Mott phase at the surface of 1T-TaSe2 observed by scanning tunneling microscopy |
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Authors: | Colonna Stefano Ronci Fabio Cricenti Antonio Perfetti Luca Berger Helmuth Grioni Marco |
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Institution: | CNR Istituto di Struttura della Materia, Via Fosso del Cavaliere, 100, 00133 Roma Italy. |
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Abstract: | 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. |
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