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2014 | OriginalPaper | Chapter

5. MoS2: A First-Principles Perspective

Authors : Yingchun Cheng, Udo Schwingenschlögl

Published in: MoS2

Publisher: Springer International Publishing

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Abstract

The structural, electronic, and vibrational properties of MoS2 together with other semiconducting transition metal dichalcogenides (TMDCs) are investigated based on first principles calculations. Due to its layered structure, single-layer MoS2 can be fabricated by the mechanical exfoliation method. The band structure of MoS2 shows an indirect-to-direct semiconductor transition from bulk to single layer because of a lack of interlayer interaction. Giant spin splitting at the K point of the Brillouin zone is predicted for single-layer MoS2 and other TMDCs, due to the intrinsic strong spin–orbit coupling and the absence of inversion symmetry. Moreover, enhancement of the Rashba splitting is predicted for polar single-layer TMDCs. Two-dimensional dilute magnetic semiconductors are proposed for substitution of Mo by other transition metal atoms, such as Mn, Fe, and Co. Experimentally observed anomalous vibrational properties can be attributed to reduction of the interlayer interaction and strengthening of the intralayer interaction from bulk to single layer. It is demonstrated that strain plays an important role for the electronic and vibrational properties of single-layer MoS2. The electronic states of one-dimensional structures (nanoribbon, nanotube, etc.) are sensitive to the edge structure, charity, and strain. Under sulfur-rich conditions, zero-dimensional MoS2 shows a Mo-edge triangular structure with sulfur saturation.

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Metadata
Title
MoS2: A First-Principles Perspective
Authors
Yingchun Cheng
Udo Schwingenschlögl
Copyright Year
2014
DOI
https://doi.org/10.1007/978-3-319-02850-7_5