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

DOI: 10.1038/nmat4457 DOI Help
PMID: 26524130 PMID Help

Authors: Z. K. Liu (ShanghaiTech University, Diamond Light Source) , Lexian Yang (Tsinghua University; Oxford University) , Y. Sun (Max Planck Institute for Chemical Physics of Solids) , T. Zhang (Tsinghua University) , Han Peng (University of Oxford) , H. F. Yang (Oxford University) , C. Chen (ShanghaiTech University) , Y. Zhang (Advanced Light Source) , Y F Guo (ShanghaiTech University) , D. Prabhakaran (University of Oxford) , M. Schmidt (Max Planck Institute for Chemical Physics of Solids) , Z. Hussain (Advanced Light Source) , S K Mo (Advanced Light Source) , C. Felser (Max Planck Institute for Chemical Physics of Solids) , B. Yan (ShanghaiTech University) , Y. L. Chen (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Materials

State: Published (Approved)
Published: November 2015
Diamond Proposal Number(s): 13026 , 13177

Abstract: 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.

Subject Areas: Physics

Instruments: I05-ARPES

Other Facilities: Advanced Light Source, US