Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system

Scientific Reports
M D ThomsonH G Roskos

Abstract

Charge density waves (CDWs), i.e. the periodic spatial modulation of coupled electronic and lattice density, are ubiquitous in low-dimensional conductors and have taken on renewed relevance due their role in state-of-the-art materials, e.g. high-T c superconductors, topological insulators and low-dimensional carbon. As CDWs are described by a complex order parameter to represent both the amplitude and phase, they are formally analogous to BCS superconductors and spin-waves, providing a prototype of collective phenomena for the further development of field theories and ab-initio calculations of complex solids. The low-energy excitations are mixed electron-phonon quanta which ideally separate into an amplitude and phase channel, and provide a sensitive probe of the ground state and non-equilibrium dynamics, including ultrafast photoinduced phase transitions. While recent studies of the amplitude modes have brought substantial progress aided by a phenomenological Ginzburg-Landau framework, we focus here on the phase modes using ultrafast terahertz spectroscopy. Experiments on K0.3MoO3 provide a more complete picture, and reveal a high sensitivity to interactions with impurities and screening effects from photogenerated carriers, b...Continue Reading

References

Aug 15, 1985·Physical Review. B, Condensed Matter·I Tütto, A Zawadowski
Oct 1, 1985·Physical Review. B, Condensed Matter·S TakadaT Holstein
Apr 15, 1986·Physical Review. B, Condensed Matter·R M FlemingR G Dunn
Sep 15, 1994·Physical Review. B, Condensed Matter·S Turgut, L M Falicov
Sep 15, 1989·Physical Review. B, Condensed Matter·J R Tucker
Oct 15, 1991·Physical Review. B, Condensed Matter·L DegiorgiG Grüner
Jul 15, 1993·Physical Review. B, Condensed Matter·A Virosztek, K Maki
Jun 4, 2008·Physical Review Letters·S RaghuShou-Cheng Zhang
Mar 5, 2009·Physical Review Letters·A TomeljakJ Demsar
Jan 15, 2011·Physical Review Letters·N DeanA Cavalleri
Apr 25, 2015·Physical Review Letters·Ryota ShimizuTaro Hitosugi

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Citations

Mar 11, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Soumitra HazraRajeev N Kini
Jan 16, 2021·Physical Review Letters·L X YangK Rossnagel

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Methods Mentioned

BETA
x-ray diffraction

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