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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, NILFOROUSHAN, Niloufar, CAPUTO, Marco, ALEMANY I CAHNER, Pere, CANADELL, Enric, KHALIL, Lama, VOBORNIK, Ivana, FUJII, Jun, DAS KUMAR, Pranab, MÉZIÈRE, Cécile, BATAIL, Patrick, POUGET, Jean-paul, PASQUIER, Claude, MARSI, Marino, MONTEVERDE, Miguel. Electronic structure of the α-(BEDT-TTF)2I3 surface by photoelectron spectroscopy. _European Physical Journal B_. 2019. Vol. 92, núm. 70, pàgs. 1-6. [consulta: 23 de gener de 2026]. ISSN: 1434-6028. [Disponible a: https://hdl.handle.net/2445/184508]