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Brandt, J.
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article
Reconfiguration of charge density waves by surface nanostructures on TaS2
Abstract
<p>The transition metal dichalcogenide 1T-TaS<sub>2</sub> forms charge density waves due to the quasi-two-dimensionality of its electronic structure. Here we show how the growth of Rb nanowires on the surface of 1T-TaS<sub>2</sub> affects the superstructure of the charge density waves. Scanning tunneling microscopy and low-energy electron diffraction studies show the replacement of the normal TaS<sub>2</sub> room temperature √13 × √13 phase by c(2 √3 × 4)rect. and 3 × 3 superstructures depending on the state of nanowire growth. Furthermore, angle resolved photoemission studies give evidence for a metal to semiconductor transition when the superstructure of the charge density wave is changed. These changes are discussed in the context of nanowire growth, which is accompanied by a change in the dimensionality of the electronic states of 1T-TaS<sub>2</sub>.</p>