论文标题
真实空间BCS-BEC在FESE单层中
Real-space BCS-BEC crossover in FeSe monolayer
论文作者
论文摘要
BCS-BEC交叉状态中许多身体状态的量子具有持久的兴趣。在这里，我们通过使用空间分辨的扫描隧道光谱报告了在FESE单层薄膜中，在真实空间中BCS-BEC交叉的直接光谱证据。跨界车是由带状结构相对于费米水平的变化驱动的。基于两个波段模型的理论计算在整个跨界范围内质量重现了测得的光谱。另外，发现准粒子状态的Zeeman分裂与冷凝水的特征一致。我们的工作铺平了在原子尺度上以二维晶体材料中BCS-BEC交叉研究的外来状态的方式。
The quantum many body states in the BCS-BEC crossover regime are of long-lasting interest. Here we report direct spectroscopic evidence of BCS-BEC crossover in real-space in a FeSe monolayer thin film by using spatially resolved scanning tunneling spectra. The crossover is driven by the shift of band structure relative to the Fermi level. The theoretical calculation based on a two-band model qualitatively reproduces the measured spectra in the whole crossover range. In addition, the Zeeman splitting of the quasi-particle states is found to be consistent with the characteristics of a condensate. Our work paves the way to study the exotic states of BCS-BEC crossover in a two-dimensional crystalline material at the atomic scale.
