307 research outputs found
Transport Properties in Ferromagnetic Josephson Junction between Triplet Superconductors
Charge and spin Josephson currents in a ballistic
superconductor-ferromagnet-superconductor junction with spin-triplet pairing
symmetry are studied using the quasiclassical Eilenberger equation. The gap
vector of superconductors has an arbitrary relative angle with respect to
magnetization of the ferromagnetic layer. We clarify the effects of the
thickness of ferromagnetic layer and magnitude of the magnetization on the
Josephson charge and spin currents. We find that 0-\pi transition can occur
except for the case that the exchange field and d-vector are in nearly
perpendicular configuration. We also show how spin current flows due to
misorientation between the exchange field and d-vector.Comment: 6 pages, 8 figure
Signatures of d-Wave Symmetry on Thermal Dirac Fermions in Graphene-Based F/I/d Junctions
We study theoretically the behavior of thermal massless Dirac fermions inside
graphene-based Ferromagnetic/Insulator/d-wave (s-wave) superconductor (F/I/d
and F/I/S) junctions in the ballistic regime. Using the Dirac-BdG wave
functions within the three regions and appropriate boundary conditions, the
Andreev and Normal reflection coefficients are derived. By employing the
obtained Andreev and Normal reflection coefficients the characteristics of heat
current through the F/I/d and F/I/S junctions are investigated within the thin
barrier approximation. We find that for s-wave superconductors, thermal
conductance oscillates sinusoidally vs barrier strength. The finding persist
for the values of , the orientation of d-wave superconductor crystal in
the -space, below . By increasing temperature, the thermal
conductance is increased exponentially for small values of and for
larger values the quantity is modified to exhibit a linear behavior at
which is similar to Wiedemann-Franz law for metals in low
temperatures.Comment: 6 pages, 6 figure
Compassion development in higher education
Many schools of psychology and religious studies intend to promote the cultivation of compassion. Compassion is currently an integral area of study in psychology, religious studies, and higher education, specifically in faith-based higher education. While secular universities in the United States strive to generate disciplinary-based knowledge through scholarship, their ability to promote students\u27 use of the information they are learning to create positive social change has typically lagged. Conscious of the magnitude of today\u27s global issues and dissatisfied with the current disparity between the world\u27s reality and university curricula, scholars have begun to re-imagine the role of higher education in forming the leaders who will face our most exigent problems. The present article reviews how compassion can be integrated into university curriculum, specifically in faith-based institutions. The article also discusses how compassion can be measured throughout the course of undergraduates\u27 careers
Stationary Josephson effect in a weak-link between nonunitary triplet superconductors
A stationary Josephson effect in a weak-link between misorientated nonunitary triplet superconductors
is investigated theoretically. The non-self-consistent quasiclassical Eilenberger equation
for this system has been solved analytically. As an application of this analytical calculation,
the current-phase diagrams are plotted for the junction between two nonunitary bipolar f-wave
superconducting banks. A spontaneous current parallel to the interface between superconductors
has been observed. Also, the effect of misorientation between crystals on the Josephson and spontaneous
currents is studied. Such experimental investigations of the current-phase diagrams can be
used to test the pairing symmetry in the above-mentioned superconductors
Spin polarized transport in the weak-link between -wave superconductors
The spin current in the Josephson junction as a weak link (interface) between
misorientated triplet superconductors is investigated theoretically for the
models of the order parameter in . Green functions of the system are
obtained from the quasiclassical Eilenberger equations. The analytical results
for the charge and spin currents are illustrated by numerical calculations for
the certain misorientation angles of gap vector of superconductors. As the main
result of this paper, it is found that, at some values of the phase difference,
at which the charge current is exactly zero, the spin current has its maximum
value. Furthermore, it is shown that the origin of spin current is the
misorientation between gap vectors of triplet superconductors.Comment: 7pages, 9 figure
Charge and spin currents in the ballistic SNS Josephson junction between p-wave superconductors
Charge and spin transport properties of a clean TS–N–TS Josephson junction (triplet superconductor-normal metal-triplet superconductor) are studied using the quasiclassical Eilenberger equation for Green's function. Effects of thickness of normal layer between superconductors on the spin and charge currents are investigated. The effect of a misorientation between triplet superconductors which creates the spin current is the main subject of this paper. It is shown that for some values of phase difference between superconductors the spin current exists in the absence of charge current and vice versa
Stationary Josephson effect in a weak-link between nonunitary triplet superconductors
A stationary Josephson effect in a weak-link between misorientated nonunitary
triplet superconductors is investigated theoretically. The non-self-consistent
quasiclassical Eilenberger equation for this system has been solved
analytically. As an application of this analytical calculation, the
current-phase diagrams are plotted for the junction between two nonunitary
bipolar wave superconducting banks. A spontaneous current parallel to the
interface between superconductors has been observed. Also, the effect of
misorientation between crystals on the Josephson and spontaneous currents is
studied. Such experimental investigations of the current-phase diagrams can be
used to test the pairing symmetry in the above-mentioned superconductors.Comment: 6 pages and 6 figure
Effect of point-contact transparency on coherent mixing of Josephson and transport supercurrents
The influence of electron reflection on dc Josephson effect in a ballistic
point contact with transport current in the banks is considered theoretically.
The effect of finite transparency on the vortex-like currents near the contact
and at the phase difference which has been predicted recently
\cite{KOSh}, is investigated. We show that at low temperatures even a small
reflection on the contact destroys the mentioned vortex-like current states,
which can be restored by increasing of the temperature.Comment: 6 pages, 8 Figures, Latex Fil
High prevalence of an alpha variant lineage with a premature stop codon in ORF7a in Iraq, winter 2020–2021
Publisher Copyright: Copyright: © 2022 Al-Rashedi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Since the first reported case of coronavirus disease 2019 (COVID-19) in China, SARS-CoV-2 has been spreading worldwide. Genomic surveillance of SARS-CoV-2 has had a critical role in tracking the emergence, introduction, and spread of new variants, which may affect transmissibility, pathogenicity, and escape from infection or vaccine-induced immunity. As anticipated, the rapid increase in COVID-19 infections in Iraq in February 2021 is due to the introduction of variants of concern during the second wave of the COVID-19 pandemic. To understand the molecular epidemiology of SARS-CoV-2 during the second wave in Iraq (2021), we sequenced 76 complete SARS-CoV-2 genomes using NGS technology and identified genomic mutations and proportions of circulating variants among these. Also, we performed an in silico study to predict the effect of the truncation of NS7a protein (ORF7a) on its function. We detected nine different lineages of SARS-CoV-2. The B.1.1.7 lineage was predominant (80.20%) from February to May 2021, while only one B.1.351 strain was detected. Interestingly, the phylogenetic analysis showed that multiple strains of the B.1.1.7 lineage clustered closely with those from European countries. A notable frequency (43.33%) of stop codon mutation (NS7a Q62stop) was detected among the B.1.1.7 lineage sequences. In silico analysis of NS7a with Q62stop found that this stop codon had no considerable effect on the function of NS7a. This work provides molecular epidemiological insights into the spread variants of SARS-CoV-2 in Iraq, which are most likely imported from Europe.Peer reviewe
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