207 citations · 435 across the 9 of their papers we have counts for
9 papers
Momentum Conserved Ultrafast Charge Transfer Dynamics of Interlayer Excitons in vdW Heterostructures
Pranjal Kumar Gogoi, Yung-Chang Lin, Ryosuke Senga +9
Heterostructures comprising van der Waals (vdW) stacked transition metal dichalcogenide (TMDC) monolayers are a fascinating class of two-dimensional (2D) materials with unique prop…
Point Defects and Localized Excitons in 2D WSe2
Yu Jie Zheng, Yifeng Chen, Yu Li Huang +8
Identifying the point defects in 2D materials is important for many applications. Recent studies have proposed that W vacancies are the predominant point defect in 2D WSe2, in cont…
Temperature-dependent dielectric function of bulk SrTiO: Urbach tail, band edges, and excitonic effects
Pranjal Kumar Gogoi, Daniel Schmidt
We report the temperature-dependent complex dielectric function of pristine bulk SrTiO between 4.2 and 300 K within the energy range of 0.6-6.5 eV determined by spectroscopic e…
Anomalous excitons and screenings unveiling strong electronic correlations in SrTiNbO, 0x0.005
Pranjal Kumar Gogoi, Lorenzo Sponza, Daniel Schmidt +8
Electron-electron (e-e) and electron-hole (e-h) interactions are often associated with many exotic phenomena in correlated electron systems. Here, we report an observation of anoma…
Temperature-dependent and anisotropic optical response of layered PrCaMnO probed by spectroscopic ellipsometry
M. A. Majidi, E. Thoeng, P. K. Gogoi +9
We study the temperature dependence as well as anisotropy of optical conductivity () in the pseudocubic single crystal PrCaMnO using spectrocopic ellipso…
Mechanisms of charge transfer and redistribution in LaAlO3/SrTiO3 revealed by high-energy optical conductivity
T. C. Asmara, A. Annadi, I. Santoso +9
In condensed matter physics the quasi two-dimensional electron gas at the interface of two different insulators, polar LaAlO3 on non-polar SrTiO3 (LaAlO3/SrTiO3) is a spectacular a…
Optical conductivity renormalization of graphene on SrTiO due to resonant excitonic effects mediated by Ti 3\textit{d} orbitals
Pranjal Kumar Gogoi, Paolo E. Trevisanutto, Ming Yang +10
We present evidence of a drastic renormalization of the optical conductivity of graphene on SrTiO resulting in almost full transparency in the ultraviolet region. These finding…
Tunable optical absorption and interactions in graphene via oxygen plasma
Iman Santoso, Ram Sevak Singh, Pranjal Kumar Gogoi +6
We report significant changes of optical conductivity in single layer graphene induced by mild oxygen plasma exposure, and explore the interplay between carrier doping, disorder, a…
Optical conductivity study of screening of many-body effects in graphene interfaces
Pranjal Kumar Gogoi, Iman Santoso, Surajit Saha +5
Theoretical studies have shown that electron-electron (e-e) and electron-hole (e-h) interactions play important roles in many observed quantum properties of graphene making this an…