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Title: Light-induced charge density wave in LaTe3

Abstract

When electrons in a solid are excited by light, they can alter the free energy landscape and access phases of matter that are out of reach in thermal equilibrium. This accessibility becomes important in the presence of phase competition, when one state of matter is preferred over another by only a small energy scale that, in principle, is surmountable by the excitation. Here, we study a layered compound, LaTe3, where a small lattice anisotropy in the a–c plane results in a unidirectional charge density wave (CDW) along the c axis1,2. Using ultrafast electron diffraction, we find that, after photoexcitation, the CDW along the c axis is weakened and a different competing CDW along the a axis subsequently emerges. The timescales characterizing the relaxation of this new CDW and the reestablishment of the original CDW are nearly identical, which points towards a strong competition between the two orders. The new density wave represents a transient non-equilibrium phase of matter with no equilibrium counterpart, and this study thus provides a framework for discovering similar states of matter that are ‘trapped’ under equilibrium conditions.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1605171
Grant/Contract Number:  
[GBMF4540; GBMF4541; Skoltech-MIT NGP Program; AC02-76SF00515; AC02-05-CH11231; SC0001088; SC0012509]
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
[ Journal Volume: 16; Journal Issue: 2]; Journal ID: ISSN 1745-2473
Country of Publication:
United States
Language:
English

Citation Formats

Kogar, Anshul, Zong, Alfred, Dolgirev, Pavel E., Shen, Xiaozhe, Straquadine, Joshua, Bie, Ya-Qing, Wang, Xirui, Rohwer, Timm, Tung, I-Cheng, Yang, Yafang, Li, Renkai, Yang, Jie, Weathersby, Stephen, Park, Suji, Kozina, Michael E., Sie, Edbert J., Wen, Haidan, Jarillo-Herrero, Pablo, Fisher, Ian R., Wang, Xijie, and Gedik, Nuh. Light-induced charge density wave in LaTe3. United States: N. p., 2019. Web. doi:10.1038/s41567-019-0705-3.
Kogar, Anshul, Zong, Alfred, Dolgirev, Pavel E., Shen, Xiaozhe, Straquadine, Joshua, Bie, Ya-Qing, Wang, Xirui, Rohwer, Timm, Tung, I-Cheng, Yang, Yafang, Li, Renkai, Yang, Jie, Weathersby, Stephen, Park, Suji, Kozina, Michael E., Sie, Edbert J., Wen, Haidan, Jarillo-Herrero, Pablo, Fisher, Ian R., Wang, Xijie, & Gedik, Nuh. Light-induced charge density wave in LaTe3. United States. doi:10.1038/s41567-019-0705-3.
Kogar, Anshul, Zong, Alfred, Dolgirev, Pavel E., Shen, Xiaozhe, Straquadine, Joshua, Bie, Ya-Qing, Wang, Xirui, Rohwer, Timm, Tung, I-Cheng, Yang, Yafang, Li, Renkai, Yang, Jie, Weathersby, Stephen, Park, Suji, Kozina, Michael E., Sie, Edbert J., Wen, Haidan, Jarillo-Herrero, Pablo, Fisher, Ian R., Wang, Xijie, and Gedik, Nuh. Mon . "Light-induced charge density wave in LaTe3". United States. doi:10.1038/s41567-019-0705-3.
@article{osti_1605171,
title = {Light-induced charge density wave in LaTe3},
author = {Kogar, Anshul and Zong, Alfred and Dolgirev, Pavel E. and Shen, Xiaozhe and Straquadine, Joshua and Bie, Ya-Qing and Wang, Xirui and Rohwer, Timm and Tung, I-Cheng and Yang, Yafang and Li, Renkai and Yang, Jie and Weathersby, Stephen and Park, Suji and Kozina, Michael E. and Sie, Edbert J. and Wen, Haidan and Jarillo-Herrero, Pablo and Fisher, Ian R. and Wang, Xijie and Gedik, Nuh},
abstractNote = {When electrons in a solid are excited by light, they can alter the free energy landscape and access phases of matter that are out of reach in thermal equilibrium. This accessibility becomes important in the presence of phase competition, when one state of matter is preferred over another by only a small energy scale that, in principle, is surmountable by the excitation. Here, we study a layered compound, LaTe3, where a small lattice anisotropy in the a–c plane results in a unidirectional charge density wave (CDW) along the c axis1,2. Using ultrafast electron diffraction, we find that, after photoexcitation, the CDW along the c axis is weakened and a different competing CDW along the a axis subsequently emerges. The timescales characterizing the relaxation of this new CDW and the reestablishment of the original CDW are nearly identical, which points towards a strong competition between the two orders. The new density wave represents a transient non-equilibrium phase of matter with no equilibrium counterpart, and this study thus provides a framework for discovering similar states of matter that are ‘trapped’ under equilibrium conditions.},
doi = {10.1038/s41567-019-0705-3},
journal = {Nature Physics},
number = [2],
volume = [16],
place = {United States},
year = {2019},
month = {11}
}

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