Exploration of two surfaces observed in Weyl semimetal BaMnSb2

Qiang Zou, Silu Huang, Wonhee Ko, Mingming Fu, Yifan Yang, Kun Zhao, Scott R. Crittenden, E. W. Plummer, Rongying Jin, Zheng Gai

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Abstract

Single crystalline BaMnSb2 is considered as a 3D Weyl semimetal with the 2D electronic structure containing Dirac cones from the Sb sheet. We report experimental investigation of low-temperature cleaved BaMnSb2 surfaces using scanning tunneling microscopy/spectroscopy and low energy electron diffraction. By natural cleavage, we find two terminations: one is Ba (above the orthorhombically distorted Sb sheet) and another Sb2 (at the surface of the Sb/Mn/Sb sandwich layer). Both terminations show the 2 × 1 surface reconstructions, with drastically different morphologies and electronic properties, however. The reconstructed structures, defect types and nature of the electronic structures of the two terminations are extensively studied. The quasiparticle interference (QPI) analysis is conducted at the energy range between −2 V and 2 V, although no interesting states are observed near the Fermi level, the surface-projected electronic band structures strongly depend on the surface termination above 1.6 V. The existence of defects can greatly modify the local density of states to create electronic phase separations on the surface in the order of tens of nm scale. Our observation on the atomic structures of the terminations and the corresponding electronic structures provides critical information towards an understanding of topological properties of BaMnSb2.

Original languageEnglish
Article number85
Journalnpj Quantum Materials
Volume7
Issue number1
DOIs
StatePublished - Dec 2022

Funding

The STM work of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Work at LSU and USC was supported by NSF DMR-1504226. The STM work of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Work at LSU and USC was supported by NSF DMR-1504226.

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