Valla, T; Fedorov, AV; Johnson, PD; Xue, J; Smith, KE; DiSalvo, FJ
Physical review letters,
2000-Nov-27, 20001127, Volume:
85, Issue:
22
Journal Article
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 approximately 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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