Amplitude mode of charge density wave in TTF[Ni(dmit)2]2 observed by electronic Raman scattering

TL;DR

This study uses electronic Raman scattering to observe the amplitude mode of charge density waves in TTF[Ni(dmit)2]2, revealing temperature-dependent features and anisotropic properties linked to band nesting.

Contribution

First observation of the CDW amplitude mode in TTF[Ni(dmit)2]2 via Raman scattering, highlighting its anisotropic nature and relation to band nesting.

Findings

Amplitude mode appears below 60 K at ~9 meV

Mode is anisotropic based on symmetry analysis

CDW linked to band nesting of Ni(dmit)2 chains

Abstract

We measured the optical signature of the charge density waves (CDWs) in the multiband conductor TTF[Ni(dmit)2]2 by electronic Raman scattering. At low energies, a hump develops below 60 K. This hump is associated to the amplitude mode of the CDW with an energy around 9 meV. Raman symmetry-resolved measurements show that the CDW amplitude mode is anisotropic and that the CDW can be associated to the band nesting of Ni(dmit)2 chains.