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Suppression and emergence of charge-density waves at the surfaces of layered

The occurrence of standing charge-density waves (CDWs)—periodic modulations of the conduction electron density, which in real materials are always coupled to a periodic lattice distortion—(see [1]) is quite a common phenomenon in transition-metal dichalcogenides (TMDCs) [2], because two important prerequisites are often fulfilled in these layered systems consisting of chemically saturated X–T–X sandwiches (T: transition metal; X: chalcogen): a large electron–phonon coupling and a highly anisotropic band structure with a significant density of occupied states at or near the Fermi level [1]. Yet, despite more than three decades of research, the microscopic mechanism underlying CDW formation in these layer compounds is still not understood. Simple Fermi surface nesting completely fails as an explanation [3] and the more sophisticated models [4] are not fully compatible with the experimental results.
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