强关联巡游电子系统中的拉莫尔进动
Larmor precession in strongly correlated itinerant electron systems
AI总结：
本研究利用动力学平均场理论，结合沃德恒等式，研究了强关联巡游电子系统中磁场诱导的集体拉莫尔进动及其自旋波阻尼，为理解关联材料中的自旋动力学提供了新途径。
摘要：
多电子系统在磁场存在下会发生集体拉莫尔进动。在顺磁金属中，由此产生的自旋波为理解电子-电子相互作用产生的关联效应提供了洞察。在此，我们使用动力学平均场理论来研究强关联区域中的集体拉莫尔进动，在该区域中，准粒子寿命和非准粒子态等动力学关联效应至关重要。我们研究了自旋激发谱，其中包括色散的拉莫尔模式以及导致斯通纳阻尼的电子-空穴激发。我们还提取了慢自旋波的动量分辨阻尼。对这些现象的准确理论描述依赖于沃德恒等式，该恒等式保证了在长波长下自能修正和顶点修正的精确抵消。我们的发现为更好地理解关联材料中的自旋波阻尼铺平了道路。
英文摘要：
Many-electron systems undergo a collective Larmor precession in the presence of a magnetic field. In a paramagnetic metal, the resulting spin wave provides insight into the correlation effects generated by the electron-electron interaction. Here, we use dynamical mean-field theory to investigate the collective Larmor precession in the strongly correlated regime, where dynamical correlation effects such as quasiparticle lifetimes and non-quasiparticle states are essential. We study the spin excitation spectrum, which includes a dispersive Larmor mode as well as electron-hole excitations that lead to Stoner damping. We also extract the momentum-resolved damping of slow spin waves. The accurate theoretical description of these phenomena relies on the Ward identity, which guarantees a precise cancellation of self-energy and vertex corrections at long wavelengths. Our findings pave the way towards a better understanding of spin wave damping in correlated materials.
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