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View article: Long-lived photoinduced polar states in metal halide perovskites
Long-lived photoinduced polar states in metal halide perovskites Open
Ferroic polarization in hybrid perovskites is crucial for enhancing photovoltaic performance and developing potential electronic applications. Controlling ferroic polarization with an optical field enables probing of ferroic polarization w…
View article: 3d Printed Water-Stable Cd-Doped Cs4mnbi2cl12/Polylactic Acid Perovskite/Polymer Composites for Enhanced X-Ray Scintillation
3d Printed Water-Stable Cd-Doped Cs4mnbi2cl12/Polylactic Acid Perovskite/Polymer Composites for Enhanced X-Ray Scintillation Open
View article: Ultrafast Symmetry Control in Photoexcited Quantum Dots
Ultrafast Symmetry Control in Photoexcited Quantum Dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: Nonresonant Raman control of ferroelectric polarization
Nonresonant Raman control of ferroelectric polarization Open
Important advances have recently been made in the search for materials with complex multi-phase landscapes that host photoinduced metastable collective states with exotic functionalities. In almost all cases so far, the desired phases are …
View article: Ultrafast symmetry control in photoexcited quantum dots
Ultrafast symmetry control in photoexcited quantum dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: Optical Control of Adaptive Nanoscale Domain Networks
Optical Control of Adaptive Nanoscale Domain Networks Open
Adaptive networks can sense and adjust to dynamic environments to optimize their performance. Understanding their nanoscale responses to external stimuli is essential for applications in nanodevices and neuromorphic computing. However, it …
View article: Optical Control of Adaptive Nanoscale Domain Networks
Optical Control of Adaptive Nanoscale Domain Networks Open
Adaptive networks can sense and adjust to dynamic environments to optimize their performance. Understanding their nanoscale responses to external stimuli is essential for applications in nanodevices and neuromorphic computing. However, it …
View article: Lateral Confinement in 2D Nanoplatelets: A Strategy to Expand the Colloidal Quantum Engineering Toolbox
Lateral Confinement in 2D Nanoplatelets: A Strategy to Expand the Colloidal Quantum Engineering Toolbox Open
Among colloidal nanocrystals, 2D nanoplatelets offer a unique set of properties with exceptionally narrow luminescence and low lasing thresholds. Furthermore, their anisotropic shape expands the playground for the complex design of heteros…
View article: Hidden correlations in stochastic photoinduced dynamics of a solid-state electrolyte
Hidden correlations in stochastic photoinduced dynamics of a solid-state electrolyte Open
Photoexcitation by ultrashort laser pulses plays a crucial role in controlling reaction pathways, creating nonequilibrium material properties, and offering a microscopic view of complex dynamics at the molecular level. The photo response f…
View article: Bright and durable scintillation from colloidal quantum shells
Bright and durable scintillation from colloidal quantum shells Open
View article: Long-Lived and Bright Biexcitons in Quantum Dots with Parabolic Band Potentials
Long-Lived and Bright Biexcitons in Quantum Dots with Parabolic Band Potentials Open
Multiple exciton physics in semiconductor nanocrystals play an important role in optoelectronic devices. This work investigates radially alloyed CdZnSe/CdS nanocrystals with suppressed Auger recombination due to the spatial separation of c…
View article: Coupling to octahedral tilts in halide perovskite nanocrystals induces phonon-mediated attractive interactions between excitons
Coupling to octahedral tilts in halide perovskite nanocrystals induces phonon-mediated attractive interactions between excitons Open
View article: Sub‐Nanosecond Reconfiguration of Ferroelectric Domains in Bismuth Ferrite
Sub‐Nanosecond Reconfiguration of Ferroelectric Domains in Bismuth Ferrite Open
Domain switching is crucial for achieving desired functions in ferroic materials that are used in various applications. Fast control of domains at sub‐nanosecond timescales remains a challenge despite its potential for high‐speed operation…
View article: Surface-Doped Zinc Gallate Colloidal Nanoparticles Exhibit pH-Dependent Radioluminescence with Enhancement in Acidic Media
Surface-Doped Zinc Gallate Colloidal Nanoparticles Exhibit pH-Dependent Radioluminescence with Enhancement in Acidic Media Open
As abnormal acidic pH symbolizes dysfunctions of cells, it is highly desirable to develop pH-sensitive luminescent materials for diagnosing disease and imaging-guided therapy using high-energy radiation. Herein, we explored near-infrared-e…
View article: Understanding and Controlling Photothermal Responses in MXenes
Understanding and Controlling Photothermal Responses in MXenes Open
MXenes have the potential for efficient light-to-heat conversion in photothermal applications. To effectively utilize MXenes in such applications, it is important to understand the underlying nonequilibrium processes, including electron-ph…
View article: Transient X-ray Diffraction Reveals Nonequilibrium Phase Transition in Thin Films of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite
Transient X-ray Diffraction Reveals Nonequilibrium Phase Transition in Thin Films of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite Open
Advantageous optoelectronic properties of methylammonium lead triiodide likely arise from coupling between photogenerated charge-carriers and the soft, deformable lattice. We investigate structural dynamics of MAPbI3 films using…
View article: Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric
Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric Open
Relaxor ferroelectrics have been intensely studied for decades based on their unique electromechanical responses which arise from local structural heterogeneity involving polar nanoregions or domains. Here, we report first studies of the u…
View article: Luminescence from Self‐Trapped Excitons and Energy Transfers in Vacancy‐Ordered Hexagonal Halide Perovskite Cs<sub>2</sub>HfF<sub>6</sub> Doped with Rare Earths for Radiation Detection (Advanced Optical Materials 19/2022)
Luminescence from Self‐Trapped Excitons and Energy Transfers in Vacancy‐Ordered Hexagonal Halide Perovskite Cs<sub>2</sub>HfF<sub>6</sub> Doped with Rare Earths for Radiation Detection (Advanced Optical Materials 19/2022) Open
Cs2HfX6 halides show a vacancy-ordered cubic double perovskite structure when X = Cl, Br, and I. As to the first member of the halide family, Zhiping Luo and co-workers (article number 2201374) identify Cs2HfF6 as a new type of vacancy-ord…
View article: Nonequilibrium Lattice Dynamics in Photoexcited 2D Perovskites
Nonequilibrium Lattice Dynamics in Photoexcited 2D Perovskites Open
Interplay between structural and photophysical properties of metal halide perovskites is critical to their utility in optoelectronics, but there is limited understanding of lattice response upon photoexcitation. Here, 2D perovskites butyla…
View article: Luminescence from Self‐Trapped Excitons and Energy Transfers in Vacancy‐Ordered Hexagonal Halide Perovskite Cs<sub>2</sub>HfF<sub>6</sub> Doped with Rare Earths for Radiation Detection
Luminescence from Self‐Trapped Excitons and Energy Transfers in Vacancy‐Ordered Hexagonal Halide Perovskite Cs<sub>2</sub>HfF<sub>6</sub> Doped with Rare Earths for Radiation Detection Open
Compared to halides Cs 2 HfX 6 (X = Cl, Br, I) with a vacancy‐ordered cubic double perovskite structure, the halide Cs 2 HfF 6 (CHF), with a hexagonal Bravais lattice, possesses a higher mass density and chemical stability for radiation de…
View article: Stressing Halide Perovskites with Light and Electric Fields
Stressing Halide Perovskites with Light and Electric Fields Open
Understanding the light and electric field-induced effects underlying the local changes in optoelectronic properties in lead halide perovskites is crucial to establish a detailed structure–function relationship. Here, in this study, we use…
View article: Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites
Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites Open
Understanding the origin of electron-phonon coupling in lead-halide perovskites (LHP) is key to interpreting and leveraging their optical and electronic properties. Here we perform femtosecond-resolved, optical-pump, electron-diffraction-p…
View article: Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites
Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites Open
Understanding the origin of electron-phonon coupling in lead-halide perovskites (LHP) is key to interpreting and leveraging their optical and electronic properties. Here we perform femtosecond-resolved, optical-pump, electron-diffraction-p…
View article: Dynamically Tunable Terahertz Emission Enabled by Anomalous Optical Phonon Responses in Lead Telluride
Dynamically Tunable Terahertz Emission Enabled by Anomalous Optical Phonon Responses in Lead Telluride Open
Lead telluride (PbTe), a narrow bandgap semiconductor commonly used in infrared detectors, exhibits anomalous vibrational and structural properties, making it appealing for thermoelectrics. Despite significant fundamental interest in the m…
View article: Dynamic structural views in solar energy materials by femtosecond electron diffraction
Dynamic structural views in solar energy materials by femtosecond electron diffraction Open
View article: Nanoscale Disorder Generates Subdiffusive Heat Transport in Self-Assembled Nanocrystal Films
Nanoscale Disorder Generates Subdiffusive Heat Transport in Self-Assembled Nanocrystal Films Open
Investigating the impact of nanoscale heterogeneity on heat transport requires a spatiotemporal probe of temperature on the length and time scales intrinsic to heat navigating nanoscale defects. Here, we use stroboscopic optical scattering…
View article: Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals
Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals Open
Nonradiative processes limit optoelectronic functionality of nanocrystals and curb their device performance. Nevertheless, the dynamic structural origins of nonradiative relaxations in such materials are not understood. Here, femtosecond e…
View article: Exciton diffusion exceeding 1 µm: run, exciton, run!
Exciton diffusion exceeding 1 µm: run, exciton, run! Open
View article: Dopant site-dependent luminescence from rare-earth doped dibarium octafluorohafnate Ba<sub>2</sub>HfF<sub>8</sub> nanocubes for radiation detection
Dopant site-dependent luminescence from rare-earth doped dibarium octafluorohafnate Ba<sub>2</sub>HfF<sub>8</sub> nanocubes for radiation detection Open
Rare-earth doped Ba2HfF8 nanocubes as a new scintillator host material with crystallographic site-dependent luminescence for radiation detection.
View article: Synthesis of Macroscopic Single Crystals of Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> via Single-Shot Femtosecond Optical Excitation
Synthesis of Macroscopic Single Crystals of Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> via Single-Shot Femtosecond Optical Excitation Open
Using in situ electron diffraction techniques, we demonstrate that femtosecond optical excitation above a threshold fluence of the amorphous, as-deposited, phase change material Ge2Sb2Te5 creates large, 100…