畴壁对1 $T$ $_2$插层铜的无公度电荷密度波态的影响
Influence of domain walls in the incommensurate charge density wave state of Cu intercalated 1$T$-TiSe$_2$
摘要：
本文报道了用低温扫描隧道显微镜研究1-$T$ -TiSe $_2$和Cu $_{0.08}$ TiSe $_2$中的电荷密度波（CDW）序.在原始1 $T$ -TiSe $_2$中，我们观察到长程相干相称CDW（C-CDW）顺序。相比之下，Cu $_{0.08}$ TiSe $_{2}$显示出不相称的CDW（I-CDW）相，其中局部C-CDW域由域壁分开。态密度的测量表明，域壁主机附近的费米能级，这可能在该系统中的超导性的出现发挥作用的费米子的额外人口。傅里叶变换扫描隧道光谱研究表明，CDW形成的I-CDW相的主导机制可能是电子-声子耦合。
英文摘要：
We report a low-temperature scanning tunneling microscopy study of the charge density wave (CDW) order in 1$T$-TiSe$_2$ and Cu$_{0.08}$TiSe$_2$. In pristine 1$T$-TiSe$_2$ we observe a long-range coherent commensurate CDW (C-CDW) order. In contrast, Cu$_{0.08}$TiSe$_{2}$ displays an incommensurate CDW (I-CDW) phase with localized C-CDW domains separated by domain walls. Density of states measurements indicate that the domain walls host an extra population of fermions near the Fermi level which may play a role in the emergence of superconductivity in this system. Fourier transform scanning tunneling spectroscopy studies suggest that the dominant mechanism for CDW formation in the I-CDW phase may be electron-phonon coupling.
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