Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 22, Pages 4759-4762Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4759
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The self-energy of the photohole in 2H-TaSe2 is measured by angle-resolved photoemission spectroscopy as a function:of binding energy and temperature. In the charge-density wave (CDW) state, a structure in the self-energy is detected at similar to 65 meV that cannot 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.
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