Publikation: Ultrafast Dynamics of Charge Density Waves in 4Hb−TaSe2 Probed by Femtosecond Electron Diffraction
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2012
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Erasmus, Nicolas
Haupt, Kerstin
Boshoff, Ilana
Kassier, Günther
Birmurske, Reinhard
Berger, Helmuth
Schwoerer, Heinrich
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Physical Review Letters. American Physical Society (APS). 2012, 109(16), 167402. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.109.167402
Zusammenfassung
The dynamics of the photoinduced commensurate-to-incommensurate charge density wave (CDW) phase transition in 4Hb−TaSe2 are investigated by femtosecond electron diffraction. In the perturbative regime, the CDW re-forms on a 150-ps time scale, which is two orders of magnitude slower than in other transition-metal dichalcogenides. We attribute this to a weak coupling between the CDW carrying T layers and thus demonstrate the importance of three-dimensionality for the existence of CDWs. With increasing optical excitation, the phase transition is achieved, showing a second-order character, in contrast to the first-order behavior in thermal equilibrium.
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ERASMUS, Nicolas, Maximilian EICHBERGER, Kerstin HAUPT, Ilana BOSHOFF, Günther KASSIER, Reinhard BIRMURSKE, Helmuth BERGER, Jure DEMSAR, Heinrich SCHWOERER, 2012. Ultrafast Dynamics of Charge Density Waves in 4Hb−TaSe2 Probed by Femtosecond Electron Diffraction. In: Physical Review Letters. American Physical Society (APS). 2012, 109(16), 167402. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.109.167402BibTex
@article{Erasmus2012-10-19Ultra-49288,
year={2012},
doi={10.1103/PhysRevLett.109.167402},
title={Ultrafast Dynamics of Charge Density Waves in 4H<sub>b</sub>−TaSe<sub>2</sub> Probed by Femtosecond Electron Diffraction},
number={16},
volume={109},
issn={0031-9007},
journal={Physical Review Letters},
author={Erasmus, Nicolas and Eichberger, Maximilian and Haupt, Kerstin and Boshoff, Ilana and Kassier, Günther and Birmurske, Reinhard and Berger, Helmuth and Demsar, Jure and Schwoerer, Heinrich},
note={Article Number: 167402}
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<dcterms:abstract xml:lang="eng">The dynamics of the photoinduced commensurate-to-incommensurate charge density wave (CDW) phase transition in 4H<sub>b</sub>−TaSe<sub>2</sub> are investigated by femtosecond electron diffraction. In the perturbative regime, the CDW re-forms on a 150-ps time scale, which is two orders of magnitude slower than in other transition-metal dichalcogenides. We attribute this to a weak coupling between the CDW carrying T layers and thus demonstrate the importance of three-dimensionality for the existence of CDWs. With increasing optical excitation, the phase transition is achieved, showing a second-order character, in contrast to the first-order behavior in thermal equilibrium.</dcterms:abstract>
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