Evidence for an Excitonic Insulator Phase in 1TTiSe2

H. Cercellier, C. Monney, F. Clerc, C. Battaglia, L. Despont, M. G. Garnier, H. Beck, P. Aebi, L. Patthey, H. Berger, and L. Forró
Phys. Rev. Lett. 99, 146403 – Published 4 October 2007

Abstract

We present a new high-resolution angle-resolved photoemission study of 1TTiSe2 in both its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the photoemission spectra are strongly modified, with large band renormalizations at high-symmetry points of the Brillouin zone and a very large transfer of spectral weight to backfolded bands. A calculation of the theoretical spectral function for an excitonic insulator phase reproduces the experimental features with very good agreement. This gives strong evidence in favor of the excitonic insulator scenario as a driving force for the charge-density wave transition in 1TTiSe2.

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  • Received 30 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.146403

©2007 American Physical Society

Authors & Affiliations

H. Cercellier*, C. Monney, F. Clerc, C. Battaglia, L. Despont, M. G. Garnier, H. Beck, and P. Aebi

  • Institut de Physique, Université de Neuchâtel, CH-2000 Neuchâtel, Switzerland

L. Patthey

  • Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

H. Berger and L. Forró

  • Institut de Physique de la Matière Complexe, EPFL, CH-1015 Lausanne, Switzerland

  • *herve.cercellier@grenoble.cnrs.fr

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Issue

Vol. 99, Iss. 14 — 5 October 2007

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