期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.066802
关键词
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资金
- Emergent Phenomena in Quantum Systems Initiative of the Gordon and Betty Moore Foundation [GBMF4547]
- National Science Foundation, Division of Materials Research [NSF-DMR-1507585, NSF-DMR-1006492]
- National Basic Research Program of China [2013CB921901, 2014CB239302]
- Singapore National Research Foundation [NRF-NRFF2013-03]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]
- U.S. DOE [DE-AC02-05CH11231]
- U.S. National Science Foundation GRFP
- University of Central Florida
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1507585] Funding Source: National Science Foundation
The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature and demonstrates a novel type of anomalous surface state, the Fermi arc. Like topological insulators, the bulk topological invariants of a Weyl semimetal are uniquely fixed by the surface states of a bulk sample. Here we present a set of distinct conditions, accessible by angle-resolved photoemission spectroscopy (ARPES), each of which demonstrates topological Fermi arcs in a surface state band structure, with minimal reliance on calculation. We apply these results to TaAs and NbP. For the first time, we rigorously demonstrate a nonzero Chern number in TaAs by counting chiral edge modes on a closed loop. We further show that it is unreasonable to directly observe Fermi arcs in NbP by ARPES within available experimental resolution and spectral linewidth. Our results are general and apply to any new material to demonstrate a Weyl semimetal.
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