Charge-density waves observed at 4.2 K by scanning-tunneling microscopy

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Abstract

Scanning-tunneling-microscope images of layer structure dichalcogenides exhibiting charge-density-waves (CDW's) have been studied at 4.2 K. CDW amplitudes in the 2H, 1T, and 4Hb phases of ${\mathrm{TaSe}}_{2}$ have been measured with the strongest CDW phase showing only the superlattice modulation while the weaker CDW phases show simultaneous CDW and surface-atom modulations. In 2H-${\mathrm{NbSe}}_{2}$ a well-resolved hexagonal CDW superlattice superimposed on the dominant surface-atom pattern is observed.

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