Ultrafast Dynamics of Charge Density Waves in4Hb−TaSe2Probed by Femtosecond Electron Diffraction

Autor:	Reinhard Birmurske, Heinrich Schwoerer, Jure Demsar, Maximilian Eichberger, Helmuth Berger, G. H. Kassier, N. Erasmus, Ilana Boshoff, K. Haupt
Rok vydání:	2012
Předmět:	Thermal equilibrium Phase transition Materials science Electron diffraction Condensed matter physics Condensed Matter::Superconductivity Femtosecond General Physics and Astronomy Charge density Condensed Matter::Strongly Correlated Electrons Charge density wave Excitation Order of magnitude
Zdroj:	Physical Review Letters. 109
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.109.167402
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::82fed0a4d3c681507348aff251383425 https://doi.org/10.1103/physrevlett.109.167402 Zobrazit plný text záznamu