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Title: Anisotropic charge density wave in layered 1 T - TiS e 2

We present a three-dimensional study on the anisotropy of the charge density wave (CDW) in 1T-TiSe 2, by means of in situ atomically resolved electron microscopy at cryogenic temperatures in both reciprocal and real spaces. Using coherent nanoelectron diffraction, we observed short-range coherence of the in-plane CDW component while the long-range coherence of out-of-plane CDW component remains intact. An in-plane CDW coherence length of ~10 nm and an out-of-plane CDW coherence length of 17.5 nm, as a lower bound, were determined. The electron modulation was observed using electron energy-loss spectroscopy and verified by an orbital-projected density of states. Our integrated approach reveals anisotropic CDW domains at the nanoscale, and illustrates electron modulation-induced symmetry breaking of a two-dimensional material in three dimensions, offering an opportunity to study the effect of reduced dimensionality in strongly correlated systems.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [2] ;  [5] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Temple Univ., Philadephia, PA (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Xiamen Univ. (China)
  5. Drexel Univ., Philadelphia, PA (United States)
  6. Temple Univ., Philadephia, PA (United States)
Publication Date:
Report Number(s):
BNL-200077-2018-JAAM
Journal ID: ISSN 2475-9953; PRMHAR; TRN: US1802022
Grant/Contract Number:
SC0012704; SC0012575
Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 5; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1425060
Alternate Identifier(s):
OSTI ID: 1398155

Qiao, Qiao, Zhou, Songsong, Tao, Jing, Zheng, Jin-Cheng, Wu, Lijun, Ciocys, Samuel T., Iavarone, Maria, Srolovitz, David J., Karapetrov, Goran, and Zhu, Yimei. Anisotropic charge density wave in layered 1T-TiSe2. United States: N. p., Web. doi:10.1103/PhysRevMaterials.1.054002.
Qiao, Qiao, Zhou, Songsong, Tao, Jing, Zheng, Jin-Cheng, Wu, Lijun, Ciocys, Samuel T., Iavarone, Maria, Srolovitz, David J., Karapetrov, Goran, & Zhu, Yimei. Anisotropic charge density wave in layered 1T-TiSe2. United States. doi:10.1103/PhysRevMaterials.1.054002.
Qiao, Qiao, Zhou, Songsong, Tao, Jing, Zheng, Jin-Cheng, Wu, Lijun, Ciocys, Samuel T., Iavarone, Maria, Srolovitz, David J., Karapetrov, Goran, and Zhu, Yimei. 2017. "Anisotropic charge density wave in layered 1T-TiSe2". United States. doi:10.1103/PhysRevMaterials.1.054002. https://www.osti.gov/servlets/purl/1425060.
@article{osti_1425060,
title = {Anisotropic charge density wave in layered 1T-TiSe2},
author = {Qiao, Qiao and Zhou, Songsong and Tao, Jing and Zheng, Jin-Cheng and Wu, Lijun and Ciocys, Samuel T. and Iavarone, Maria and Srolovitz, David J. and Karapetrov, Goran and Zhu, Yimei},
abstractNote = {We present a three-dimensional study on the anisotropy of the charge density wave (CDW) in 1T-TiSe2, by means of in situ atomically resolved electron microscopy at cryogenic temperatures in both reciprocal and real spaces. Using coherent nanoelectron diffraction, we observed short-range coherence of the in-plane CDW component while the long-range coherence of out-of-plane CDW component remains intact. An in-plane CDW coherence length of ~10 nm and an out-of-plane CDW coherence length of 17.5 nm, as a lower bound, were determined. The electron modulation was observed using electron energy-loss spectroscopy and verified by an orbital-projected density of states. Our integrated approach reveals anisotropic CDW domains at the nanoscale, and illustrates electron modulation-induced symmetry breaking of a two-dimensional material in three dimensions, offering an opportunity to study the effect of reduced dimensionality in strongly correlated systems.},
doi = {10.1103/PhysRevMaterials.1.054002},
journal = {Physical Review Materials},
number = 5,
volume = 1,
place = {United States},
year = {2017},
month = {10}
}

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