Collapse of long-range charge order tracked by time-resolved photoemission at high momenta

Timm Rohwer, Stefan Hellmann, Martin Wiesenmayer, Christian Sohrt, Ankatrin Stange, Bartosz Slomski, Adra Carr, Yanwei Liu, Luis Miaja Avila, Matthias Kalläne, Stefan Mathias, Lutz Kipp, Kai Rossnagel () and Michael Bauer ()
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Timm Rohwer: Institute of Experimental and Applied Physics, University of Kiel
Stefan Hellmann: Institute of Experimental and Applied Physics, University of Kiel
Martin Wiesenmayer: Institute of Experimental and Applied Physics, University of Kiel
Christian Sohrt: Institute of Experimental and Applied Physics, University of Kiel
Ankatrin Stange: Institute of Experimental and Applied Physics, University of Kiel
Bartosz Slomski: Institute of Experimental and Applied Physics, University of Kiel
Adra Carr: JILA, University of Colorado and NIST
Yanwei Liu: University of California, Berkeley, NSF ERC Extreme Ultraviolet Science and Technology
Luis Miaja Avila: Center for Nano and Molecular Science, University of Texas at Austin
Matthias Kalläne: Institute of Experimental and Applied Physics, University of Kiel
Stefan Mathias: JILA, University of Colorado and NIST
Lutz Kipp: Institute of Experimental and Applied Physics, University of Kiel
Kai Rossnagel: Institute of Experimental and Applied Physics, University of Kiel
Michael Bauer: Institute of Experimental and Applied Physics, University of Kiel

Nature, 2011, vol. 471, issue 7339, 490-493

Abstract: A quick look at electron states Angle-resolved photoelectron spectroscopy (ARPES) is widely used to study the electronic structure of crystalline solids such as high-temperature superconductors, topological insulators and graphene-based materials. Time-resolved ARPES has opened the door to the study of the response of such electronic features on ultrafast timescales. Now Rohwer et al. add a new dimension. Using high photon energies, they are able to study ultrafast dynamics at high momenta, at which some of the most interesting fundamental phenomena occur. Applying the technique to the charge density wave material 1T-TiSe2, they obtain stroboscopic images of the electronic band structure at high momentum and show that atomic-scale periodic long-scale order collapses on a surprisingly short timescale of 20 femtoseconds. This work reveals rapid response times in photoinduced properties that could stimulate research into new types of ultrafast switching device.

Date: 2011
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DOI: 10.1038/nature09829

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