Microscopic theory on the Raman spectra of transition metal dichalcogenides in CDW state |
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Authors: | N. Nagaosa E. Hanamura |
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Affiliation: | Department of Applied Physics, Faculty of Engineering, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | Microscopic mechanisms are clarified for Raman scattering of collective modes, i.e., amplitude and phase modes in the charge density wave (CDW) state of transition metal dichalcogenides. We study three phonon process in triple CDW state and effects of destruction of the Fermi surface due to the phase transition. It has then been understood how both phase and amplitude modes are given Raman activity and how A-E splittings of both modes and the commensurability pinning of the phase mode are related to the three phonon process. We can also explain change of Raman intensity of the originally Raman active A1g phonon mode at phase transition as interference between paramagnetic and diamagnetic contributions for 2HTaSe2 as well as other materials. |
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