title: Modulating Photoluminescence of Monolayer Molybdenum Disulfide by Metal-Insulator Phase Transition in Active Substrates.
abstract: The atomic thickness and flatness allow properties of 2D semiconductors to be modulated with influence from the substrate. Reversible modulation of these properties requires an "active," reconfigurable substrate, i.e., a substrate with switchable functionalities that interacts strongly with the 2D overlayer. In this work, the photoluminescence (PL) of monolayer molybdenum disulfide (MoS2 ) is modulated by interfacing it with a phase transition material, vanadium dioxide (VO2 ). The MoS2 PL intensity is enhanced by a factor of up to three when the underlying VO2 undergoes the thermally driven phase transition from the insulating to metallic phase. A nonvolatile, reversible way to rewrite the PL pattern is also demonstrated. The enhancement effect is attributed to constructive optical interference when the VO2 turns metallic. This modulation method requires no chemical or mechanical processes, potentially finding applications in new switches and sensors.
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Jiwei
authors.initials: J
authors.lastname: Hou
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
authors.forename: Xi
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
authors.forename: Deyi
authors.initials: D
authors.lastname: Fu
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
authors.forename: Changhyun
authors.initials: C
authors.lastname: Ko
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
authors.forename: Yabin
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Korea.
authors.forename: Sangwook
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
authors.forename: Kevin X
authors.initials: KX
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.|Department of Precision Instrument, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Kaichen
authors.initials: K
authors.lastname: Dong
authors.affiliation: Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.
authors.forename: Sefaattin
authors.initials: S
authors.lastname: Tongay
authors.affiliation: Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Liying
authors.initials: L
authors.lastname: Jiao
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.|Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Yao
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.|Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
authors.forename: Junqiao
authors.initials: J
authors.lastname: Wu
keywords: interference; molybdenum disulfide; phase transition; photoluminescence; vanadium dioxide