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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. In this paper, 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 axis. 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. Lastly, 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:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [5];  [1]; ORCiD logo [6]; ORCiD logo [7];  [1]; ORCiD logo [3]; ORCiD logo [3];  [3];  [8];  [3]; ORCiD logo [4]; ORCiD logo [7]; ORCiD logo [1];  [4]; ORCiD logo [3] more »; ORCiD logo [1] « less
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Harvard Univ., Cambridge, MA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Sun Yat-sen Univ., Guangzhou, Guangdong (China)
  6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation (GBMF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1605171
Alternate Identifier(s):
OSTI ID: 1616273
Grant/Contract Number:  
GBMF4540; GBMF4541; AC02-76SF00515; AC02-05CH11231; SC0001088; SC0012509; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 16; Journal Issue: 2; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electronic properties and materials; Phase transitions and critical phenomena

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:https://doi.org/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:https://doi.org/10.1038/s41567-019-0705-3. https://www.osti.gov/servlets/purl/1605171.
@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. In this paper, 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 axis. 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. Lastly, 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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