title: Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy.
abstract: Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Shengxi
authors.initials: S
authors.lastname: Huang
authors.forename: Xi
authors.initials: X
authors.lastname: Ling
authors.forename: Liangbo
authors.initials: L
authors.lastname: Liang
authors.forename: Jing
authors.initials: J
authors.lastname: Kong
authors.forename: Humberto
authors.initials: H
authors.lastname: Terrones
authors.forename: Vincent
authors.initials: V
authors.lastname: Meunier
authors.forename: Mildred S
authors.initials: MS
authors.lastname: Dresselhaus
mesh_terms: D004220:Disulfides / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D008958:Models, Molecular; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D004220:Disulfides; D008982:Molybdenum; C082964:molybdenum disulfide
keywords: Molybdenum disulfide; exciton; interlayer coupling; photoluminescence; trion; twisted bilayer