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

  • Émilie Tisserond
  • Niloufar Nilforoushan
  • Marco Caputo
  • Pere Alemany
  • Enric Canadell
  • Lama Khalil
  • Ivana Vobornik
  • Jun Fujii
  • Pranab Kumar Das
  • Cécile Mézière
  • Patrick Batail
  • Jean-Paul Pouget
  • Claude Pasquier
  • Marino Marsi
  • Miguel MonteverdeEmail author
Regular Article
  • 53 Downloads

Abstract

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 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.

Graphical abstract

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Émilie Tisserond
    • 1
  • Niloufar Nilforoushan
    • 1
  • Marco Caputo
    • 1
  • Pere Alemany
    • 2
  • Enric Canadell
    • 3
  • Lama Khalil
    • 1
    • 4
  • Ivana Vobornik
    • 5
  • Jun Fujii
    • 5
  • Pranab Kumar Das
    • 5
    • 6
  • Cécile Mézière
    • 7
  • Patrick Batail
    • 7
  • Jean-Paul Pouget
    • 1
  • Claude Pasquier
    • 1
  • Marino Marsi
    • 1
  • Miguel Monteverde
    • 1
    Email author
  1. 1.Laboratoire de Physique des Solides, CNRS-Université Paris-Sud UMR 8502Orsay CedexFrance
  2. 2.Departament de Ciència de Materials i Química Física and Institut de Química Teórica i Computacional (IQTCUB), Universitat de BarcelonaBarcelonaSpain
  3. 3.Institut de Ciència de Materials de Barcelona (CSIC), Campus UABBellaterraSpain
  4. 4.Synchrotron SOLEILGif-sur-YvetteFrance
  5. 5.CNR-IOM Laboratorio TASCTriesteItaly
  6. 6.International Centre for Theoretical Physics (ICTP)TriesteItaly
  7. 7.MOLTECH-Anjou, CNRS-Université d’Angers UMR 6200, Bâtiment KAngers CedexFrance

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