Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 85: Electron and spin dynamics I
O 85.8: Vortrag
Donnerstag, 17. März 2011, 18:15–18:30, WIL A317
Time-resolved Fermi surface mapping and dynamics of the double-CDW transition in HoTe3 — •L. Rettig1,2, R. Cortes1,3, J.-H. Chu4, I.R. Fisher4, F. Schmitt4, P.S. Kirchmann4, Z.-X. Shen4, M. Wolf3, and U. Bovensiepen2 — 1Fachb. Physik, Freie Univ. Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fak. f. Physik, Univ. Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany — 3Abt. Phys. Chemie, Fritz-Haber-Institut d. MPG, Faradayweg 4-6, 14195 Berlin, Germany — 4Geballe Lab. f. Adv. Mat. and Dep. of Appl. Phys., Stanford Univ., CA 94305, USA
The family of rare earth tritellurides RTe3 presents a textbook-like model system to study the effects of Fermi surface (FS) nesting driven charge density wave (CDW) formation in a low-dimensional electronic system. Depending on R, the system exhibits one or two successive CDW transitions. The collective excitations responsible for such phenomena can be investigated by time-resolved experiments. Employing fs time- and angle-resolved photoemission, the ultrafast melting of the CDW gapped state and the excitation of the amplitude mode could be demonstrated in the single-CDW compound TbTe3. Using a novel position-sensitive Time-of-Flight spectrometer (pTOF) [2], we were now able to investigate the dynamics of both occupied and unoccupied electronic states over a contiguous area of the reciprocal space. Thus, we can follow the evolution of the FS after optical excitation with fs time resolution and observe the dynamics even of the smaller gap and its amplitude mode in the double-CDW compound HoTe3.
[2] P. S. Kirchmann, et al., Appl. Phys. A 91, 211 (2008)