80,423 research outputs found
Quantum Spin Hall and Quantum Anomalous Hall States Realized in Junction Quantum Wells
Both quantum spin Hall and quantum anomalous Hall states are novel states of
quantum matter with promising applications. We propose junction quantum wells
comprising II-VI, III-V or IV semiconductors as a large class of new materials
realizing the quantum spin Hall state. Especially, we find that the bulk band
gap for the quantum spin Hall state can be as large as 0.1 eV. Further more,
magnetic doping would induce the ferromagnetism in these junction quantum wells
due to band edge singularities in the band-inversion regime and to realize the
quantum anomalous Hall state.Comment: 5 pages, 4 figure
Evolution of Surface Deformations of Weakly-Bound Nuclei in the Continuum
We study weakly-bound deformed nuclei based on the coordinate-space Skyrme
Hartree-Fock-Bogoliubov approach, in which a large box is employed for treating
the continuum and surface diffuseness. Approaching the limit of core-halo
deformation decoupling, calculations found an exotic "egg"-like structure
consisting of a spherical core plus a prolate halo in Ne, in which the
resonant continuum plays an essential role. Generally the halo probability and
the decoupling effect in heavy nuclei are reduced compared to light nuclei, due
to denser level densities around Fermi surfaces. However, deformed halos in
medium-mass nuclei are possible with sparse levels of negative parity, for
example, in Ge. The surface deformations of pairing density
distributions are also influenced by the decoupling effect and are sensitive to
the effective pairing Hamiltonian.Comment: 5 pages and 5 figure
Fully gapped superconducting state in Au2Pb: a natural candidate for topological superconductor
We measured the ultra-low-temperature specific heat and thermal conductivity
of AuPb single crystal, a possible three-dimensional Dirac semimetal with a
superconducting transition temperature 1.05 K. The electronic
specific heat can be fitted by a two-band s-wave model, which gives the gap
amplitudes (0)/ = 1.38 and (0)/ = 5.25.
From the thermal conductivity measurements, a negligible residual linear term
in zero field and a slow field dependence of at low
field are obtained. These results suggest that AuPb has a fully gapped
superconducting state in the bulk, which is a necessary condition for
topological superconductor if AuPb is indeed one.Comment: 6 pages, 4 figure
Fabrication and characterization of smart fabric using energy storage fibres
Fibre supercapacitors were designed and manufactured using a dip-coating method. Their electrochemical properties were characterized using a VersaSTAT 3 workstation. Chinese ink with a fine dispersion of carbon and binder was coated as the electrode material. The specific capacitance per unit length of a copper fibre supercapacitor with the length of 41 cm reached 34.5 mF/cm. When this fibre supercapacitor was bent on rods with a diameter of 10.5 cm, the specific capacitance per length was 93% of the original value (without bending). It showed that these fibre supercapacitors have good flexibility and energy storage capacity. Furthermore, the fibre supercapacitor in the fabric showed the same capacitance before and after weaving.The European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement no. [281063]
Information Enhancement for Travelogues via a Hybrid Clustering Model
© 2018 IEEE. Travelogues consist of textual information shared by tourists through web forums or other social media which often lack illustrations (images). In image sharing websites like Flicker, users can post images with rich textual information: 'title', 'tag' and 'description'. The topics of travelogues usually revolve around beautiful sceneries. Corresponding landscape images recommended to these travelogues can enhance the vividness of reading. However, it is difficult to fuse such information because the text attached to each image has diverse meanings/views. In this paper, we propose an unsupervised Hybrid Multiple Kernel K-means (HMKKM) model to link images and travelogues through multiple views. Multi-view matrices are built to reveal the correlations between several respects. For further improving the performance, we add a regularisation based on textual similarity. To evaluate the effectiveness of the proposed method, a dataset is constructed from TripAdvisor and Flicker to find the related images for each travelogue. Experiment results demonstrate the superiority of the proposed model by comparison with other baselines
Odd-even mass staggering with Skyrme-Hartree-Fock-Bogoliubov theory
We have studied odd-even nuclear mass staggering with the
Skyrme-Hartree-Fock-Bogoliubov theory by employing isoscalar and isovector
contact pairing interactions. By reproducing the empirical odd-even mass
differences of the Sn isotopic chain, the strengths of pairing interactions are
determined. The optimal strengths adjusted in this work can give better
description of odd-even mass differences than that fitted by reproducing the
experimental neutron pairing gap of Sn.Comment: 9 pages, 3 figures, submitted to PRC Brief Repor
Search for Compact Extragalactic Radio Sources Near Massive Star Forming Regions
We have used the Very Large Array to search for compact milliarcsecond-size
radio sources near methanol masers in high-mass star-forming regions. Such
sources are required for Very Long Baseline Interferometry phase-referencing
observations. We conducted pointed observations of 234 compact sources found in
the NVSS survey and find 92 sources with unresolved components and synchrotron
spectral indexes. These sources are likely the cores of AGNs and, thus, good
candidates for astrometric calibrators.Comment: 23 pages, lots of figures, accepted in ApJ
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