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

Nature Communications
L RettigU Bovensiepen

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.

References

Nov 26, 2010·Nature·Maximilian EichbergerR J Dwayne Miller
Jan 15, 2011·Science·D FaustiA Cavalleri
May 12, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·K Rossnagel
Sep 20, 2012·Nature Communications·S HellmannK Rossnagel
Dec 19, 2012·Proceedings of the National Academy of Sciences of the United States of America·Hans-Martin EiterLeonardo Degiorgi
May 20, 2014·Physical Review Letters·Wen ShenJ K Freericks
Nov 22, 2014·Faraday Discussions·L RettigM Wolf

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Citations

Jul 2, 2016·Science·Uwe Bovensiepen, Manuel Ligges
Jan 4, 2017·The Review of Scientific Instruments·Y IshidaY Kobayashi
May 3, 2020·The Review of Scientific Instruments·Changmin LeeNuh Gedik
Aug 7, 2019·Physical Review Letters·M Chávez-CervantesI Gierz
May 5, 2021·Nature Communications·J MaklarL Rettig

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