title: Ultrafast Optical Microscopy of Single Monolayer Molybdenum Disulfide Flakes.
abstract: We have performed ultrafast optical microscopy on single flakes of atomically thin CVD-grown molybdenum disulfide, using non-degenerate femtosecond pump-probe spectroscopy to excite and probe carriers above and below the indirect and direct band gaps. These measurements reveal the influence of layer thickness on carrier dynamics when probing near the band gap. Furthermore, fluence-dependent measurements indicate that carrier relaxation is primarily influenced by surface-related defect and trap states after above-bandgap photoexcitation. The ability to probe femtosecond carrier dynamics in individual flakes can thus give much insight into light-matter interactions in these two-dimensional nanosystems.
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.|Sensor System Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea.
authors.forename: Minah
authors.initials: M
authors.lastname: Seo
authors.affiliation: Materials Synthesis and Integrated Devices, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Hisato
authors.initials: H
authors.lastname: Yamaguchi
authors.affiliation: Materials Synthesis and Integrated Devices, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Aditya D
authors.initials: AD
authors.lastname: Mohite
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.|Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai 980-8577, Japan.
authors.forename: Stephane
authors.initials: S
authors.lastname: Boubanga-Tombet
authors.affiliation: Physical Chemistry and Applied Spectroscopy, Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Blancon
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Sina
authors.initials: S
authors.lastname: Najmaei
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Lou
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
authors.forename: Antoinette J
authors.initials: AJ
authors.lastname: Taylor
authors.affiliation: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
authors.forename: Rohit P
authors.initials: RP
authors.lastname: Prasankumar