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

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 a...

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Autores principales:	M. D. Thomson, K. Rabia, F. Meng, M. Bykov, S. van Smaalen, H. G. Roskos
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ad18fde478cb4892b9fa080ea3c06941
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spelling	oai:doaj.org-article:ad18fde478cb4892b9fa080ea3c069412021-12-02T12:32:53ZPhase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system10.1038/s41598-017-02198-x2045-2322https://doaj.org/article/ad18fde478cb4892b9fa080ea3c069412017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02198-xhttps://doaj.org/toc/2045-2322Abstract 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, both of which can be accounted for by generalizations of the model. Moreover, our considerations emphasize the need to revisit the treatment of inherent electronic damping in quantum-mechanical CDW theories.M. D. ThomsonK. RabiaF. MengM. BykovS. van SmaalenH. G. RoskosNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. D. Thomson K. Rabia F. Meng M. Bykov S. van Smaalen H. G. Roskos Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
description	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, both of which can be accounted for by generalizations of the model. Moreover, our considerations emphasize the need to revisit the treatment of inherent electronic damping in quantum-mechanical CDW theories.
format	article
author	M. D. Thomson K. Rabia F. Meng M. Bykov S. van Smaalen H. G. Roskos
author_facet	M. D. Thomson K. Rabia F. Meng M. Bykov S. van Smaalen H. G. Roskos
author_sort	M. D. Thomson
title	Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
title_short	Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
title_full	Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
title_fullStr	Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
title_full_unstemmed	Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
title_sort	phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ad18fde478cb4892b9fa080ea3c06941
work_keys_str_mv	AT mdthomson phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem AT krabia phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem AT fmeng phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem AT mbykov phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem AT svansmaalen phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem AT hgroskos phasechanneldynamicsrevealtheroleofimpuritiesandscreeninginaquasionedimensionalchargedensitywavesystem
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Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system

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