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Title: Experimental discovery of a topological Weyl semimetal state in TaP

Abstract

Here, Weyl semimetals are expected to open up new horizons in physics and materials science because they provide the first realization of Weyl fermions and exhibit protected Fermi arc surface states. However, they had been found to be extremely rare in nature. Recently, a family of compounds, consisting of tantalum arsenide, tantalum phosphide (TaP), niobium arsenide, and niobium phosphide, was predicted as a Weyl semimetal candidates. We experimentally realize a Weyl semimetal state in TaP. Using photoemission spectroscopy, we directly observe the Weyl fermion cones and nodes in the bulk, and the Fermi arcs on the surface. Moreover, we find that the surface states show an unexpectedly rich structure, including both topological Fermi arcs and several topologically trivial closed contours in the vicinity of the Weyl points, which provides a promising platform to study the interplay between topological and trivial surface states on a Weyl semimetal’s surface. We directly demonstrate the bulk-boundary correspondence and establish the topologically nontrivial nature of the Weyl semimetal state in TaP, by resolving the net number of chiral edge modes on a closed path that encloses the Weyl node. This also provides, for the first time, an experimentally practical approach to demonstrating a bulk Weylmore » fermion from a surface state dispersion measured in photoemission.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [1];  [2];  [2];  [4];  [1];  [5];  [1];  [1];  [3];  [3];  [6];  [7];  [3];  [8] more »;  [9];  [1];  [5];  [3];  [10];  [1] « less
  1. Princeton Univ., Princeton, NJ (United States)
  2. Peking Univ., Beijing (China)
  3. National Univ. of Singapore (Singapore)
  4. National Tsing Hua Univ., Hsinchu (Taiwan)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan)
  7. National Taiwan Univ., Taipei (Taiwan)
  8. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  9. Northeastern Univ., Boston, MA (United States)
  10. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Publication Date:
Research Org.:
Northeastern Univ., Boston, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1434896
Grant/Contract Number:  
FG02-07ER46352
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 1; Journal Issue: 10; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Weyl Fermion; Fermi arc; Topological physics; Weyl semimetal; Topological insulator

Citation Formats

Xu, Su -Yang, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Chenglong, Chang, Guoqing, Guo, Cheng, Bian, Guang, Yuan, Zhujun, Lu, Hong, Chang, Tay -Rong, Shibayev, Pavel P., Prokopovych, Mykhailo L., Alidoust, Nasser, Zheng, Hao, Lee, Chi -Cheng, Huang, Shin -Ming, Sankar, Raman, Chou, Fangcheng, Hsu, Chuang -Han, Jeng, Horng -Tay, Bansil, Arun, Neupert, Titus, Strocov, Vladimir N., Lin, Hsin, Jia, Shuang, and Hasan, M. Zahid. Experimental discovery of a topological Weyl semimetal state in TaP. United States: N. p., 2015. Web. doi:10.1126/sciadv.1501092.
Xu, Su -Yang, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Chenglong, Chang, Guoqing, Guo, Cheng, Bian, Guang, Yuan, Zhujun, Lu, Hong, Chang, Tay -Rong, Shibayev, Pavel P., Prokopovych, Mykhailo L., Alidoust, Nasser, Zheng, Hao, Lee, Chi -Cheng, Huang, Shin -Ming, Sankar, Raman, Chou, Fangcheng, Hsu, Chuang -Han, Jeng, Horng -Tay, Bansil, Arun, Neupert, Titus, Strocov, Vladimir N., Lin, Hsin, Jia, Shuang, & Hasan, M. Zahid. Experimental discovery of a topological Weyl semimetal state in TaP. United States. doi:10.1126/sciadv.1501092.
Xu, Su -Yang, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Chenglong, Chang, Guoqing, Guo, Cheng, Bian, Guang, Yuan, Zhujun, Lu, Hong, Chang, Tay -Rong, Shibayev, Pavel P., Prokopovych, Mykhailo L., Alidoust, Nasser, Zheng, Hao, Lee, Chi -Cheng, Huang, Shin -Ming, Sankar, Raman, Chou, Fangcheng, Hsu, Chuang -Han, Jeng, Horng -Tay, Bansil, Arun, Neupert, Titus, Strocov, Vladimir N., Lin, Hsin, Jia, Shuang, and Hasan, M. Zahid. Fri . "Experimental discovery of a topological Weyl semimetal state in TaP". United States. doi:10.1126/sciadv.1501092. https://www.osti.gov/servlets/purl/1434896.
@article{osti_1434896,
title = {Experimental discovery of a topological Weyl semimetal state in TaP},
author = {Xu, Su -Yang and Belopolski, Ilya and Sanchez, Daniel S. and Zhang, Chenglong and Chang, Guoqing and Guo, Cheng and Bian, Guang and Yuan, Zhujun and Lu, Hong and Chang, Tay -Rong and Shibayev, Pavel P. and Prokopovych, Mykhailo L. and Alidoust, Nasser and Zheng, Hao and Lee, Chi -Cheng and Huang, Shin -Ming and Sankar, Raman and Chou, Fangcheng and Hsu, Chuang -Han and Jeng, Horng -Tay and Bansil, Arun and Neupert, Titus and Strocov, Vladimir N. and Lin, Hsin and Jia, Shuang and Hasan, M. Zahid},
abstractNote = {Here, Weyl semimetals are expected to open up new horizons in physics and materials science because they provide the first realization of Weyl fermions and exhibit protected Fermi arc surface states. However, they had been found to be extremely rare in nature. Recently, a family of compounds, consisting of tantalum arsenide, tantalum phosphide (TaP), niobium arsenide, and niobium phosphide, was predicted as a Weyl semimetal candidates. We experimentally realize a Weyl semimetal state in TaP. Using photoemission spectroscopy, we directly observe the Weyl fermion cones and nodes in the bulk, and the Fermi arcs on the surface. Moreover, we find that the surface states show an unexpectedly rich structure, including both topological Fermi arcs and several topologically trivial closed contours in the vicinity of the Weyl points, which provides a promising platform to study the interplay between topological and trivial surface states on a Weyl semimetal’s surface. We directly demonstrate the bulk-boundary correspondence and establish the topologically nontrivial nature of the Weyl semimetal state in TaP, by resolving the net number of chiral edge modes on a closed path that encloses the Weyl node. This also provides, for the first time, an experimentally practical approach to demonstrating a bulk Weyl fermion from a surface state dispersion measured in photoemission.},
doi = {10.1126/sciadv.1501092},
journal = {Science Advances},
number = 10,
volume = 1,
place = {United States},
year = {2015},
month = {11}
}

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