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

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. In conclusion, 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.

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [3];  [5];  [2];  [1]
  1. Univ. Duisburg-Essen, Duisburg (Germany); Freie Univ. Berlin, Berlin (Germany)
  2. Freie Univ. Berlin, Berlin (Germany); Fritz-Haber-Institut der MPG, Berlin (Germany)
  3. Geballe Lab. for Advanced Materials, Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Geballe Lab. for Advanced Materials, Stanford, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1238254
Grant/Contract Number:  
AC03-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; physical sciences; condensed matter

Citation Formats

Rettig, L., Cortés, R., Chu, J. -H., Fisher, I. R., Schmitt, F., Moore, R. G., Shen, Z. -X., Kirchmann, P. S., Wolf, M., and Bovensiepen, U. Persistent order due to transiently enhanced nesting in an electronically excited charge density wave. United States: N. p., 2016. Web. doi:10.1038/ncomms10459.
Rettig, L., Cortés, R., Chu, J. -H., Fisher, I. R., Schmitt, F., Moore, R. G., Shen, Z. -X., Kirchmann, P. S., Wolf, M., & Bovensiepen, U. Persistent order due to transiently enhanced nesting in an electronically excited charge density wave. United States. https://doi.org/10.1038/ncomms10459
Rettig, L., Cortés, R., Chu, J. -H., Fisher, I. R., Schmitt, F., Moore, R. G., Shen, Z. -X., Kirchmann, P. S., Wolf, M., and Bovensiepen, U. Mon . "Persistent order due to transiently enhanced nesting in an electronically excited charge density wave". United States. https://doi.org/10.1038/ncomms10459. https://www.osti.gov/servlets/purl/1238254.
@article{osti_1238254,
title = {Persistent order due to transiently enhanced nesting in an electronically excited charge density wave},
author = {Rettig, L. and Cortés, R. and Chu, J. -H. and Fisher, I. R. and Schmitt, F. and Moore, R. G. and Shen, Z. -X. and Kirchmann, P. S. and Wolf, M. and Bovensiepen, U.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1038/ncomms10459},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2016},
month = {Mon Jan 25 00:00:00 EST 2016}
}

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Cited by: 39 works
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