Journal article

Temperature-dependent photoemission on 1T-TiSe₂: Interpretation within the exciton condensate phase model

  • Monney, Claude Institut de Physique, Université de Fribourg, Switzerland
  • Schwier, Eike Fabian Institut de Physique, Université de Fribourg, Switzerland
  • Garnier, Michael G. Institut de Physique, Université de Fribourg, Switzerland
  • Mariotti, Nicolas Institut de Physique, Université de Fribourg, Switzerland
  • Didiot, Clément Institut de Physique, Université de Fribourg, Switzerland
  • Beck, Hans Institut de Physique, Université de Fribourg, Switzerland
  • Aebi, Philipp Institut de Physique, Université de Fribourg, Switzerland
  • Cercellier, H. Institut Néel, Grenoble, France -
  • Marcus, J. Institut Néel, Grenoble, France
  • Battaglia, C. Institute of Microengineering, Photovoltaics and Thin Film Electronics Laboratory, EPFL, Neuchâtel, Switzerland
  • Berger, H. Institut de Physique de la Matière Condensée, EPFL, Lausanne, Switzerland
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    06.04.2010
Published in:
  • Physical Review B. - 2010, vol. 81, no. 15, p. 1551104
English The charge-density-wave phase transition of 1T-TiSe₂ is studied by angle-resolved photoemission over a wide temperature range. An important chemical-potential shift which strongly evolves with temperature is evidenced. In the framework of the exciton condensate phase, the detailed temperature dependence of the associated order parameter is extracted. Having a mean-field-like behavior at low temperature, it exhibits a nonzero value above the transition, interpreted as the signature of strong excitonic fluctuations, reminiscent of the pseudogap phase of high-temperature superconductors. Integrated intensity around the Fermi level is found to display a trend similar to the measured resistivity and is discussed within the model.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301709
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