO Li-kang;ZHANG Ping-chuan;LIU Qing-yuan;LI Jun(Ninth Institute,China Electronics Technology Group,Mianyang 621000,China)
出处
《磁性材料及器件》
CAS
2023年第3期1-9,共9页
Journal of Magnetic Materials and Devices
关键词
涡旋磁振子
拓扑
量子计算
轨道角动量
退磁效应
能级退简并
twisted magnon
topology
quantum computation
angular momentum
demagnetization
energy level degeneration