论文标题
流体动力电子的自旋共振中的旋转粘度
Rotational viscosity in spin resonance of hydrodynamic electrons
论文作者
论文摘要
在新型的超色材料中，电子可以形成一种粘性流体，从而从具有明显缺陷密度的普通导体中的电子气体的动力学大不相同。这种电子流体的非平稳流量的形状与大对比动脉的血流交替流相似[J. R. Womersley，J。Physiol。 127，552（1955）]。旋转粘度效应负责电子旋转和流动不均匀性的动力学之间的互连。特别是，它通过作用于电子旋转的内部自旋轨道扭矩诱导电子的自旋极化。在这里，我们表明，放置在磁场中的电子流体中的这种效果会导致对AC样品阻抗的校正，该阻抗在电子的Larmor频率下具有共振。通过这种方式，通过电检测到的自旋共振，可以看到电子流体的Womersley流动，并可以测量旋转粘度。
In novel ultra-pure materials electrons can form a viscous fluid, which is fundamentally different by its dynamics from the electron gas in ordinary conductors with significant density of defects. The shape of the non-stationary flow of such electron fluid is similar to the alternating flow of blood in large-radius arteries [J. R. Womersley, J. Physiol. 127, 552 (1955)]. The rotational viscosity effect is responsible for interconnection between the dynamics of electron spins and flow inhomogeneities. In particular, it induces the spin polarization of electrons in a curled flow via an internal spin-orbit torque acting on electron spins. Here we show that this effect in an electron fluid placed in a magnetic field leads to a correction to the ac sample impedance, which has a resonance at the Larmor frequency of electrons. In this way, via the electrically detected spin resonance the Womersley flow of an electron fluid can be visualized and the rotational viscosity can be measured.
