Tailoring the Electronic Structure in Bilayer Molybdenum Disulfide via Interlayer Twist
Nano Letters2014Vol. 14(7), pp. 3869–3875
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Arend M. van der Zande, Jens Kunstmann, Alexey Chernikov, Daniel Chenet, Yu‐Meng You, Xiaoxiao Zhang, Pinshane Y. Huang, Timothy C. Berkelbach, Lei Wang, Fan Zhang, Mark S. Hybertsen, David A. Muller, David R. Reichman, Tony F. Heinz, James Hone
Abstract
Molybdenum disulfide bilayers with well-defined interlayer twist angle were constructed by stacking single-crystal monolayers. Varying interlayer twist angle results in strong tuning of the indirect optical transition energy and second-harmonic generation and weak tuning of direct optical transition energies and Raman mode frequencies. Electronic structure calculations show the interlayer separation changes with twist due to repulsion between sulfur atoms, resulting in shifts of the indirect optical transition energies. These results show that interlayer alignment is a crucial variable in tailoring the properties of two-dimensional heterostructures.
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