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

Autor:	Erasmus, N., Eichberger, M., Haupt, K., Boshoff, I., Kassier, G., Birmurske, R., Berger, H., Demsar, J., Schwoerer, H.
Rok vydání:	2012
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.109.167402
Popis:	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. Comment: 5 pages, 3 figures, accepted for publication in Phys. Rev. Lett
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1209.0411 Zobrazit plný text záznamu View this record from Arxiv