对解理的MnSn(0001)表面进行扫描隧道显微镜观察。
Scanning tunneling microscopy on cleaved MnSn(0001) surface.
作者信息
Yang Hung-Hsiang, Lee Chi-Cheng, Yoshida Yasuo, Ikhlas Muhammad, Tomita Takahiro, Nugroho Agustinus, Ozaki Taisuke, Nakatsuji Satoru, Hasegawa Yukio
机构信息
Institute for Solid State Physics, the University of Tokyo, 5-1-5, Kashiwa-no-ha, Kashiwa, Chiba, 277-8581, Japan.
Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan.
出版信息
Sci Rep. 2019 Jul 4;9(1):9677. doi: 10.1038/s41598-019-45958-7.
We have studied in-situ cleaved (0001) surfaces of the magnetic Weyl semimetal MnSn by low-temperature scanning tunneling microscopy and spectroscopy (STM/S). It was found that freshly cleaved MnSn surfaces are covered with unknown clusters, and the application of voltage pulses in the tunneling condition was needed to achieve atomically flat surfaces. STM topographs taken on the flat terrace show a bulk-terminated 1 × 1 honeycomb lattice with the Sn site brightest. First-principles calculations reveal that the brightest contrast at the Sn site originates from the surrounding surface Mn d orbitals. Tunneling spectroscopy performed on the as-cleaved and voltage-pulsed surfaces show a prominent semimetal valley near the Fermi energy.
我们通过低温扫描隧道显微镜和光谱学（STM/S）研究了磁性外尔半金属MnSn的原位解理（0001）表面。结果发现，刚解理的MnSn表面覆盖着未知团簇，需要在隧道条件下施加电压脉冲才能获得原子级平整的表面。在平整台面上拍摄的STM形貌图显示出一个体端接的1×1蜂窝晶格，其中Sn位点最亮。第一性原理计算表明，Sn位点处最亮的对比度源于周围的表面Mn d轨道。在解理表面和电压脉冲表面上进行的隧道光谱显示，在费米能量附近有一个突出的半金属谷。
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