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  Snapshots of cooperative atomic motions in the optical suppression of charge density waves

Eichberger, M., Schäfer, H., Krumova, M., Beyer, M., Demsar, J., Berger, H., et al. (2010). Snapshots of cooperative atomic motions in the optical suppression of charge density waves. Nature, 468(7325), 799-802. doi:10.1038/nature09539.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-18C4-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-18C5-6
Genre: Journal Article

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http://dx.doi.org/10.1038/nature09539 (Publisher version)
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 Creators:
Eichberger, Maximilian1, Author
Schäfer, Hanjo1, Author
Krumova, Marina2, Author
Beyer, Markus1, Author
Demsar, Jure1, 3, Author
Berger, Helmuth4, Author
Moriena, Gustavo5, 6, 7, Author              
Sciaini, Germán5, 6, 7, Author              
Miller, R. J. Dwayne5, 6, 7, Author              
Affiliations:
1Physics Department and Center of Applied Photonics and Zukunftskolleg, University of Konstanz, D-78457 Konstanz, Germany, ou_persistent22              
2Department of Chemistry, University of Konstanz, D-78457 Konstanz, Germany, ou_persistent22              
3Complex Matter Department, Jozef Stefan Institute, SI-1000 Ljubljana, Slovenia, ou_persistent22              
4Physics Department, EPFL CH-1015 Lausanne, Switzerland, ou_persistent22              
5Atomically Resolved Structural Dynamics Division, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173636              
6Institute for Optical Sciences and Departments of Chemistry and Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada, ou_persistent22              
7Centre for Free Electron Laser Science, D-22607 Hamburg, Germany, ou_persistent22              

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Free keywords: Applied physics; Engineering; Materials science
 Abstract: Macroscopic quantum phenomena such as high-temperature superconductivity, colossal magnetoresistance, ferrimagnetism and ferromagnetism arise from a delicate balance of different interactions among electrons, phonons and spins on the nanoscale. The study of the interplay among these various degrees of freedom in strongly coupled electron–lattice systems is thus crucial to their understanding and for optimizing their properties. Charge-density-wave (CDW) materials, with their inherent modulation of the electron density and associated periodic lattice distortion, represent ideal model systems for the study of such highly cooperative phenomena. With femtosecond time-resolved techniques, it is possible to observe these interactions directly by abruptly perturbing the electronic distribution while keeping track of energy relaxation pathways and coupling strengths among the different subsystems. Numerous time-resolved experiments have been performed on CDWs, probing the dynamics of the electronic subsystem. However, the dynamics of the periodic lattice distortion have been only indirectly inferred. Here we provide direct atomic-level information on the structural dynamics by using femtosecond electron diffraction to study the quasi two-dimensional CDW system 1T-TaS2. Effectively, we have directly observed the atomic motions that result from the optically induced change in the electronic spatial distribution. The periodic lattice distortion, which has an amplitude of ~0.1 Å, is suppressed by about 20% on a timescale (~250 femtoseconds) comparable to half the period of the corresponding collective mode. These highly cooperative, electronically driven atomic motions are accompanied by a rapid electron–phonon energy transfer (~350 femtoseconds) and are followed by fast recovery of the CDW (~4 picoseconds). The degree of cooperativity in the observed structural dynamics is remarkable and illustrates the importance of obtaining atomic-level perspectives of the processes directing the physics of strongly correlated systems.

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Language(s): eng - English
 Dates: 2010-05-172010-09-242010-11-242010-12-09
 Publication Status: Published in print
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/nature09539
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 468 (7325) Sequence Number: - Start / End Page: 799 - 802 Identifier: ISSN: 0028-0836
CoNE: /journals/resource/954925427238