非传统补偿型半导体反铁磁体中波长敏感磁振子的超快动力学
Ultrafast dynamics of wavelength-sensitive magnons in unconventional compensated semiconducting antiferromagnet
AI总结：
本研究利用时间分辨二次磁光Kerr效应，在α-MnTe中揭示与探测波长相关的磁振子超快动力学，并以电子-声子-磁振子能量转移模型解释其机制。
摘要：
反铁磁体凭借其超快动力学和自发的零杂散场，成为下一代自旋电子器件的有力候选者。然而，由于控制和探测被淬灭的净磁化强度存在挑战，人们对其超快自旋行为仍缺乏认识。非传统补偿型半导体反铁磁体表现出强烈的时间反演对称性破缺、动量空间中的自旋劈裂，以及适合光学控制和探测的带隙，因此是揭示反铁磁体超快动力学的强大平台。在这里，我们通过时间分辨二次磁光Kerr效应测量，展示了非传统补偿型半导体反铁磁体α-MnTe中奇特的波长依赖自旋动力学，其中激光的探测光子能量与其带隙相匹配。这种对不同磁振子模式的直接激发和探测，揭示了宽温度范围内变化的自旋行为和时间特征。其源于电子结构不同能带中被触发的自旋，并由电子、声子和磁振子之间的能量转移模型加以描述。我们对这种非传统半导体反铁磁体奇特光学性质的研究，填补了时域自旋演化信息的缺失，并为其在超快自旋电子器件中的应用铺平了道路。
英文摘要：
Antiferromagnet is a promising candidate for the next generation spintronic devices, benefiting from its ultrafast dynamics and spontaneous zero stray field. However, the understanding of their ultrafast spin behaviors is lacking due to the challenges of controlling/detecting the quenched net magnetization. Unconventional compensated semiconducting antiferromagnets present strong time-reversal symmetry breaking, spin splitting in the momentum space, and suitable bandgap for optical control/detection. Thus, it is a powerful platform to uncover the ultrafast dynamics of antiferromagnets. Here, we show an exotic wavelength-dependent spin dynamic in the unconventional compensated semiconducting antiferromagnet α-MnTe via time-resolved quadratic magneto-optical Kerr effect measurement, where the probing photon energy of the laser matches its bandgap. This direct excitation and detection of distinct magnon modes reveal varying spin behaviors and time characteristics in a broad temperature range. It originates from the spins triggered at different bands of electronic structures and is depicted in an energy transfer model among electrons, phonons, and magnons. Our study of exotic optical properties in this unconventional semiconducting antiferromagnet fulfills the missing information of spin evolution in the time domain and paves the way for its utilization in ultrafast spintronic devices.
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