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Electronic structure of the α-(BEDT-TTF)2I3 surface by photoelectron spectroscopy
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We report anomalies observed in photoelectron spectroscopy measurements performed on α-(BEDT-TTF)2I3 crystals. In particular, above its metal-insulator transition temperature (T ' 135 K), we observe the lack of a sharp Fermi edge in contradiction with the metallic transport properties exhib- ited by this quasi-bidimensional organic material. We interpret these unusual results as a signature of a one-dimensional electronic behavior confirmed by DFT band structure calculations. Using photoelectron spectroscopy we probe a Luttinger liquid with a large correlation parameter (α ą 1) that we interpret to be caused by the chain-like electronic structure of α-(BEDT-TTF)2I3 surface doped by iodine defects. These new surface effects are inaccessible by bulk sensitive measurements of electronic transport techniques.
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TISSEROND, Emilie, et al. Electronic structure of the α-(BEDT-TTF)2I3 surface by photoelectron spectroscopy. European Physical Journal B. 2019. Vol. 92, num. 70, pags. 1-6. ISSN 1434-6028. [consulted: 20 of August of 2026]. Available at: https://hdl.handle.net/2445/184508