Photoemission Study of a Strongly Coupled Electron-Phonon System
Photoemission Study of a Strongly Coupled Electron-Phonon System
复制标题
DOI：
10.1103/physrevlett.83.592
复制
发表时间：
1999-07
影响因子：
8.6
通讯作者：
M. Hengsberger;D. Purdie;P. Segovia;M. Garnier;Y. Baer
中科院分区：
文献类型：
--
作者：
M. Hengsberger;D. Purdie;P. Segovia;M. Garnier;Y. Baer
我们给出了Be(0001)表面态的高分辨光电子能谱实验。在费米波矢附近的谱函数显示，由于与表面声子模的耦合，有一个很强的准粒子峰。基于有效质量的重整化，耦合常数估计为$1.18\ifmmod\pm\Else\TextPM\fi。在12K以下没有观察到能隙，因此任何基于电荷密度、波形成或表面超导的数据解释都可以被摒弃。
We present high-resolution photoemission experiments of the $\overline{\ensuremath{\Gamma}}$-surface state of Be(0001). The spectral function near the Fermi wave vector reveals a strong quasiparticle peak due to coupling with surface phonon modes. The coupling constant $\ensuremath{\lambda}$ is estimated to be $1.18\ifmmode\pm\else\textpm\fi{}0.07$ based on the renormalization of the effective mass. No gap was observed down to 12 K. Any interpretation of the data based on charge density wave formation or surface superconductivity can therefore be discarded.