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American Physical Society, Physical Review Letters, 22(85), p. 4759-4762, 2000

DOI: 10.1103/physrevlett.85.4759

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Charge-Density-Wave induced modifications to the quasiparticle self-energy in 2H TaSe2

Journal article published in 2000 by T. Valla, A. V. Fedorov ORCID, P. D. Johnson, J. Xue, K. E. Smith, F. J. Di Salvo, F. J. DiSalvo
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This paper is available in a repository.

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Abstract

The self-energy of the photo-hole in 2H-TaSe2 is measured by angle-resolved photoemission spectroscopy (ARPES) as a function of binding energy and temperature. In the charge-density wave (CDW) state, a structure in the self- energy is detected at ~ 65 meV that can not be explained by electron-phonon scattering. A reduction in the scattering rates below this energy indicates the collapse of a major scattering channel with the formation of the CDW state, accompanying the appearance of a bosonic "mode" in the excitation spectrum of the system. ; Comment: 4 pages, 4 eps figures, minor changes, references added