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A stable three-dimensional topological Dirac semimetal Cd3As2

DOI: 10.1038/nmat3990 DOI Help
PMID: 24859642 PMID Help

Authors: Zhongkai Liu (Diamond Light Source) , Juan Jiang (University of Oxford) , Bo Zhou (University of Oxford) , Zhi-jun Wang (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics) , Yi Zhang (Stanford Institute for Materials and Energy Sciences) , Hongming Weng (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics) , D. Prabhakaran (University of Oxford) , Sung-kwan Mo (ALS) , Han Peng (University of Oxford) , Pavel Dudin (Diamond Light Source) , Timur Kim (Diamond Light Source) , Moritz Hoesch (Diamond Light Source) , Zhong Fang (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics) , Xi Dai (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics) , Zhi-xun Shen (Stanford Institute for Materials and Energy Sciences) , Donglai Feng (Fudan University) , Zahid Hussain , Yulin Chen (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Materials , VOL 13 (7) , PAGES 677 - 681

State: Published (Approved)
Published: May 2014

Abstract: Three-dimensional (3D) topological Dirac semimetals (TDSs) are a recently proposed state of quantum matter that have attracted increasing attention in physics and materials science. A 3D TDS is not only a bulk analogue of graphene; it also exhibits non-trivial topology in its electronic structure that shares similarities with topological insulators. Moreover, a TDS can potentially be driven into other exotic phases (such as Weyl semimetals, axion insulators and topological superconductors), making it a unique parent compound for the study of these states and the phase transitions between them. Here, by performing angle-resolved photoemission spectroscopy, we directly observe a pair of 3D Dirac fermions in Cd3As2, proving that it is a model 3D TDS. Compared with other 3D TDSs, for example, รข-cristobalite BiO2 and Na3Bi, Cd3As2 is stable and has much higher Fermi velocities. Furthermore, by in situ doping we have been able to tune its Fermi energy, making it a flexible platform for exploring exotic physical phenomena.

Subject Areas: Physics, Materials


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