Temperature-dependent photoemission on 1T-TiSe₂: Interpretation within the exciton condensate phase model
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Monney, Claude
Institut de Physique, Université de Fribourg, Switzerland
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Schwier, Eike Fabian
Institut de Physique, Université de Fribourg, Switzerland
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Garnier, Michael G.
Institut de Physique, Université de Fribourg, Switzerland
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Mariotti, Nicolas
Institut de Physique, Université de Fribourg, Switzerland
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Didiot, Clément
Institut de Physique, Université de Fribourg, Switzerland
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Beck, Hans
Institut de Physique, Université de Fribourg, Switzerland
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Aebi, Philipp
Institut de Physique, Université de Fribourg, Switzerland
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Cercellier, H.
Institut Néel, Grenoble, France -
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Marcus, J.
Institut Néel, Grenoble, France
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Battaglia, C.
Institute of Microengineering, Photovoltaics and Thin Film Electronics Laboratory, EPFL, Neuchâtel, Switzerland
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Berger, H.
Institut de Physique de la Matière Condensée, EPFL, Lausanne, Switzerland
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/301709
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