Persistent order due to transiently enhanced nesting in an electronically excited charge density wave

L. Rettig (), R. Cortés, J.-H. Chu, I. R. Fisher, F. Schmitt, R. G. Moore, Z.-X. Shen, P. S. Kirchmann, M. Wolf and U. Bovensiepen ()
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L. Rettig: Fakultät für Physik, Universität Duisburg-Essen
R. Cortés: Fachbereich Physik, Freie Universität Berlin
J.-H. Chu: Geballe Laboratory for Advanced Materials
I. R. Fisher: Geballe Laboratory for Advanced Materials
F. Schmitt: Geballe Laboratory for Advanced Materials
R. G. Moore: SLAC National Accelerator Laboratory, Stanford Institute for Material and Energy Sciences
Z.-X. Shen: Geballe Laboratory for Advanced Materials
P. S. Kirchmann: SLAC National Accelerator Laboratory, Stanford Institute for Material and Energy Sciences
M. Wolf: Fachbereich Physik, Freie Universität Berlin
U. Bovensiepen: Fakultät für Physik, Universität Duisburg-Essen

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Non-equilibrium conditions may lead to novel properties of materials with broken symmetry ground states not accessible in equilibrium as vividly demonstrated by non-linearly driven mid-infrared active phonon excitation. Potential energy surfaces of electronically excited states also allow to direct nuclear motion, but relaxation of the excess energy typically excites fluctuations leading to a reduced or even vanishing order parameter as characterized by an electronic energy gap. Here, using femtosecond time- and angle-resolved photoemission spectroscopy, we demonstrate a tendency towards transient stabilization of a charge density wave after near-infrared excitation, counteracting the suppression of order in the non-equilibrium state. Analysis of the dynamic electronic structure reveals a remaining energy gap in a highly excited transient state. Our observation can be explained by a competition between fluctuations in the electronically excited state, which tend to reduce order, and transiently enhanced Fermi surface nesting stabilizing the order.

Date: 2016
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DOI: 10.1038/ncomms10459

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