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4.0

Jun 27, 2018
06/18

by
Li-Da Zhang; Fan Yang; Yugui Yao

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We study the electronic instabilities of doped bilayer silicene using the random phase approximation. In contrast to the singlet $d+id'$ superconductivity at the low doping region, we find that the system is an itinerant ferromagnet in the narrow doping regions around the Van Hove singularities, and a triplet $p+ip'$ superconductor in the vicinity of these regions. Adding a weak Kane-Mele spin-orbit coupling to the system further singles out the time-reversal invariant equal-spin helical...

Topics: Superconductivity, Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1505.01971

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43

Sep 18, 2013
09/13

by
Li-Da Zhang; Yi-Shi Duan; Yu-Xiao Liu

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Using the $\phi$-mapping method, we argue that ferromagnetic spin-triplet superconductors allow formation of unstable magnetic monopoles. In particular, we show that the limit points and the bifurcation points of the $\phi$-mapping will serve as the interaction points of these magnetic monopoles.

Source: http://arxiv.org/abs/0809.0120v1

3
3.0

Jun 29, 2018
06/18

by
Xin Wang; Geoffrey Oxholm; Da Zhang; Yuan-Fang Wang

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Transferring artistic styles onto everyday photographs has become an extremely popular task in both academia and industry. Recently, offline training has replaced on-line iterative optimization, enabling nearly real-time stylization. When those stylization networks are applied directly to high-resolution images, however, the style of localized regions often appears less similar to the desired artistic style. This is because the transfer process fails to capture small, intricate textures and...

Topics: Computer Vision and Pattern Recognition, Computing Research Repository

Source: http://arxiv.org/abs/1612.01895

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31

Sep 18, 2013
09/13

by
Yi-Shi Duan; Li-Da Zhang; Yu-Xiao Liu

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In the light of $\phi$-mapping topological current theory, the structure of cosmic strings are obtained from the Abelian Higgs model, which is an effective description to the brane world cosmic string system. In this topological description of the cosmic string, combining the result of decomposition of U(1) gauge potential, we analytically reach the familiar conclusions that in the brane world scenario the magnetic flux of the cosmic string is quantized and the RR charge of it is screened.

Source: http://arxiv.org/abs/0809.0118v1

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59

Sep 18, 2013
09/13

by
Li-Da Zhang; Yi-Shi Duan; Yu-Xiao Liu

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We derive the exact modified London equation for the two-gap superconductor, compare it with its single-gap counterpart. We show that the vortices in the two-gap superconductor are soft (or continuous) core vortices. In particular, we discuss the topological structure of the finite energy vortices (Abrikosov-like vortices), and find that they can be viewed as the incarnation of the baby skyrmion stretched in the third direction. Besides, we point out that the knot soliton in the two-gap...

Source: http://arxiv.org/abs/0809.0123v1

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48

Sep 18, 2013
09/13

by
Yi-Shi Duan; Li-Da Zhang; Yu-Xiao Liu

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Making use of $\phi$-mapping topological current method, we discuss the self-dual vortices in the Abelian Chern-Simons model with two complex scalar fields. For each scalar field, an exact nontrivial equation with a topological term which is missing in many references is derived analytically. The general angular momentum is obtained. The magnetic flux which relates the two scalar fields is calculated. Furthermore, we investigate the vortex evolution processes, and find that because of the...

Source: http://arxiv.org/abs/0707.1358v2

3
3.0

Jun 30, 2018
06/18

by
Da Zhang; Hamid Maei; Xin Wang; Yuan-Fang Wang

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In this paper we introduce a fully end-to-end approach for visual tracking in videos that learns to predict the bounding box locations of a target object at every frame. An important insight is that the tracking problem can be considered as a sequential decision-making process and historical semantics encode highly relevant information for future decisions. Based on this intuition, we formulate our model as a recurrent convolutional neural network agent that interacts with a video overtime, and...

Topics: Learning, Computing Research Repository, Computer Vision and Pattern Recognition

Source: http://arxiv.org/abs/1701.08936

48
48

Sep 20, 2013
09/13

by
Yan-Hua Zhai; Xi-Hao Chen; Da Zhang; Ling-An Wu

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Two-photon interference and "ghost" imaging with entangled light have attracted much attention since the last century because of the novel features such as non-locality and sub-wavelength effect. Recently, it has been found that pseudo-thermal light can mimic certain effects of entangled light. We report here the first observation of two-photon interference with true thermal light.

Source: http://arxiv.org/abs/quant-ph/0506056v3

2
2.0

Jun 28, 2018
06/18

by
Li-Da Zhang; Xianxin Wu; Heng Fan; Fan Yang; Jiangping Hu

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We investigate the pairing symmetry of the newly synthesized quasi-one-dimension K$_2$Cr$_3$As$_3$ superconductor based on the six-band model. We adopt standard random-phase-approximation to study the Hubbard-Hund model of the system. Our results confirm the conclusions obtained from our previous three-band model: the triplet $p_z$ and $f_{y^3-3x^2y}$ wave pairings serve as the leading pairing symmetries in the weak and strong Hund's rule coupling regimes, respectively. For physically realistic...

Topics: Superconductivity, Condensed Matter

Source: http://arxiv.org/abs/1512.00147

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70

Jul 20, 2013
07/13

by
Yu-Xiao Liu; Li-Da Zhang; Li-Jie Zhang; Yi-Shi Duan

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A class of thick branes in the background of sine-Gordon kinks with a scalar potential $V(\phi)=p(1+\cos\frac{2\phi}{q})$ was constructed by R. Koley and S. Kar [Classical Quantum Gravity \textbf{22}, 753 (2005)]. In this paper, in the background of the warped geometry, we investigate the issue of localization of spin half fermions on these branes in the presence of two types of scalar-fermion couplings: $\eta\bar{\Psi}\phi\Psi$ and $\eta\bar{\Psi}\sin\phi \Psi$. By presenting the...

Source: http://arxiv.org/abs/0804.4553v5

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45

Sep 19, 2013
09/13

by
Yu-Xiao Liu; Xin-Hui Zhang; Li-Da Zhang; Yi-Shi Duan

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In the literatures, several types of thick smooth brane configurations in a pure geometric Weyl integrable 5-dimensional space time have been presented. The Weyl geometry is a non-Riemannian modification of 5-dimensional Kaluza--Klein (KK) theory. All these thick brane solutions preserve 4-dimensional Poincar\'e invariance, and some of them break $Z_2$--symmetry along the extra dimension. In this paper, we study localization of various matter fields on these pure geometrical thick branes, which...

Source: http://arxiv.org/abs/0708.0065v6

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35

Sep 18, 2013
09/13

by
Yu-Xiao Liu; Li-Da Zhang; Shao-Wen Wei; Yi-Shi Duan

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In this paper, we study localization and mass spectrum of various matter fields on a family of thick brane configurations in a pure geometric Weyl integrable 5-dimensional space time, a non-Riemannian modification of 5-dimensional Kaluza--Klein (KK) theory. We present the shape of the mass-independent potential of the corresponding Schr\"{o}dinger problem and obtain the KK modes and mass spectrum, where a special coupling of spinors and scalars is considered for fermions. It is shown that,...

Source: http://arxiv.org/abs/0803.0098v3

5
5.0

Jun 29, 2018
06/18

by
Da Zhang; Yiqi Zhang; Zhaoyang Zhang; Noor Ahmed; Yanpeng Zhang; Fuli Li; Milivoj R. Belić; Min Xiao

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We establish a link between the fractional Schr\"odinger equation (FSE) and light propagation in the honeycomb lattice (HCL) - the Dirac-Weyl equation (DWE). The fractional Laplacian in FSE causes a modulation of the dispersion relation of the system, which in the limiting case becomes linear. In the HCL, the dispersion relation is already linear around the Dirac point, suggesting a possible connection with the FSE. Here, we demonstrate this connection by describing light propagation in...

Topics: Optics, Physics

Source: http://arxiv.org/abs/1610.02597

2
2.0

Jun 29, 2018
06/18

by
Hua Zhong; Yiqi Zhang; Yi Zhu; Da Zhang; Changbiao Li; Yanpeng Zhang; Fuli Li; Milivoj R. Belić; Min Xiao

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We report on transport properties of the super-honeycomb lattice, the band structure of which possesses a flat band and Dirac cones, according to the tight-binding approximation. This super-honeycomb model combines the honeycomb lattice and the Lieb lattice and displays the properties of both. The super-honeycomb lattice also represents a hybrid fermionic and bosonic system, which is rarely seen in nature. By choosing the phases of input beams properly, the flat-band mode of the super-honeycomb...

Topics: Optics, Physics

Source: http://arxiv.org/abs/1608.06365