A5042742754- 2D Materials and Applications
- Perovskite Materials and Applications
- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Mechanical and Optical Resonators
- Quantum and electron transport phenomena
- Cancer therapeutics and mechanisms
- Chemical Synthesis and Analysis
- Organic Chemistry Cycloaddition Reactions
- Graphene research and applications
- Advanced Semiconductor Detectors and Materials
- Nanoplatforms for cancer theranostics
- Topological Materials and Phenomena
- Quinazolinone synthesis and applications
- Catalytic Cross-Coupling Reactions
- Magnetism in coordination complexes
- Eicosanoids and Hypertension Pharmacology
- Crystal Structures and Properties
- Nanocluster Synthesis and Applications
- Catalytic C–H Functionalization Methods
- Asymmetric Hydrogenation and Catalysis
Okinawa Institute of Science and Technology Graduate University
2020-2023
San Jose State University
2023
Resolving the momentum degree of freedom excitons - electron-hole pairs bound by Coulomb attraction in a photoexcited semiconductor, has remained largely elusive goal for decades. In atomically thin semiconductors, such capability could probe forbidden dark excitons, which critically impact proposed opto-electronic technologies, but are not directly accessible via optical techniques. Here, we momentum-state WSe2 monolayer photoemitting their constituent electrons, and resolving them time,...
We visualize the distribution of electron around hole in an exciton and observe its elusive anomalous dispersion.
With rapidly growing photoconversion efficiencies, hybrid perovskite solar cells have emerged as promising contenders for next generation, low-cost photovoltaic technologies. Yet, the presence of nanoscale defect clusters, that form during fabrication process, remains critical to overall device operation, including efficiency and long-term stability. To successfully deploy perovskites, we must understand nature different types defects, assess their potentially varied roles in performance,...
Type-II heterostructures (HSs) are essential components of modern electronic and optoelectronic devices. Earlier studies have found that in type-II transition metal dichalcogenide (TMD) HSs, the dominating carrier relaxation pathway is interlayer charge transfer (CT) mechanism. Here, this report shows that, a HS formed between monolayers MoSe2 ReS2, nonradiative energy (ET) from higher to lower work function material (ReS2 MoSe2) dominates over traditional CT process with without...
Inducing novel quantum phases and topologies in materials using intense light fields is a key objective of modern condensed matter physics, but nonetheless faces significant experimental challenges. Alternately, theory predicts that the dense limit, excitons - collective excitations composed Coulomb-bound electron-hole pairs could also drive exotic phenomena. However, direct observation these phenomena requires resolution electronic structure momentum space presence excitons, which became...
Floquet engineering, in which a temporal periodic drive breaks the continuous symmetry and dynamically engineers electronic structure, has attracted enormous attention condensed matter physics. However, only handful of studies have experimentally demonstrated effects driven by optical fields [5,6]. In this talk, we will discuss experimental observation Floquet-Bloch states induced excitons 2D semiconductors.
Interlayer excitons (ILXs) - electron-hole pairs bound across two atomically thin layered semiconductors have emerged as attractive platforms to study exciton condensation, single-photon emission and other quantum-information applications. Yet, despite extensive optical spectroscopic investigations, critical information about their size, valley configuration the influence of moiré potential remains unknown. Here, we captured images time- momentum-resolved distribution both electron hole that...
We use a table-top time-resolved ARPES based on MHz XUV source to directly observe direct and momentum-forbidden excitons in the full first Brillouin zone of WSe 2 monolayer measure their ultrafast dynamics.
We observe Floquet states driven by the time-periodic oscillations in self-energy due to an exciton a monolayer Van der Waals semiconductor.
We use a table-top time-resolved ARPES based on MHz XUV source to directly observe direct and momentum-forbidden excitons in the full first Brillouin zone of WSe 2 monolayer measure their ultrafast dynamics.
An exciton, a two-body composite quasiparticle formed of an electron and hole, is fundamental optical excitation in condensed-matter systems. Since its discovery nearly century ago, measurement the excitonic wavefunction has remained beyond experimental reach. Here, we directly image reciprocal space by measuring momentum distribution electrons photoemitted from excitons monolayer WSe2. By transforming to real space, obtain visual around hole exciton. Further, also resolving energy...
Using time- and angle-resolved photoemission spectroscopy on a microscopic sample of 2D semiconductor, we visualized directly the excitonic wavefunction in real- momentum-space.
Newly emerging transition metal dichalcogenide (TMD) materials have gained significant interest in last decade due to their unique quantum properties monolayer regime.
With rapidly growing photoconversion efficiencies, hybrid perovskite solar cells have emerged as promising contenders for next generation, low-cost photovoltaic technologies. Yet, the presence of nanoscale defect clusters, that form during fabrication process, remains critical to overall device operation, including efficiency and long-term stability. To successfully deploy perovskites, we must understand nature different types defects, assess their potentially varied roles in performance,...
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