Charge-density wave transition of1T−VSe2studied by angle-resolved photoemission spectroscopy

• DOI: 10.1103/physrevb.68.155108
• Publication Date: 2003-10-14T00:00:36Z
• Authors: K. Terashima; T. Sato; H. Komatsu; T. Takahashi; N. Maeda; K. Hayashi
• Keywords: 0103 physical sciences; 01 natural sciences

High-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a layered transition-metal dichalcogenide (TMDC) $1T\ensuremath{-}{\mathrm{VSe}}_{2}$ to study the $(4\ifmmode\times\else\texttimes\fi{}4)$ charge-density wave (CDW) mechanism. We observed a partial Fermi-surface (FS) nesting on the electronlike FS centered at the M (L) point. The spectral weight near ${E}_{F}$ is considerably suppressed below the transition temperature ${(T}_{c}=110\mathrm{K})$ around the nested portion, while a negligible spectral change is observed even across ${T}_{c}$ in other portions of FS. This suggests that the CDW transition in $1T\ensuremath{-}{\mathrm{VSe}}_{2}$ is caused by the three-dimensional FS nesting. Implications are discussed in relation to the physical properties of $1T\ensuremath{-}{\mathrm{VSe}}_{2}$ as well as the ARPES results of other TMDC's.