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TT: Fachverband Tiefe Temperaturen

TT 39: Correlated Electrons: Charge Order

TT 39.1: Talk

Wednesday, March 20, 2024, 09:30–09:45, H 3025

Kinetic theory and collective modes in the charge-density-wave phase of K0.3MoO3 — Viktor Hahn, •Max O. Hansen, and Peter Kopietz — Goethe University, Frankfurt am Main, Germany

Initiated by recent measurements of collective modes in the charge-density-wave (CDW) state of the electronically quasi-one-dimensional material K0.3MoO3 [1], we present a theoretical study of amplitude and phase modes in the incommensurate CDW state. For this purpose we formulate a kinetic theory using an expansion in powers of connected equal-time correlations. Our linearized kinetic equations for the CDW order parameter have the same form as the phenomenological equation of motion obtained within a time-dependent Ginzburg-Landau approach. Frequencies and damping coefficients for the amplitude and phase modes in the CDW state can be extracted numerically or directly from the linearized kinetic equations. We find that the damping is strongly enhanced when the temperature approaches the critical temperature from below, in agreement with recent experiments [1].

[1] K. Warawa, N. Christophel, S. Sobolev, J. Demsar, H. G. Roskos, M. D. Thomson, Phys. Rev. B 108 (2023) 045147.

Keywords: charge-desnity-wave; CDW; quasi-one-dimensional; Ginzburg–Landau theory; kinetic equation