The tunneling spectrum of 1T-TiSe₂ in the charge density wave (CDW) state shows a dip structure below the Fermi level, and it is unclear whether this dip is a CDW gap. Answering this question is important because information regarding the CDW gap estimated from the dip is referred in discussions of the driving mechanism of this CDW. Therefore, we used scanning tunneling microscopy/scanning tunneling spectroscopy to acquire tunneling spectra for the normal and CDW states in TiSe₂ and compared the spectra. Specifically, we measured pure TiSe₂ at 293 K (>T_CDW) and 4.2 K (<T_CDW) and annealed TiSe₂, in which the CDW is suppressed. As a result, we found that the tunneling spectra for the normal states exhibit a dip below the Fermi level similar to the spectrum for the CDW state. These results indicate that the dip itself is not a CDW gap.

1 T -TiSe ₂在电荷密度波(CDW)态的隧道谱显示出费米能级以下的倾角结构，目前尚不清楚该倾角是否为CDW能隙。回答这个问题很重要，因为在讨论该 CDW 的驱动机制时会引用有关根据下降估计的 CDW 间隙的信息。_{因此，我们使用扫描隧道显微镜/扫描隧道光谱来获取TiSe 2}中正常态和CDW态的隧道光谱并进行比较。具体来说，我们在 293 K (> T _CDW ) 和 4.2 K (< T _CDW )下测量了纯 TiSe ₂以及CDW 受到抑制的退火TiSe _{2 。}结果，我们发现正常态的隧道光谱表现出低于费米能级的下降，类似于 CDW 态的光谱。这些结果表明下降本身并不是 CDW 缺口。