ARPES study on a stable three-dimensional topological Dirac semimetal Cd3As2

ORAL

Abstract

Three-dimensional topological Dirac semimetal (TDS) is a new state of quantum matter recently proposed and has attracted increasing attention in physics and material science. A 3D TDS not only is a bulk analogue of graphene, but also shows non-trivial topology in its electronic structure. A TDS can also be driven into other novel states with symmetry breaking, making it a unique ``mother compound'' for the study of these states. By performing angle-resolved photoemission spectroscopy, we directly observed a pair of 3D Dirac fermions in Cd3As2, proving that it is a model 3D TDS. Comparing to other 3D TDSs, Cd3As2 is stable and have much higher Fermi velocities. Furthermore, by in-situ doping, we were able to tune its Fermi-energy, making it a flexible platform for exploring exotic physical phenomena and application potentials.

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Authors

  • Zhongkai Liu

    • Diamond Light Source Ltd

  • Juan Jiang

    • Fudan University

  • Bo Zhou

    • Oxford University

  • Zhijun Wang

    • Chinese Academy of Sciences

  • Yi Zhang

    • Lawrence Berkeley National Laboratory

  • Hongming Weng

    • Chinese Academy of Sciences

  • Dharmalingam Prabhakaran

    • Oxford University

  • Sung-Kwan Mo

    • Lawrence Berkeley National Laboratory

  • Han Peng

    • Oxford University

  • Pavel Dubin

    • Diamond Light Source Ltd

  • Timur Kim

    • Diamond Light Source Ltd

  • Moritz Hoesch

    • Diamond Light Source Ltd

  • Zhong Fang

    • Chinese Academy of Sciences

  • Xi Dai

    • Chinese Academy of Sciences

  • Zhi-Xun Shen

    • Stanford University

  • Donglai Feng

    • Fudan University

  • Zahid Hussain

    • Lawrence Berkeley National Laboratory

  • Yulin Chen

    • Oxford University