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Microscopic theory on the Raman spectra of transition metal dichalcogenides in CDW state

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
41
Issue
11
Identifiers
DOI: 10.1016/0038-1098(82)91254-6

Abstract

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 partial 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 A 1g phonon mode at phase transition as interference between paramagnetic and diamagnetic contributions for 2HTaSe 2 as well as other materials.

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