Results 121 to 130 of about 31,660 (298)
Advanced Materials Technologies, EarlyView.One‐dimensional C4N2H14PbBr4 is shown to have a quasi‐direct electronic band structure and strongly anisotropic transport with polarized broadband emission. A GW/Bethe–Salpeter excited‐state force formalism, supported by polarized Raman and temperature‐dependent photoluminescence, identifies low–frequency Pb–Br phonons that drive ultrafast exciton self‐
Rijan Karkee +7 more
wiley +1 more source
Ultrafast changes in lattice symmetry probed by coherent phonons
, 2012 The electronic and structural properties of a material are strongly determined by its symmetry. Changing the symmetry via a photoinduced phase transition offers new ways to manipulate material properties on ultrafast timescales.
A Cavalleri +34 more
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Room Temperature Anisotropic Photoresponse in Low‐Symmetry Van der Waals Semiconductor CrPS4
Advanced Optical Materials, EarlyView.ABSTRACT The crystalline and optical anisotropy of low‐symmetry 2D materials can enable strong dichroic responses, enhancing polarization contrast for photonic and optoelectronic devices. Here, we unveil pronounced optical and optoelectronic anisotropy in chromium thiophosphate (CrPS4) arising from the strong coupling between light polarization and its
Cédric A. Cordero‐Silis +4 more
wiley +1 more source
Disorder‐Induced Extremely Low Thermal Conductivity of Graphite Fluoride
Advanced Science, EarlyView.This article investigates the effect of fluorination on the thermal conductivity of graphite fluoride, demonstrating the relationship between structural modification and thermal conductivity in an extreme case. The record‐low through‐plane thermal conductivity measured in exfoliated graphite fluoride flakes was found to correlate with the wide ...
Wonsik Lee +10 more
wiley +1 more source
Room-temperature macromolecular serial crystallography using synchrotron radiation
IUCrJ, 2014 A new approach for collecting data from many hundreds of thousands of microcrystals using X-ray pulses from a free-electron laser has recently been developed.
Francesco Stellato +19 more
doaj +1 more source
Picosecond strain dynamics in Ge$_{2}$Sb$_{2}$Te$_{5}$ monitored by time-resolved x-ray diffraction
, 2014 Coherent phonons (CP) generated by laser pulses on the femtosecond scale have been proposed as a means to achieve ultrafast, non-thermal switching in phase-change materials such as Ge$_{2}$Sb$_{2}$Te$_{5}$(GST).
Calarco, Raffaella +11 more
core +1 more source
Advanced Science, EarlyView.Terahertz resonances in crystalline heterostructures could close a spectral gap between conventional electronics and photonics while opening new windows on non‐equilibrium lattice dynamics. Femtosecond optical screening of the depolarization field in epitaxial PbTiO3/SrTiO3 superlattices launches a collective polar mode that oscillates near 1 THz and ...
Deepankar Sri Gyan +13 more
wiley +1 more source
Femtosecond laser induced structural dynamics and melting of Cu (111) single crystal. An ultrafast time-resolved x-ray diffraction study [PDF]
, 2017 Runze Li +4 more
openalex +1 more source
Advanced Science, EarlyView.A high‐quality solution‐processed Sb2(S,Se)3/CdS heterojunction is designed to overcome the intrinsic limitations of conventional photodetectors. The fabricated device achieves an excellent self‐powered performance, including a high responsivity of 0.6 A W−1, an ultrahigh specific detectivity of 7.68 × 1012 Jones, and a wide 3db bandwidth of 175 kHz ...
Xuhua Xiao +6 more
wiley +1 more source