论文标题
电压控制的高带宽Terahertz振荡器基于反铁磁铁
Voltage-Controlled High-Bandwidth Terahertz Oscillators Based On Antiferromagnets
论文作者
论文摘要
在Terahertz（THZ）制度中产生紧凑的电压控制频率发生器和传感器是一项重大的技术挑战。在这里，我们表明，具有kagome结构的非共线抗铁磁铁（NCAFM）通过电诱导的旋转轨道扭矩（SOT），其频率从0 Hz到THZ态度可调。通过得出有效的理论来研究自动振荡的启动，带宽和振幅，该理论捕获了反应性和耗散性SOT。我们发现，动力学很大程度上取决于基态的手性，一种手性具有刺激性的激发，而相反的手性则提供了无间隙的自我振荡。我们的结果表明，NCAFM提供了独特的THZ功能组件，这可能在填补THZ技术差距中发挥重要作用。
Producing compact voltage-controlled frequency generators and sensors operating in the terahertz (THz) regime represents a major technological challenge. Here, we show that noncollinear antiferromagnets (NCAFM) with kagome structure host gapless self-oscillations whose frequencies are tunable from 0 Hz to the THz regime via electrically induced spin-orbit torques (SOTs). The auto-oscillations' initiation, bandwidth, and amplitude are investigated by deriving an effective theory, which captures the reactive and dissipative SOTs. We find that the dynamics strongly depends on the ground state's chirality, with one chirality having gapped excitations, whereas the opposite chirality provides gapless self-oscillations. Our results reveal that NCAFMs offer unique THz functional components, which could play a significant role in filling the THz technology gap.
