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Nat Mater. 2016 Jan;15(1):27-31. doi: 10.1038/nmat4457. Epub 2015 Nov 2.

Evolution of the Fermi surface of Weyl semimetals in the transition metal pnictide family.

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School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China.
CAS-Shanghai Science Research Center, 239 Zhang Heng Road, Shanghai 201203, China.
Diamond Light Source, Didcot, Oxfordshire OX11 0QX, UK.
State Key Laboratory of Low Dimensional Quantum Physics, Collaborative Innovation Center of Quantum Matter and Department of Physics, Tsinghua University, Beijing 100084, China.
Physics Department, Oxford University, Oxford OX1 3PU, UK.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
State Key Laboratory of Functional Materials for Informatics, SIMIT, Chinese Academy of Sciences, Shanghai 200050, China.


Topological Weyl semimetals (TWSs) represent a novel state of topological quantum matter which not only possesses Weyl fermions (massless chiral particles that can be viewed as magnetic monopoles in momentum space) in the bulk and unique Fermi arcs generated by topological surface states, but also exhibits appealing physical properties such as extremely large magnetoresistance and ultra-high carrier mobility. Here, by performing angle-resolved photoemission spectroscopy (ARPES) on NbP and TaP, we directly observed their band structures with characteristic Fermi arcs of TWSs. Furthermore, by systematically investigating NbP, TaP and TaAs from the same transition metal monopnictide family, we discovered their Fermiology evolution with spin-orbit coupling (SOC) strength. Our experimental findings not only reveal the mechanism to realize and fine-tune the electronic structures of TWSs, but also provide a rich material base for exploring many exotic physical phenomena (for example, chiral magnetic effects, negative magnetoresistance, and the quantum anomalous Hall effect) and novel future applications.

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