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Article overview
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Continuously tunable electronic structure of transition metal dichalcogenides superlattices | | Yong-Hong Zhao
; Feng Yang
; Jian Wang
; Hong Guo
; Wei Ji
; | | Date: |
28 Oct 2013 | | Abstract: | Two dimensional transition metal dichalcogenides (TMDC) have very interesting
properties for optoelectronic devices. In this work we theoretically
investigate and predict that superlattices comprised of MoS$_{2}$ and WSe$_{2}$
multilayers possess continuously tunable electronic structure having direct
band gap. The tunability is controlled by the thickness ratio of MoS$_{2}$
versus WSe$_{2}$ of the superlattice. When this ratio goes from 1:2 to 5:1, the
dominant K-K direct band gap is continuously tuned from 0.14 eV to 0.5 eV. The
gap stays direct against -0.6% to 2% in-layer strain and up to -4.3%
normal-layer compressive strain. The valance and conduction bands are spatially
separated. These robust properties suggest that MoS$_{2}$ and WSe$_{2}$
multilayer superlattice should be an exciting emerging material for infrared
optoelectronics. | | Source: | arXiv, 1310.7285 | | Services: | Forum | Review | PDF | Favorites | |
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