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Long X.,Shanghai University | Zeng Z.,Shanghai University | Zeng Z.,Shanghai Key Laboratory of High Temperature Superconductors | Guo E.,Shanghai University | And 3 more authors.
Journal of Power Sources | Year: 2016

With the rapid development of wearable and portable electronics, the demand for all-solid-state flexible energy storage devices with high performance, long-term cycling stability and bending stability has been aroused. Physical and chemical method for preparing thin-film materials has enabled planar flexible supercapacitors (SCs) to be fabricated for a variety of applications. In this work, we report on the facile fabrication of an all-solid-state flexible interdigitated supercapacitor with a convenient and efficient two-step method. 3-D nanostructured α-MnO2 has been prepared on the surface of interdigitated Pt metal pattern on polyethylene terephthalate (PET) substrate as high-performance electrode material via in-situ catalytic solution route without any assistance of template or surfactant. The SCs are fabricated with PVA/H3PO4 as solid-state electrolyte, which exhibited good electrochemical performance with areal capacitance as much as 20 mF cm-2 at a scan rate of 10 mV s-1, relatively high energy density (3.6 × 10-7 Wh cm-2-1.9 × 10-6 Wh cm-2) and power density (9 × 10-5 W cm-2-1.6 × 10-4 W cm-2), and excellent long-term cycling stability with capacitance retention of 82.2% (10,000 times charge and discharge), and bending stability with capacitance retention of 89.6%. © 2016 Elsevier B.V. All rights reserved. Source

Lan S.,Beijing Normal University | Tian Y.,University of Chinese Academy of Sciences | Tian Y.,Shanghai Key Laboratory of High Temperature Superconductors | Zhang H.,Beijing Normal University | Zhang H.,Vrije Universiteit Brussel
Journal of High Energy Physics | Year: 2016

Abstract: Motivated by the various indications that holographic superfluid is BCS like at the standard quantization but BEC like at the alternative quantization, we have implemented the alternative quantization in the dynamical holographic superfluid for the first time. With this accomplishment, we further initiate the detailed investigation of quantum turbulence in finite temperature BEC by a long time stable numerical simulation of bulk dynamics, which includes the two body decay of vortex number caused by vortex pair annihilation, the onset of superfluid turbulence signaled by Kolmogorov scaling law, and a direct energy cascade demonstrated by injecting energy to the turbulent superfluid. All of these results share the same patterns as the holographic superfluid at the standard quantization, thus suggest that these should be universal features for quantum turbulence at temperatures order of the critical temperature. © 2016, The Author(s). Source

Yan X.,Shanghai University | Xin Z.,Shanghai University | Xin Z.,Shanghai Key Laboratory of High Temperature Superconductors | Tian L.,Shanghai University | Yu M.,University of Louisville
Computational Materials Science | Year: 2015

Abstract The structural stability and the electronic properties of the SimCn graphyne-like monolayers with 18,18,24-graphyne type of structure have been systematically studied using a transferable and reliable semi-empirical Hamiltonian (referred as SCED-LCAO method). Three stable SimCn graphyne-like structures are obtained including the flat SiC and Si1C9 graphyne-like sheets and the slightly buckled Si2C8 graphyne-like sheet with a small buckling of 0.05 Å. The co-existence of the sp and sp2 types of the hybridization between silicon and carbon atoms is found in these systems. The electronic properties of these systems are found to be highly dependent on the stoichiometry of C and Si elements. The flat SiC and Si1C9 graphyne-like monolayers have semi-conductor properties with the energy gap of 0.955 eV and 0.689 eV, respectively. The slightly buckled Si2C8 graphyne-like monolayer, on the other hand, behaves like a tiny gap material. © 2015 Elsevier B.V. Source

Wu J.-P.,Bohai University | Wu J.-P.,Shanghai Key Laboratory of High Temperature Superconductors
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2016

In this letter, we systematically explore the holographic (non-)relativistic fermionic spectrum without/with dipole coupling dual to Born-Infeld anti-de Sitter (BI-AdS) black hole. For the relativistic fermionic fixed point, this holographic fermionic system exhibits non-Fermi liquid behavior. Also, with the increase of BI parameter γ, the non-Fermi liquid becomes even "more non-Fermi". When the dipole coupling term is included, we find that the BI term makes it a lot tougher to form the gap. While for the non-relativistic fermionic system with large dipole coupling in BI-AdS background, with the increase of BI parameter, the gap comes into being again. © 2016 The Author. Source

Guo M.,Beijing Normal University | Lan S.,Beijing Normal University | Niu C.,Gwangju Institute of Science and Technology | Tian Y.,University of Chinese Academy of Sciences | And 3 more authors.
Classical and Quantum Gravity | Year: 2016

In this note, we have addressed various issues on zero temperature holographic superfluids. First, inspired by our numerical evidence for the equality between the superfluid density and particle density, we provide an elegant analytic proof for this equality by a boost trick. Second, using not only the frequency domain analysis but also the time domain analysis from numerical relativity, we identify the hydrodynamic normal modes and calculate out the sound speed, which is shown to increase with the chemical potential and saturate to the value predicted by the conformal field theory in the large chemical potential limit. Third, the generic non-thermalization is demonstrated by the fully nonlinear time evolution from a non-equilibrium state for our zero temperature holographic superfluid. Furthermore, a conserved Noether charge is proposed in support of this behavior. © 2016 IOP Publishing Ltd. Source

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