Evidence for an Excitonic Insulator Phase in
Top Cited Papers
- 4 October 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 99 (14), 146403
- https://doi.org/10.1103/physrevlett.99.146403
Abstract
We present a new high-resolution angle-resolved photoemission study of 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 .
Keywords
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