论文标题
非中心对称磁绝缘子中的太阳能电池的自旋形式
Spin-current version of solar cells in non-centrosymmetric magnetic insulators
论文作者
论文摘要
光伏效应，例如太阳能电池，将光转换为直流电流。该现象发生在各种设置中，例如在非中心对称晶体和半导体PN连接中。最近，我们提出了一种用于使用电磁波（即太阳能电池的自旋流动物）在磁铁中产生直流自旋电流的理论。我们的计算表明，在多种非中心磁体中，自旋电流的非线性电导率为非零，这意味着该现象在带有磁激励的反转 - 空气对称材料中无处不在。直觉上，这种现象是磁性激发的批量光伏效应，其中电子和孔，可见光和反转空气对称半导体分别被镁或蜘蛛网，THZ或GHz波以及不对称的磁绝缘子代替。我们还表明，光子驱动的自旋电流是移位电流类型，因此，电流在杂质散射上是稳定的。这种散装的光伏旋转电流与磁铁和金属之间的界面上发生的众所周知的自旋泵呈鲜明对比。
Photovoltaic effect, e.g., solar cells, converts light into DC electric current. This phenomenon takes place in various setups such as in noncentrosymmetric crystals and semiconductor pn junctions. Recently, we proposed a theory for producing DC spin current in magnets using electromagnetic waves, i.e., the spin-current counterpart of the solar cells. Our calculation shows that the nonlinear conductivity for the spin current is nonzero in a variety of noncentrosymmetric magnets, implying that the phenomenon is ubiquitous in inversion-asymmetric materials with magnetic excitations. Intuitively, this phenomenon is a bulk photovoltaic effect of magnetic excitations, where electrons and holes, visible light, and inversion-asymmetric semiconductors are replaced with magnons or spinons, THz or GHz waves, and asymmetric magnetic insulators, respectively. We also show that the photon-driven spin current is shift current type, and as a result, the current is stable against impurity scattering. This bulk photovoltaic spin current is in sharp contrast to that of well-known spin pumping that takes place at the interface between a magnet and a metal.
