Oscillating edge states in one-dimensional MoS2 nanowires

Hai Xu, Shuanglong Liu, Zijing Ding, Sherman J. R. Tan, Kah Meng Yam, Yang Bao, Chang Tai Nai, Man-Fai Ng, Jiong Lu, Chun Zhang and Kian Ping Loh ()
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Hai Xu: National University of Singapore
Shuanglong Liu: National University of Singapore
Zijing Ding: National University of Singapore
Sherman J. R. Tan: National University of Singapore
Kah Meng Yam: National University of Singapore
Yang Bao: National University of Singapore
Chang Tai Nai: National University of Singapore
Man-Fai Ng: Institute of High Performance Computing, Agency for Science, Technology and Research
Jiong Lu: National University of Singapore
Chun Zhang: National University of Singapore
Kian Ping Loh: National University of Singapore

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Reducing the dimensionality of transition metal dichalcogenides to one dimension opens it to structural and electronic modulation related to charge density wave and quantum correlation effects arising from edge states. The greater flexibility of a molecular scale nanowire allows a strain-imposing substrate to exert structural and electronic modulation on it, leading to an interplay between the curvature-induced influences and intrinsic ground-state topology. Herein, the templated growth of MoS2 nanowire arrays consisting of the smallest stoichiometric MoS2 building blocks is investigated using scanning tunnelling microscopy and non-contact atomic force microscopy. Our results show that lattice strain imposed on a nanowire causes the energy of the edge states to oscillate periodically along its length in phase with the period of the substrate topographical modulation. This periodic oscillation vanishes when individual MoS2 nanowires join to form a wider nanoribbon, revealing that the strain-induced modulation depends on in-plane rigidity, which increases with system size.

Date: 2016
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DOI: 10.1038/ncomms12904

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