Observation of Fermi Arcs in Non-Centrosymmetric Weyl Semi-Metal Candidate NbP
XU Di-Fei1,2, DU Yong-Ping3, WANG Zhen4,5, LI Yu-Peng4,5, NIU Xiao-Hai1,2, YAO Qi1,2, Dudin Pavel6, XU Zhu-An4,5,7,8, WAN Xian-Gang3**, FENG Dong-Lai1,2**
1State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433 2Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433 3National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and College of Physics, Nanjing University, Nanjing 210093 4Department of Physics, Zhejiang University, Hangzhou 310027 5State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027 6Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom 7Zhejiang California International NanoSystems Institute, Zhejiang University, Hangzhou 310027 8Collaborative Innovation Centre of Advanced Microstructures, Nanjing 210093
We report the surface electronic structure of niobium phosphide NbP single crystal on (001) surface by vacuum ultraviolet angle-resolved photoemission spectroscopy. Combining with our first principle calculations, we identify the existence of the Fermi arcs originated from topological surface states. Furthermore, the surface states exhibit circular dichroism pattern, which may correlate with its non-trivial spin texture. Our results provide critical evidence for the existence of the Weyl Fermions in NbP, which lays the foundation for further research.
2015, Vol. 32 
