Tailoring the Electronic Structure in Bilayer Molybdenum Disulfide via Interlayer Twist
Authors:
- Arend M. van der ZandeAZArend M. van der Zande
- Jens KunstmannJKJens Kunstmann
- Alexey ChernikovACAlexey Chernikov
- Daniel A. ChenetDCDaniel A. Chenet
- YuMeng YouYYYuMeng You
- XiaoXiao ZhangXZXiaoXiao Zhang
- Pinshane Y. HuangPHPinshane Y. Huang
- Timothy C. BerkelbachTBTimothy C. Berkelbach
- Lei WangLWLei Wang
- Fan ZhangFZFan Zhang
- Mark S. HybertsenMHMark S. Hybertsen
- 19 June 2014
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 14 (7) , 3869-3875
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.Keywords
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