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In this Letter we report the observation, by scanning tunneling microscopy, of a Mott metal to insulator transition at the surface of 1T-TaSe2. Our spectroscopic data compare considerably well with previous angle-resolved photoemission spectroscopy measurements and confirm the presence of a large hysteresis related to a first order process. The local character of the tunneling spectroscopy technique allows a direct visualization of the surface symmetry and provides spectroscopic measurements on the defect-free region of the sample. It follows that the electronic localization is driven purely by the enhancement of the charge density wave amplitude which drives a bandwidth controlled metal-insulator transition.
Philip Johannes Walter Moll, Matthias Carsten Putzke, Andrew Scott Hunter
Klaus Kern, Markus Etzkorn, Jacob Senkpiel
Christian Wäckerlin, Ulrich Aschauer, Xing Wang, Mehdi Heydari