Experimental discovery of a topological Weyl semimetal state in TaP.
- Xu SY Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Belopolski I Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Sanchez DS Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Zhang C International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
- Chang G Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore. ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
- Guo C International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
- Bian G Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Yuan Z International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
- Lu H International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
- Chang TR Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
- Shibayev PP Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Prokopovych ML Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
- Alidoust N Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Zheng H Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
- Lee CC Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore. ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
- Huang SM Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore. ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
- Sankar R Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan. ; Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.
- Chou F Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
- Hsu CH Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore. ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
- Jeng HT Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan. ; Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.
- Bansil A Department of Physics, Northeastern University, Boston, MA 02115, USA.
- Neupert T Princeton Center for Theoretical Science, Princeton University, Princeton, NJ 08544, USA.
- Strocov VN Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
- Lin H Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore. ; Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
- Jia S International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China. ; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
- Hasan MZ Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA. ; Princeton Center for Complex Materials, Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ 08544, USA.
- 2015-12-25
Published in:
- Science advances. - 2015
English
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.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1126/sciadv.1501092
- PMID 26702446
- Persistent URL
- https://sonar.ch/global/documents/77310
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