Journal
ANNALEN DER PHYSIK
Volume 526, Issue 9-10, Pages 347-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/andp.201400128
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Funding
- MINECO, Spain [FIS2011-23713]
- European Union [290846]
- Juan de la Cierva Program (MINECO, Spain)
- European project FP7-PEOPLE-CIG LSIE_2D
- Italian National Miur Prin project [20105ZZTSE]
- Spanish MINECO [FIS2012-37549-C05-02]
- FEDER Funds from the European Union [CSD2007-00050]
- FPI Fellowship from MINECO
- [2014 SGR 301]
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Single- and few-layer transition metal dichalcogenides have recently emerged as a new family of layered crystals with great interest , not only from the fundamental point of view, but also because of their potential application in ultrathin devices. Here the electronic properties of semiconducting MX2, where M =Mo or W and X = S or Se, are reviewed. Based on of density functional theory calculations, which include the effect of spin-orbit interaction, the band structure of single-layer, bilayer and bulk compounds is discussed. The band structure of these compounds is highly sensitive to elastic deformations, and it is reviewed how strain engineering can be used to manipulate and tune the electronic and optical properties of those materials. Further, the effect of disorder and imperfections in the lattice structure and their effect on the optical and transport properties of MX2 is discussed. The superconducting transition in these compounds, which has been observed experimentally, is analyzed, as well as the different mechanisms proposed so far to explain the pairing. Finally, a discussion on the excitonic effects which are present in these systems is included.
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