The joint density of states of two different 2H-structured transition metal dichalcogenides (TMDs) with and without charge density wave (CDW), Na0.05TaS2and Cu0.09NbS2, respectively, are compared. While there is a clear maximum at the 3 × 3 charge density wavevector for Na0.05TaS2, the joint density of states for Cu0.09NbS2does not show such behavior, consistent with the absence of CDW in the system. Our results illustrate that the joint density of states well represents the charge instability in 2D systems. © 2008 Elsevier Ltd. All rights reserved.
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