734 research outputs found
A new unique leafhopper genus of Erythroneurini from Thailand, with the description of one new species (Hemiptera, Cicadellidae, Typhlocybinae)
A new genus of the leafhopper tribe Erythroneurini (Cicadellidae, Typhlocybinae) from Thailand, Undulivena gen. n., and a new species Undulivena thaiensis sp. n., are described and illustrated. The new genus exhibits a unique feature of the forewing venation with CuA vein strongly sinuate
Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO
We use scanning tunneling spectroscopy to investigate the filled and empty
electronic states of superconducting single-unit-cell FeSe deposited on
SrTiO(001). We map the momentum-space band structure by combining
quasiparticle interference imaging with decay length spectroscopy. In addition
to quantifying the filled-state bands, we discover a -centered electron
pocket 75 meV above the Fermi energy. Our density functional theory
calculations show the orbital nature of empty states at and suggest
that the Se height is a key tuning parameter of their energies, with broad
implications for electronic properties.Comment: 5 pages, 5 figure
Genetic changes in fetal cerebral cortex after maternal exposure to sevoflurane
Purpose: To investigate the acute changes in transcriptome of radial glial progenitor cells after maternal exposure to sevoflurane.Methods: Two groups of sample data were collected from the data set in the GEO database. Pregnant mice in sevoflurane group were exposed to 2.5 % sevoflurane for 6 h on day 14.5 of the pregnancy, while the mice in control group were exposed to 100 % oxygen for 6 h. At the end of the exposure period, the cerebral cortex of the two groups of fetuses was isolated and analyzed by RNA sequencing. Differentially expressed genes (DEG) were analyzed using limma package of R language. The Gene Ontology (GO) and KEGG pathway enrichment were based on DEG through a cluster profile package of R. Moreover, protein-protein interactions (PPI) network construction and central gene prediction were carried out using a string database and R package.Results: Bioinformatics analysis revealed 289 up-regulated genes and 311 down-regulated DEGs, respectively. Gene Ontology and KEGG enrichment analysis revealed terms related to neural development and transcriptional function. Based on the central genes of the PPI network, it was found that certain genes may play significant roles in the regulation of neural development. These genes are hnRNPM, AURKA, NCBP, SRSF6, ASF1B, HNRNPA2B1, DDX21, H3F3B, KPNA2 and ABCE1 (p < 0.05).Conclusion: The findings of this study suggest that hub genes and a variety of signal pathways may play key roles in the development of radial glial progenitor cells
Strong Majorana evidence of a vortex from scanning tunneling microscopy with a dissipative environment
It is predicted that a vortex in a topological superconductor contains a
Majorana zero mode (MZM). The confirmative Majorana signature, i.e., the
quantized conductance, however is easily sabotaged by unavoidable
interruptions, e.g. instrument broadening, non-Majorana signal, and extra
particle channels. We propose to avoid the signal interruption by introducing
disorder-induced dissipation that couples to the tip-sample tunneling. With
dissipation involved, we highlight three features, each of which alone can
provide a strong evidence to identify MZM. Firstly, dissipation suppresses a
finite-energy Caroli-de Gennes-Matricon (CdGM) conductance peak into a valley,
while it does not split MZM zero-bias conductance peak. Secondly, we predict a
dissipation-dependent scaling feature of the zero-bias conductance peak.
Thirdly, the introduced dissipation manifests the MZM signal by suppressing
non-topological CdGM modes. Importantly, the observation of these features does
not require a quantized conductance value .Comment: 13 pages, 5 figures with reference list update
Anisotropic vortex lattice structures in the FeSe superconductor
In the recent work by Song et al. [Science 332, 1410 (2011)], the scanning
tunneling spectroscopy experiment in the stoichiometric FeSe reveals evidence
for nodal superconductivity and strong anisotropy. The nodal structure can be
explained with the extended s-wave pairing structure with the mixture of the
and pairing symmetries. We calculate the anisotropic
vortex structure by using the self-consistent Bogoliubov-de Gennes mean-field
theory. In considering the absence of magnetic ordering in the FeSe at the
ambient pressure, orbital ordering is introduced, which breaks the
lattice symmetry down to , to explain the anisotropy in the vortex
tunneling spectra.Comment: 9 page
Visualizing the elongated vortices in -Ga nanostrips
We study the magnetic response of superconducting -Ga via low
temperature scanning tunneling microscopy and spectroscopy. The magnetic vortex
cores rely substantially on the Ga geometry, and exhibit an unexpectedly-large
axial elongation with aspect ratio up to 40 in rectangular Ga nano-strips
(width 100 nm). This is in stark contrast with the isotropic circular
vortex core in a larger round-shaped Ga island. We suggest that the unusual
elongated vortices in Ga nanostrips originate from geometric confinement effect
probably via the strong repulsive interaction between the vortices and Meissner
screening currents at the sample edge. Our finding provides novel conceptual
insights into the geometrical confinement effect on magnetic vortices and forms
the basis for the technological applications of superconductors.Comment: published in Phys. Rev. B as a Rapid Communicatio
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