Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.167402
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Funding
- South African Research Chair Initiative of the Department of Science and Technology
- National Research Foundation
- Alexander von Humboldt Foundation
- Center for Applied Photonics at the University of Konstanz
- Stiftung der Deutschen Wirtschaft (sdw)
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The dynamics of the photoinduced commensurate-to-incommensurate charge density wave (CDW) phase transition in 4H(b)-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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