The Einstein-de Haas (EdH) effect and its reciprocal the Barnett effect are fundamental to magnetism and uniquely yield measures of the ratio of magnetic moment to total angular momentum. These effects, small and generally difficult to observe, are enjoying a resurgence of interest as contemporary techniques enable new approaches to their study. The high mechanical resonance frequencies in nanomechanical systems offer a tremendous advantage for the observation of EdH torques in particular. At radio frequencies, the EdH effect can become comparable to or even exceed in magnitude conventional cross-product magnetic torques. In addition, the RF-EdH torque is expected to be phase-shifted by 90 degrees relative to cross-product torques, provided the magnetic system remains in quasi-static equilibrium, enabling separation in quadratures when both sources of torque are operative. Radio frequency EdH measurements are demonstrated through the full hysteresis range of micrometer scale, monocrystalline yttrium iron garnet (YIG) disks. Equilibrium behavior is observed in the vortex state at low bias field. Barkhausen-like features emerge in the in-plane EdH torque at higher fields in the vortex state, revealing magnetic disorder too weak to be visible through the in-plane cross-product torque. Beyond vortex annihilation, peaks arise in the EdH torque versus bias field, and these together with their phase signatures indicate additional utility of the Einstein-de Haas effect for the study of RF-driven spin dynamics.
Thermal Einstein-de Haas Effect Induced by Chiral Phonons in Carbon Nanotubes
Tokyo University of Science（东京科学大学）；National Institute of Advanced Industrial Science and Technology (AIST)（产业技术综合研究所）；RIST, Tokyo University of Science（东京科学大学 RIST）
Microfluidic Actuation by Einstein-de Haas Spin Torque
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences（中国科学院大学理论科学研究所）；CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences（中国科学院大学拓扑量子计算卓越创新中心）；Advanced Science Research Center, Japan Atomic Energy Agency（日本原子能机构先进科学研究中心）；RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所新兴物质科学研究中心）
Microwave-induced suppression of dissipative conductivity and its Shubnikov -- de Haas oscillations in two-dimensional electron systems: Effect of dynamic electron localization
GaAs delta-doped quantum wire superlattice characterization by quantum Hall effect and Shubnikov de Haas oscillations
通过量子阱超晶格（2D）中的受控位错滑移（原子锯方法）实现的量子线超晶格（1D）已经显示出磁声子振荡。这种效应已被用来研究这种系统的电子性质，并证明了量子特性的物理性质的线。通过冷却温度和使用高达35 T的脉冲磁场，我们观察到了量子霍尔效应（QHE）和Shubnikov de Haas（SdH）振荡的各种配置的磁场。由基场值导出的有效质量与由磁声子效应得到的有效质量是一致的。场的旋转会引起共振频率的变化，这是由于质量张量的改变，就像在（3D）电子气中一样。从QHE的观点来看，rho_yz中的平台相对于rho_zz最小值是退相的，这似乎与加宽的朗道能级的态密度最小值的退相有关。
