Browsing Physics by Title
Now showing items 2026-2045 of 2104
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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 ... -
Ultrafast non-linear optics for telecommunication applications
(Trinity College (Dublin, Ireland). School of Physics, 2003)The aim of the research done for this thesis was to characterise the properties of a fibre laser producing ultrashort pulses at the telecommunication wavelength of 1550nm. We also measured the nonlinear optical properties ... -
Ultrafast Optical Nonlinearity of Liquid Phase Exfoliated Pdse2 Nanosheets.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)In recent years, the study of condensed matter and optical physics has resulted in increasing technological progress, and this study may be credited with a significant portion of current scientific research and technical ... -
Ultrafast spectroscopy of DNA binding systems
(Trinity College (Dublin, Ireland). School of Physics, 2004)Ultrafast transient spectroscopy was used to investigate the properties of various systems which bind to DNA. Visible and IR pump and probe was employed to elucidate excited state process of the DNA binding complexes. Ultra ... -
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 DNA dispersed single-walled carbon nanotube systems
(Trinity College (Dublin, Ireland). School of Physics, 2008)HiPCO Single-walled carbon nanotubes (SWNTs) have been dispersed in water using a variety of different nucleic acids. An extensive study of the factors controlling the quality of the DNA-SWNT dispersions was carried out, ... -
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 ...
