各向异性电子压力作用下金属内部的磁场
Magnetic field inside the metal induced by anisotropic electronic pressure
摘要：
我们从理论上表明，在分布各向同性的时间尺度上，激光辐照金属内部的电子分布函数的各向异性导致边缘电流的形成。当皮肤层中的电子压力为各向异性时，压力梯度表现为非势力，有效地产生低频磁场。在飞秒激光泵浦的典型实验中，在非破坏性相互作用状态下，产生的内部磁场可以增加到约1特斯拉的量级。我们证明，这个领域是本地化的金属内，而只有一小部分的能量可以辐射到自由空间作为一个亚太赫兹信号。
英文摘要：
We show theoretically that anisotropy of electronic distribution function inside the laser-irradiated metal leads to the formation of edge currents at the timescale of distribution isotropization. When the electronic pressure in the skin-layer is anisotropic, pressure gradient appears to be non-potential force effectively producing low-frequency magnetic field. In typical experiments with femtosecond laser pumping generated internal magnetic field can rich magnitude up to ~1 Tesla in non-damaging interaction regime. We demonstrate that this field is localized inside the metal, while just a minor part of its energy can be radiated into free space as a sub-terahertz signal.
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