title: Transient Absorption Measurements on Anisotropic Monolayer ReS2.
abstract: Anisotropic optical and transport properties of monolayer ReS2 fabricated by mechanical exfoliation are reported. Transient absorption measurements with different polarization configurations and sample orientations reveal that the absorption coefficient and transient absorption are both anisotropic, with maximal and minimal values occurring when the light polarization is parallel and perpendicular to the Re atomic chains, respectively. The maximal values are about a factor of 2.5 of the minimal values. By resolving the spatiotemporal dynamics of excitons, it is found that the diffusion coefficient of excitons moving along Re atomic chains is about 16 cm(2) s(-1) at room temperature, which is about a factor of three larger than those moving perpendicular to that direction. An exciton lifetime of 40 ps is also extracted. These findings establish monolayer ReS2 as an anisotropic 2D transition metal dichalcogenide.
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.
authors: Qiannan
authors: Q
authors: Cui
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China.
authors: Jiaqi
authors: J
authors: He
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.
authors: Matthew Z
authors: MZ
authors: Bellus
authors: Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
authors: Mirzojamshed
authors: M
authors: Mirzokarimov
authors: Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.|Department of Physics, Chemistry and Biology (IFM), Linköping, SE-581 83, Linköping, Sweden.
authors: Tino
authors: T
authors: Hofmann
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.
authors: Hsin-Ying
authors: HY
authors: Chiu
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.
authors: Matthew
authors: M
authors: Antonik
authors: Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China.
authors: Dawei
authors: D
authors: He
authors: Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China.
authors: Yongsheng
authors: Y
authors: Wang
authors: Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA.
authors: Hui
authors: H
authors: Zhao
keywords: ReS2; anisotropy; charge transport; transient absorption; transition metal dichalcogenides