title: Charge-density-wave-induced modifications to the quasiparticle self-energy in 2H- TaSe2
abstract: 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.
authors.affiliation: Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.initials: T
authors.lastname: Valla
authors.initials: AV
authors.lastname: Fedorov
authors.initials: PD
authors.lastname: Johnson
authors.initials: J
authors.lastname: Xue
authors.initials: KE
authors.lastname: Smith
authors.initials: FJ
authors.lastname: DiSalvo