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Electronic structure of the α-(BEDT-TTF)2I3 surface by photoelectron spectroscopy

AuthorsTisserond, Émilie; Nilforoushan, Niloufar; Caputo, Marco; Alemany, Pere; Canadell, Enric ; Khalil, Lama; Vobornik, Ivana; Fujii, Jun; Das, Pranab Kumar; Mézière, Cécile; Batail, Patrick; Pouget, Jean-Paul; Pasquier, Claude; Marsi, Marino; Monteverde, Miguel
KeywordsSolid State
Issue Date3-Apr-2019
CitationEuropean Physical Journal B - Condensed Matter 92(4):70
AbstractWe 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 exhibited 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 > 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.
Publisher version (URL)http://dx.doi.org/10.1140/epjb/e2019-90565-4
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