Ultrafast dynamics of charge density waves in 4Hb-TaSe2 probed by femtosecond electron diffraction

Abstract

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 reforms on a 150 ps timescale, 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.

5 pages, 3 figures, accepted for publication in Phys. Rev. Lett

References in corpus (3)

• Fermi surface nesting and the origin of Charge Density Waves in metals
• Dynamics of photoinduced Charge Density Wave-metal phase transition in K0.3MoO3
• Strong electron-lattice coupling as the mechanism behind charge density wave transformations in transition-metal dichalcogenides

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