Surface properties of 3D Weyl semimetal BaMnSb2

ORAL

Abstract

Recently BaMnSb2 was found to be a 3D Weyl semimetal with 2D electronic structure where the Dirac cone was predicted from 1st principles electronic structure calculations to result from the Sb in the square lattice. One of fingerprints of Weyl fermions is the formation of Fermi Arc at the Fermi level, which can be measured by techniques such as ARPES and scanning tunneling microscopy (STM). However, these techniques require an in-depth understanding of the surface properties. Freshly cleaved BaMnSb2 surface was studied using STM and Low energy electron diffraction (LEED). We found two cleavage terminations that are all at Ba layers, but one is above the Sb/Mn layer and the other is above the Sb square lattice. We found although both surfaces show similar 2x1 surface structure reconstructions, their electronic properties are drastically different. Both surfaces are semiconducting with no sign of the Dirac-type cones. The existence of defects can greatly modify the local density of state to create electronic phase separations on the surface. The defects behavior will be discussed based on surface characterization, theoretical calculations and global transport properties.

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Presenters

  • Rongying Jin

    Department of Physics and Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State Univ - Baton Rouge, Department of Physcis and Astronomy, Louisiana State University, Department of Physics & astronomy, Louisiana state University, Department of Physics, Louisiana State University, Louisiana State Univ - Baton Rouge, Physics and Astronomy, Louisiana State University, Physics, Louisiana State Univ, Department of Physics and Astronomy,, Louisiana State Univ - Baton Rouge

Authors

  • Qiang Zou

    Oak Ridge National Laboratory

  • Anthony Yoshimura

    Physics, Applied Physics, and Astronomy, Rensselaer Polytech Inst, Rensselaer Polytechnic Institute

  • Yifan Yang

    Louisiana State Univ - Baton Rouge, Department of Physics and Astronomy, Louisiana State University

  • Kun Zhao

    Louisiana State Univ - Baton Rouge

  • William Shelton

    Cain Department of Chemical Engineering, Louisiana State University, Cain Department of Chemical Engineering, Louisiana state University, Louisiana State Univ - Baton Rouge, Cain Department of Chemical Engineering , Louisiana State University

  • Vincent Meunier

    Rensselaer Polytechnic Institute, Physics, Rensselaer Polytechnic Institute, Physics, Applied Physics, and Astronomy, Rensselaer Polytech Inst

  • E Plummer

    Physics and Astronomy, Louisiana State Univ - Baton Rouge, Department of Physcis and Astronomy, Louisiana State University, Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Dept. of Physics and Astronomy , Louisiana State University, USA, Department of Physics & Astronomy, Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • Rongying Jin

    Department of Physics and Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State Univ - Baton Rouge, Department of Physcis and Astronomy, Louisiana State University, Department of Physics & astronomy, Louisiana state University, Department of Physics, Louisiana State University, Louisiana State Univ - Baton Rouge, Physics and Astronomy, Louisiana State University, Physics, Louisiana State Univ, Department of Physics and Astronomy,, Louisiana State Univ - Baton Rouge

  • Zheng Gai

    Oak Ridge National Laboratory