AUTHOR=Nakanishi Terunobu , Yoshida Shoji , Murase Kota , Takeuchi Osamu , Taniguchi Takashi , Watanabe Kenji , Shigekawa Hidemi , Kobayashi Yu , Miyata Yasumitsu , Shinohara Hisanori , Kitaura Ryo 

TITLE=The Atomic and Electronic Structure of 0° and 60° Grain Boundaries in MoS2

JOURNAL=Frontiers in Physics

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00059

DOI=10.3389/fphy.2019.00059

ISSN=2296-424X

ABSTRACT=<p>We have investigated atomic and electronic structure of grain boundaries in monolayer MoS<sub>2</sub>, where relative angles between two different grains are 0 and 60 degree. The grain boundaries with specific relative angle have been formed with chemical vapor deposition (CVD) growth on graphite and hexagonal boron nitride flakes; van der Waals interlayer interaction between MoS<sub>2</sub> and the flakes restricts the relative angle between two different grains of MoS<sub>2</sub>. Through scanning tunneling microscopy (STM) and spectroscopy measurements, we have found that the perfectly stitched structure between two different grains of MoS<sub>2</sub> was realized in the case of the 0 degree grain boundary. We also found that even with the perfectly stitched structure, valence band maximum (VBM) and conduction band minimum (CBM) shows significant blue shift, which probably arise from lattice strain at the boundary.</p>