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    exciton tagged posts

    Team Manages to Dynamically Control Trions with a Waveguide

    May 17, 2023, Categories  Physics, Technology/Electronics

    Fig. 1
     Illustration of propagating SPP and exciton-to-trion conversion with dynamic optical modulation. a Schematic diagram of all-optical trion control platform operating with adaptive optical excitation. Green dashed line indicates transferred MoS2 ML. b Illustration of all-optical trion control platform facilitated by nanoscale strain gradient, plasmon-induced hot electrons, and resultant exciton-to-trion conversion. c Illustration of hot electron injection process from Au to MoS2 ML in SPP mode. d Strain (ϵ) and corresponding bandgap energy change (ΔE) diagram of MoS2 ML as function of distance x, where gray region indicates nanogap area. e Adaptive wavefront shaping using stepwise sequence feedback algorithm to find optimal phase mask (left) and dynamic excitonic emission modulation thro...
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    Measuring a Tiny Quasiparticle is a major step forward for Semiconductor Technology

    June 23, 2020, Categories  Physics, Technology/Electronics

    PL spectra of BN encapsulated monolayer WSe2 at 4.2 K. Credit: Nature Communications (2020). DOI: 10.1038/s41467-020-16934-x

    A team of researchers led by Sufei Shi, an assistant professor of chemical and biological engineering at Rensselaer Polytechnic Institute, has uncovered new information about the mass of individual components that make up a promising quasiparticle, known as an exciton, that could play a critical role in future applications for quantum computing, improved memory storage, and more efficient energy conversion.

    Published today in Nature Communications, the team’s work brings researchers one step closer to advancing the development of semiconductor devices by deepening their understanding of an atomically thin class of materials known as transitional metal dichal...

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    Laser Spectroscopy of Ultrathin Semiconductor reveals rise of ‘Trion’ Quasiparticles: central to Energy Apps

    October 8, 2015, Categories  Physics, Technology/Electronics

    In a pump-probe experiment, the pump laser pulse first excites the 2D material, and later, at controllable time-delays, the probe laser pulse returns to the energy-pumped site to provide information about the evolution of the pump’s effect on the material. In the ORNL experiment, absorption of pumped energy first generated two excitons, X1 and X2. Dissociation of these excitons through hole trapping at the substrate freed their electrons. Then the arriving probe pulse generated new electron–hole pairs, which joined the remaining free electrons to form trions T1 and T2. Credit: Oak Ridge National Laboratory, U.S. Dept. of Energy

    In a pump-probe experiment, the pump laser pulse first excites the 2D material, and later, at controllable time-delays, the probe laser pulse returns to the energy-pumped site to provide information about the evolution of the pump’s effect on the material. In the ORNL experiment, absorption of pumped energy first generated two excitons, X1 and X2. Dissociation of these excitons through hole trapping at the substrate freed their electrons. Then the arriving probe pulse generated new electron–hole pairs, which joined the remaining free electrons to form trions T1 and T2. Credit: Oak Ridge National Laboratory, U.S. Dept. of Energy

    Quasiparticles – excitations that behave collectively like particles – can be difficult to detect...

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