论文标题
平面频带系统中的复制带级联：扭曲双层石墨烯的预测
Cascade of replica bands in flat band systems: predictions for twisted bilayer graphene
论文作者
论文摘要
我们研究了电子 - 音波相互作用（EPI）对靠近费米水平和相对较大的声子能量量表的系统的影响。求解自一致的全带宽以Eliashberg方程式后，我们计算角度分辨的照片发射光谱和扫描隧道光谱/显微镜光谱。我们在正常和超导状态下获得了一系列Quasiparticle副本带，这些序列源自电子质量重新归化函数的频率依赖性特征。我们表明，这些复制带可用于从实验中提取相关的声子能量量表。我们特别关注扭曲的双层石墨烯，我们预测复制波段的形成，当观察到时，它将阐明EPI在该原型平坦频段系统中的作用。
We investigate the effect of electron-phonon interactions (EPI) in systems exhibiting one or more flat electron bands close to the Fermi level and a comparatively large phonon energy scale. After solving the self-consistent full-bandwidth Eliashberg equations, we compute Angular Resolved Photo Emission Spectroscopy and Scanning Tunneling Spectroscopy/Microscopy spectra. We obtain a sequence of quasiparticle replica bands in both the normal and superconducting states that originate from frequency dependent features of the electron mass renormalization function. We show that these replica bands can be used to extract the relevant phonon energy scale from experiments. Focusing in particular on twisted bilayer graphene, we predict replica-band formation which, when observed, will shed light on the role of EPI in this archetypal flat-band system.
