特殊设计磁点中Laser诱导的自旋保护和开关：理论研究
Laser-induced spin protection and switching in a specially designed magnetic dot: A theoretical investigation
摘要：
大多数激光诱导飞秒磁性的研究都是在磁性薄膜中进行的。纳米结构的磁点，以其降低的维度，提供了新的机会，自旋操纵。我们预测，如果磁点在最低占据分子轨道（LUMO）和最高未占据分子轨道（HOMO）之间存在偶极禁戒跃迁，而在LUMO+1和HOMO之间存在偶极允许跃迁，那么电磁诱导透明可以用来防止超快激光诱导的自旋动量减少，或者说是自旋保护。这是通过强转储脉冲将布居漏斗到LUMO+1来实现的。如果泵浦脉冲和转储脉冲之间的时间延迟长于60 fs，则粒子数反转开始并且实现自旋切换。这些预测是可检测的实验。
英文摘要：
Most laser-induced femtosecond magnetism investigations are done in magnetic thin films. Nanostructured magnetic dots, with their reduced dimensionality, present new opportunities for spin manipulation. Here we predict that if a magnetic dot has a dipole-forbidden transition between the lowest occupied molecular orbital (LUMO) and the highest unoccupied molecular orbital (HOMO), but a dipole-allowed transition between LUMO+1 and HOMO, electromagnetically inducedtransparency can be used to prevent ultrafast laser-induced spin momentum reduction, or spin protection. This is realized through a strong dump pulse to funnel the population into LUMO+1. If the time delay between the pump and dump pulses is longer than 60 fs, a population inversion starts and spin switching is achieved. Thesepredictions are detectable experimentally.
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