Ultrafast carrier dynamics in a monolayer MoS2 at carrier densities well above Mott density. (13th April 2022)

• Record Type: Journal Article
• Authors: Khatua, Durga Prasad; Singh, Asha; Gurung, Sabina; Khan, Salahuddin; Tanwar, Manushree; Kumar, Rajesh; Jayabalan, J
• Is Part Of: Journal of physics. Volume 34:Number 15(2022)
• Publication Date: 2022-04-13
• Subjects: monolayer MoS2 -- band gap renormalization -- ultrafast carrier dynamics; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac4dbf
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Due to the growing interest in monolayer (ML) molybdenum disulfide (MoS2 ) in several optoelectronic applications like lasers, detectors, sensors, it is important to understand the ultrafast behavior of the excited carriers in this material. In this article, a comprehensive study of the charge carrier dynamics of a monolayer MoS2 flake has been studied using transient transmission technique near A-exciton under high excitation densities well above the Mott density. Fluence dependent studies has been carried out to understand the origin of the processes which modifies its optical response under excitation. The dissociation of excitons leads to an observed fast bandgap renormalization. At later times when large number of carriers relax the remaining carriers forms excitons leading to a bleaching effect.