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We have studied the nature of the surface charge distribution in CeTe3. Thisis a simple, cleavable, layered material with a robust one-dimensionalincommensurate charge density wave (CDW). Scanning tunneling microscopy (STM)has been applied on the exposed surface of a cleaved single crystal. At 77 K,the STM images show both the atomic lattice of surface Te atoms arranged in asquare net and the CDW modulations oriented at 45 degrees with respect to theTe net. Fourier transform of the STM data shows Te square lattice peaks, andpeaks related to the CDW oriented at 45 degrees to the lattice peaks. Inaddition, clear peaks are present, consistent with subsurface structure andwave vector mixing effects. These data are supported by electronic structurecalculations, which show that the subsurface signal most likely arises from alattice of Ce atoms situated 2.53 angstroms below the surface Te net.

Scanning tunneling microscopy study of the CeTe3 charge density wave