Browsing Physics (Scholarly Publications) by Title
Now showing items 1611-1630 of 1675
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Ultra-soft magnetic Co-Fe-B-Si-Nb amorphous alloys for high frequency power applications
(2018)With the continuous shrinkage of the footprint of inductors and transformers in modern power supplies, higher flux, while still low-loss metallic replacements of traditional ferrite materials are becoming an intriguing ... -
Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet
(2021)All-optical reswitching has been investigated in the half-metallic Heusler ferrimagnet Mn2Ru0.9Ga, where Mn atoms occupy two inequivalent sites in the XA-type structure. The effect of a second 200 fs, 800 nm laser pulse ... -
Ultrahigh conductivity in Weyl semimetal NbAs nanobelts
(2019)In two-dimensional (2D) systems, high mobility is typically achieved in low-carrier-density semiconductors and semimetals. Here, we discover that the nanobelts of Weyl semimetal NbAs maintain a high mobility even in the ... -
Ultralow-frequency photocurrent oscillation in ZnO nanowires
(2010)We report experimental results of ultralow frequency photocurrent oscillation in individual ZnO nanowires. Consecutive photocurrent and photoluminescence measurements corroborate the process of capture and release of ... -
Ultraviolet irradiation controlled memory effect in graphene field effect transistors
(Small, 2013)Sensitivity of graphene to its surroundings including adsorbates, trapped charges on the substrate, and photons may open an avenue for photon-controlled graphene memory devices via control of the charge transfer process. ... -
Understanding the Physical Nature of Coronal "EIT Waves"
(2017)For almost 20 years the physical nature of globally propagating waves in the solar corona (commonly called “EIT waves”) has been controversial and subject to debate. Additional theories have been proposed over the years ... -
A unified picture of the covalent bond within quantum-accurate force fields: From organic molecules to metallic complexes? reactivity
(American Association for the Advancement of Science (AAAS), 2019)Computational studies of chemical processes taking place over extended size and time scales are inaccessible by electronic structure theories and can be tackled only by atomistic models such as force fields. These have ... -
Unlocking the Origin of Compositional Fluctuations in InGaN Light Emitting Diodes
(2021)The accurate determination of compositional fluctuations is pivotal in understanding their role in the reduction of efficiency in high indium content InxGa1–xN light emitting diodes (LEDs), the origin of which is still ... -
Unveiling Charge-Transport Mechanisms in Electronic Devices Based on Defect-Engineered MoS2 Covalent Networks
(2023)Device performance of solution-processed 2D semiconductors in printed electronics has been limited so far by structural defects and high interflake junction resistance. Covalently interconnected networks of transition metal ... -
Unveiling phonons in a molecular qubit with four-dimensional inelastic neutron scattering and density functional theory
(2020)Phonons are the main source of relaxation in molecular nanomagnets, and different mechanisms have been proposed in order to explain the wealth of experimental findings. However, very limited experimental investigations on ... -
Unveiling the dynamic capacitive storage mechanism of Co3O4 @NiCo2O4 hybrid nanoelectrodes for supercapacitor applications
(2014)We report a simple and cost-effective approach to the synthesis of hierarchical mesporous Co3O4@NiCo2O4 nanoforests on Ni foam for supercapacitor (SC) electrode applications by a coupled one-step solution and annealing ... -
Up-Conversion Luminescence in Colloidal CdTe Nanocrystals
(Materials Research Society, 2002) -
Upper bound for the conductivity of nanotube networks
(2009)Films composed of nanotube networks have their conductivities regulated by the junction resistances formed between tubes. Conductivity values are enhanced by lower junction resistances but should reach a maximum that is ... -
The use of wide-bandgap CuCl on silicon for ultra-violet photonics
(2005)γ-CuCl is a wide-bandgap (Eg = 3.395eV), direct bandgap, semiconductor material with a cubic zincblende lattice structure. Its lattice constant, aCuCl = 0.541 nm, means that the lattice mismatch to Si (aSi = 0.543 nm) is ... -
Using chronoamperometry to rapidly measure and quantitatively analyse rate-performance in battery electrodes
(2020)For battery electrodes, measured capacity decays as charge/discharge current is increased. Such rate-performance is usually characterised via galvanostatic charge-discharge measurements, experiments which are very slow, ... -
Using steps at the Si-SiO2 interface to test simple bond models of the optical second-harmonic response
(2007)A simple bond model of the optical second-harmonic (SH) response from interfaces, which assumes a single axial component for each bond, is tested by comparing the response from different step structures at the Si?SiO2 ... -
Using surface and interface optics to probe the capping, with amorphous Si, of Au atom chains grown on vicinal Si(111)
(2009)The distinct optical signatures of aligned single and double Au atom chain structures, grown on vicinal Si(111) substrates, have been identified using reflectance anisotropy spectroscopy (RAS). Deposition of 0.04 monolayers ...
