Janus monolayers of transition metal dichalcogenides.

@article{Lu2017JanusMO,
  title={Janus monolayers of transition metal dichalcogenides.},
  author={Ang-Yu Lu and Hanyu Zhu and Jun Xiao and Chih-Piao Chuu and Yimo Han and Ming-Hui Chiu and Chia-Chin Cheng and Chi-Wen Yang and Kung‐Hwa Wei and Yiming Yang and Yuan Wang and Dimosthenis Sokaras and Dennis Nordlund and Peidong Yang and David A. Muller and Mei-Yin Chou and Xiang Zhang and Lain‐Jong Li},
  journal={Nature nanotechnology},
  year={2017},
  volume={12 8},
  pages={
          744-749
        }
}
Structural symmetry-breaking plays a crucial role in determining the electronic band structures of two-dimensional materials. Tremendous efforts have been devoted to breaking the in-plane symmetry of graphene with electric fields on AB-stacked bilayers or stacked van der Waals heterostructures. In contrast, transition metal dichalcogenide monolayers are semiconductors with intrinsic in-plane asymmetry, leading to direct electronic bandgaps, distinctive optical properties and great potential in… 
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