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Modeling Formation and Stability of Fluorescent Defects in Wide-Bandgap Semiconductors
No full textPoint defects in wide-bandgap semiconductors can be used to implement qubits that exploit spin-dependent fluorescence from electronic transitions. These qubits are the quantum mechanical analog of classical bits in that they leverage quantum mechanical properties such as superposition and entanglement and a spin-dependent fluorescence implies the ability to read out the qubit state optically. Fluorescent defects in wide-bandgap semiconductors such as diamond have long been studied, but an electronic spin coherence time exceeding one second at room temperature for the NV−, a defect in diamond comprised of a substitutional nitrogen atom adjacent to a carbon vacancy with a single negative charge, has only relatively recently been demonstrated. The demonstration of long-lived spin memory coupled with the fact that the NV− exhibits spin-dependent fluorescence spurred research on other point defects in diamond and in related materials such as silicon carbide for applications in quantum computing and quantum information as well as in magnetometry. However, maximizing the yield of point defects from the various techniques for creating them such as ion implantation or chemical vapor deposition is still not perfectly understood. Using density functional theory and kinetic Monte Carlo and molecular dynamics simulations, we provide an understanding of the thermodynamics and kinetics of point defect formation and migration that can be used to predict the annealing regimes that should lead to high yields and we provide a general framework that can be used to explain relative yields for various Fermi level regimes.Physic
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Charge-state stability of color centers in wide band gap semiconductors
No full textThe NV− color center in diamond has been extensively investigated for applications in quantum sensing, computation, and communication. Nonetheless, charge-state decay from the NV − to its neutral counterpart the NV 0 detrimentally affects the robustness of the NV − center and remains to be fully overcome. In this work, we provide an ab initio formalism for accurately estimating the rate of charge-state decay of color centers in wide band gap semiconductors. Our formalism employs density functional theory calculations in the context of thermal equilibrium. We illustrate the method using the transition of NV − to NV 0 in the presence of substitutional N [see Z. Yuan et al., Phys. Rev. Res. 2, 033263 (2020)]
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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