Abstract
The layered semi-metallic T d phase of WTe 2 has been examined by STM in UHV. The effects of transient transfer of tip apex atom from/to the surface (W ↔ Te exchange) on the imaging conditions have been observed; the effects demonstrate the inadequacy of the Tersoff-Hamann approximation to the description of the tunnelling process. Two distinctly different point-defect configurations have been observed, assigned tentatively to vacancies in either “top” or “bottom” Te sites. Anomalous image conditions were observed frequently; these have been ascribed to delamination of the structure, and consequential transfer of the tunnelling to a delocalised internal gap, with the image representing the averaged tunnel current during relative displacements of two neighbouring Te planes.
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