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We use scanning tunnelling microscopy and spectroscopy to explore theelectronic structure of Fe$_{1.07}$Te which is the parent compound of theiron-chalcogenide superconductors. A unidirectional electronic structure with aperiod of $a_{0}$ (where $a_{0}$ is the lattice constant) along the a-axis isobserved. The unidirectional pattern is visible within an energy range fromapproximately -200 to +130 meV. Since the direction of the unidirectionalelectronic structure coincides with those of the underlying antiferromagneticand the predicted orbital orders, it is presumable that the observedunidirectional structure is closely tied to these orders and is peculiar to theparent state in iron-based superconductors.

Unidirectional Electronic Structure in the Parent State of Iron-Chalcogenide Superconductor Fe$_{1+\delta}$Te