title: Spectroscopic Signatures of AA' and AB Stacking of Chemical Vapor Deposited Bilayer MoS2.
abstract: Prominent resonance Raman and photoluminescence spectroscopic differences between AA' and AB stacked bilayer molybdenum disulfide (MoS2) grown by chemical vapor deposition are reported. Bilayer MoS2 islands consisting of the two stacking orders were obtained under identical growth conditions. Resonance Raman and photoluminescence spectra of AA' and AB stacked bilayer MoS2 were obtained on Au nanopyramid surfaces under strong plasmon resonance. Both resonance Raman and photoluminescence spectra show distinct features indicating clear differences in interlayer interaction between these two phases. The implication of these findings on device applications based on spin and valley degrees of freedom will be discussed.
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Ming
authors.initials: M
authors.lastname: Xia
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.affiliation: SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University , Nanjing 210096, China.|Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Kuibo
authors.initials: K
authors.lastname: Yin
authors.affiliation: Innovations for High Performance (IHP) , ImTechnologiepark 25, Frankfurt D-15236, Germany.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Capellini
authors.affiliation: Innovations for High Performance (IHP) , ImTechnologiepark 25, Frankfurt D-15236, Germany.
authors.forename: Gang
authors.initials: G
authors.lastname: Niu
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Yongji
authors.initials: Y
authors.lastname: Gong
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Wu
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Ya-Hong
authors.initials: YH
authors.lastname: Xie
keywords: Au nanopyramids; bilayer stacking; molybdenum disulfide; photoluminescence; resonance Raman