论文标题
掺杂石墨烯中未阻尼的谷化帕拉格农
Undamped inter-valley paramagnons in doped graphene
论文作者
论文摘要
我们预测了在顺磁制度中的掺杂石墨烯中未阻尼的集体自旋激发的存在，称为paramagnons。由于这种集体模式中涉及的电子和孔位于带结构的不同山谷中，因此这些谷化帕拉格农的动量是通过在动量空间中的山谷分离给出的。 valley paramagnons的能量位于掺杂石墨烯时出现的带间粒子间电子孔刺激的连续体下方的空隙区域。由于在该空隙区域缺乏电子孔激发，因此未阻碍了Parmagnons。它们的能量在很大程度上取决于掺杂浓度，这可以在将来的实验中识别它们。
We predict the existence of an undamped collective spin excitation in doped graphene in the paramagnetic regime, referred to as paramagnons. Since the electrons and the holes involved in this collective mode reside in different valleys of the band structure, the momentum of these inter-valley paramagnons is given by the separation of the valleys in momentum space. The energy of the inter-valley paramagnons lies in the void region below the continuum of inter-band single-particle electron-hole excitations that appears when graphene is doped. The paramagnons are undamped due to the lack of electron-hole excitations in this void region. Their energy strongly depends on doping concentration, which can help to identify them in future experiments.
