Abstract
The electronic response including electron-phonon matrix elements in a simple tight-binding model is calculated for the 'dz2' sub-band in 2H-NbSe2. This function, in contrast to the bare response, shows a peak in the region of the charge density wave (CDW) wavevector. It is therefore concluded that the CDW is driven not simply by Fermi surface nesting but rather by a combination of matrix element effects and weak nesting.
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