Results 71 to 80 of about 882 (192)
Optical Access to Dark Excitons Via Spin–Phonon Fano Interference
Advanced Science, EarlyView.Dark excitons in quantum dots neither absorb nor emit light and stay hidden from optical spectroscopy. Quantum interference now reveals them: light scattered by acoustic phonons interferes with a phonon‐assisted spin flip between bright and dark exciton, carving a Fano dip into the spectrum whose position gives the bright–dark splitting. Magnetic field,
Janina J. Schindler +7 more
wiley +1 more source
Applied Physics ExpressThe development of tunable photonic devices is strategic for miniaturized optical instrumentation and sensing systems. Exploiting the birefringence variation of liquid crystals (LCs) instead of MEMS actuation in such devices could bring better spectral ...
Hugo Villanti +6 more
doaj +1 more source
Extrinsic and Intrinsic Charge Transfer at Interfaces of Membrane‐Based Oxide Heterostructures
Advanced Electronic Materials, EarlyView.Freestanding oxides have emerged as a new opportunity to tailor oxides outside of the typical epitaxial constraints. We present the fabrication of TiO2‐terminated SrTiO3 membranes via direct growth control. We demonstrate competing ionic and electronic charge transfer in LaAlO3/SrTiO3 bilayers using near ambient pressure XPS.
Kapil Nayak +8 more
wiley +1 more source
Atomic‐Scale Mechanisms of Anisotropic Thermal Decomposition in GeSn Alloys With Stepwise Pinning
Advanced Electronic Materials, EarlyView.Combining in situ TEM with DFT calculations, this work elucidates atomic‐scale anisotropic thermal decomposition in GeSn films, identifying laminar receding in defect‐free regions and stepwise pinning at stacking faults. Driven by crystallographic anisotropy and defect‐mediated energetic penalties, these findings establish a physical framework for ...
YiXin Wang +6 more
wiley +1 more source
Automated Spin‐Assisted Layer‐by‐Layer Epitaxy Produces Highly Oriented Mixed‐Linker MOF Thin Films
Angewandte Chemie International Edition, EarlyView.An automated spin‐assisted layer‐by‐layer growth method enables rapid fabrication of highly oriented Zn2BDC2DABCO metal‐organic framework thin films under ambient conditions. Correlative characterization confirms excellent reproducibility, uniform film formation, and exceptional out‐of‐plane orientation exceeding 85%.
Eleonora Afanasenko +13 more
wiley +1 more source
Ordered GaAs quantum dots by droplet epitaxy
, 2020 We report the fabrication of highly ordered arrays of GaAs/AlGaAs quantum dots (QDs) by droplet epitaxy using in-situ direct laser interference patterning (DLIP). Two-dimensional arrays of Ga droplets with a periodicity of ~ 300 nm are initially formed on nanoisland structured AlGaAs surfaces due to the localised surface diffusion under the influence ...
Wang, Yunran +2 more
openaire +2 more sources
The Interplay of Crystal‐Field Transitions and Exchange Spin Dynamics in a Ferrimagnet
Advanced Physics Research, EarlyView.Temperature‐dependent THz spectroscopy reveals strong hybridization between Yb3+ CEF excitations and Yb–Fe exchange dynamics in Gd3/2Yb1/2BiFe5O12. Near the magnetization compensation temperature, spectral weight is redistributed between the coupled modes, while the Yb–Fe exchange mode exhibits an anomalous redshift upon cooling due to CEF‐mediated ...
Arpita Dutta +3 more
wiley +1 more source
Self-Assembled Local Artificial Substrates of GaAs on Si Substrate
Nanoscale Research Letters, 2010 We propose a self-assembling procedure for the fabrication of GaAs islands by Droplet Epitaxy on silicon substrate. Controlling substrate temperature and amount of supplied gallium is possible to tune the base size of the islands from 70 up to 250 nm and
Frigeri C +4 more
doaj +1 more source
Carbon Energy, EarlyView.High‐entropy perovskite oxides enable tunable structures and properties through multi‐cation disorder and entropy stabilization. This review summarizes advances in synthesis, structural and defect engineering, and their applications in OER/ORR, CO2RR, and electrochemical energy storage, highlighting in situ characterization and modeling that clarify ...
Obeylaw Moyo +8 more
wiley +1 more source
Surface Localization of Buried III–V Semiconductor Nanostructures
Nanoscale Research Letters, 2009 In this work, we study the top surface localization of InAs quantum dots once capped by a GaAs layer grown by molecular beam epitaxy. At the used growth conditions, the underneath nanostructures are revealed at the top surface as mounding features that ...
Alonso-González P +4 more
doaj +1 more source