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

Title data

Thomson, M. D. ; Rabia, K. ; Meng, F. ; Bykov, Maxim ; van Smaalen, Sander ; Roskos, H. G.:
Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system.
In: Scientific Reports. Vol. 7 (17 May 2017) Issue 1 . - 9 S..
ISSN 2045-2322
DOI: https://doi.org/10.1038/s41598-017-02198-x

Official URL: Volltext

Abstract in another language

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-Tc 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Article number: 2039
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Jul 2017 06:37
Last Modified: 21 Nov 2017 09:59
URI: https://eref.uni-bayreuth.de/id/eprint/38412