Magnetic Weyl semimetals are promising materials for spintronic applications due to their unique properties in bulk and surface topological states and the rich interplay between band topology and magnetism. While vari...
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Magnetic Weyl semimetals are promising materials for spintronic applications due to their unique properties in bulk and surface topological states and the rich interplay between band topology and magnetism. While various nontraditional magneto-electrical effects have been studied in magnetic Weyl semimetals, transport properties related to spin-polarized tunneling from these materials remain less explored. In this work, we developed fully epitaxial magnetic tunnel junctions (MTJs) based on a ferromagnetic Weyl semimetal Co2MnGa. By growing Co2MnGa films under different conditions, we fabricated a series of MTJs possessing different degrees of order in the semimetal electrodes and compared their tunneling magnetoresistance (TMR). We find that the TMR becomes enhanced with the improvement of the chemical ordering of Co2MnGa. Our results reveal the relationship between the spin tunneling in MTJs and the chemical order of the Co2MnGa electrode and provide insights on further enhancing TMR via semimetal engineering.
Trap-mediated recombination influences the performance of a wide range of electronic devices. The well-known Shockley-Read-Hall (SRH) expression for inorganic semiconductors is often invoked to describe the recombinat...
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Trap-mediated recombination influences the performance of a wide range of electronic devices. The well-known Shockley-Read-Hall (SRH) expression for inorganic semiconductors is often invoked to describe the recombination rate in organic materials, although without a clear understanding of how its parameters relate to the underlying material properties or how it should be modified to account for the finite lifetime of exciton intermediates in, for example, the doped emissive layer of an organic light-emitting diode (OLED). Here, we formalize SRH recombination for organic semiconductors based on diffusive trapping and Langevin recombination. We show that including the exciton state suppresses the recombination rate in host-guest systems with type II energy level alignment whenever the interfacial gap between the host and guest molecular orbitals is comparable to the exciton energy. These results quantify the balance between bimolecular and trap-mediated recombination in doped OLED emissive layers, and indicate that devices with type II host-guest pairings can, in principle, beat the thermodynamic limit of their neat guest counterparts.
The increasing integration of distributed energy resources in distribution networks has significantly reduced system inertia, posing challenges to grid stability during transient events, such as Cold Load Pickup (CLPU...
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Monitoring partial discharges (PDs) in high voltage (HV) electrical equipment is an effective tool to prevent unscheduled shutdown and eliminate possible failures. The inception of PDs can take various forms within th...
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This article explores the topic involving children with autism, referencing what this condition is about, as well as the hypotheses for approaching the problem based on the literature reviewed. The proposed approach i...
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The growing privacy concerns and the communication costs associated with transmitting raw data have resulted in techniques like federated learning, where the machine learning models are trained at the edge nodes, and ...
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We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in laser-cooled Rb87 atoms. When biphotons are nondegenerate, nonsymmetric ph...
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We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in laser-cooled Rb87 atoms. When biphotons are nondegenerate, nonsymmetric photonic absorption loss results in exponential decay of the temporal waveform of the two-photon joint probability amplitude, leading to shortened coherence time. In contrast, in the case of degenerate biphotons, when both paired photons propagate with the same group velocity and absorption coefficient, the two-photon coherence time, protected by space-time symmetry, remains unaffected by medium absorptive losses. Our experimental results validate these theoretical predictions. This outcome highlights the pivotal role of symmetry in manipulating and controlling photonic quantum states.
The modulation bandwidth of the Light Emitting Diode (LED) is an essential parameter for visible light communication systems. The crystal orientation of an LED plays an important role in determining the modulation ban...
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The assessment of hybrid energy systems for generating electricity and green hydrogen for cooking and heating is crucial for advancing green technology integration. The annual increases in electricity tariffs have pro...
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ISBN:
(纸本)9798331535162
The assessment of hybrid energy systems for generating electricity and green hydrogen for cooking and heating is crucial for advancing green technology integration. The annual increases in electricity tariffs have prompted individuals to revert to traditional methods of cooking and heating. Research conducted by climatologists indicates that these conventional practices are environmentally harmful and contribute to adverse climate change. This study is aimed at rural communities of Limpopo province to find new ways to bring affordable, reliable electricity and green hydrogen energy for cooking and heating purposes. The study focuses on implementing population size-dependent hybrid energy systems to produce green hydrogen. Four communities in Limpopo province, Ga-Masekwa, Ka-Dzingidzingi, Duthuni, and Mookgopong non-urban, have been randomly selected for this assessment. The Herman-Beta method, in conjunction with Homer Pro software, is employed to estimate maximum loads in selected communities. This approach facilitates the simulation of various hybrid energy system configurations, allowing for a comprehensive analysis of energy generation and consumption dynamics. Configurations comprised of PV/H2/Grid and PV/BES/H2/Grid are evaluated to determine the best hybrid energy system for each community based on economic performance. Results obtained indicate that the PV/H2/Grid configuration is the most cost-effective, with the lowest NPC and LCOE, offering a high return on investment for potential investors. The NPC of this configuration in all communities is R3.01M, R88.3M, R162M, and R299M, respectively. The corresponding LCOEs are 1.02 R/kWh, 1.2 R/kWh, 1.18 R/kWh, and 1.12 R/kWh. However, it is noted that green hydrogen production requires a significant amount of energy, making the hybrid system run more expensive than it would be otherwise. Successful green hydrogen use in rural communities can lead to economic growth, sustainable cities, reduced emissions, and a tr
As machine learning algorithms increasingly influence crucial decisions in areas like loan approvals and hiring, understanding human strategic behavior in response to these systems becomes vital. We explore strategic ...
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