Evolution of interlayer coupling in twisted molybdenum disulfide bilayers

Kaihui Liu, Liming Zhang, Ting Cao, Chenhao Jin, Diana Qiu, Qin Zhou, Alex Zettl, Peidong Yang, Steve G. Louie and Feng Wang ()
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Kaihui Liu: University of California at Berkeley
Liming Zhang: University of California at Berkeley
Ting Cao: University of California at Berkeley
Chenhao Jin: University of California at Berkeley
Diana Qiu: University of California at Berkeley
Qin Zhou: Lawrence Berkeley National Laboratory
Alex Zettl: University of California at Berkeley
Peidong Yang: University of California at Berkeley
Steve G. Louie: University of California at Berkeley
Feng Wang: University of California at Berkeley

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Van der Waals coupling is emerging as a powerful method to engineer physical properties of atomically thin two-dimensional materials. In coupled graphene–graphene and graphene–boron nitride layers, interesting physical phenomena ranging from Fermi velocity renormalization to Hofstadter’s butterfly pattern have been demonstrated. Atomically thin transition metal dichalcogenides, another family of two-dimensional-layered semiconductors, can show distinct coupling phenomena. Here we demonstrate the evolution of interlayer coupling with twist angles in as-grown molybdenum disulfide bilayers. We find that the indirect bandgap size varies appreciably with the stacking configuration: it shows the largest redshift for AA- and AB-stacked bilayers, and a significantly smaller but constant redshift for all other twist angles. Our observations, together with ab initio calculations, reveal that this evolution of interlayer coupling originates from the repulsive steric effects that leads to different interlayer separations between the two molybdenum disulfide layers in different stacking configurations.

Date: 2014
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DOI: 10.1038/ncomms5966

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