Abstract
We conduct Angle Resolved Photoemission Spectroscopy (ARPES) investigation on 2H -TaS 2 , a prototypical incommensurate Charge Density Wave (CDW) material. A comparative study of the low-energy electronic structures of 2H -TaS 2 and two other related compounds, 2H -TaSe 2 and 2H -NbSe 2 , identifies several generic features of their CDW orders. Firstly, Fermi surface (FS) nesting alone doesn’t seem to give rise to the CDW instability in these compounds. Secondly, partial gapping of the underlying FS surface in the CDW state is common to each of these materials. Finally, the CDW energy gap, unlike the energy gap in a superconductor, is not symmetric with respect to the chemical potential.
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