In the last 30 days

• Open/close Regular Small-World Network

  Zou Zhi-Yun et al 2009 Chinese Phys. Lett. 26 110502 Tag this article

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  According to the deficiencies in Watts and Strogatz's small-world network model, we present a new regular model to establish the small-world network. Besides the property of the small-world, this model has other properties such as accuracy in controlling the average shortest path length L, and the average clustering coefficient C, also regular network topology as well as enhanced network robustness. This method improves the construction of the small-world network essentially, so that the regular small-world network closely resembles the actual network. We also present studies on the relationships among the quantities of a variety of edges, L and C in regular small-world network in detail. This research lays the foundation for the establishment of the regular small-world network and acts as a good guidance for further research of this model and its applications.

• Open/close Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O_1-xF_x] FeAs

  Ren Zhi-An et al 2008 Chinese Phys. Lett. 25 2215 Tag this article

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  We report the superconductivity in iron-based oxyarsenide Sm[O _{1- x}F _x ]FeAs, with the onset resistivity transition temperature at 55.0K and Meissner transition at 54.6 K. This compound has the same crystal structure as LaOFeAs with shrunk crystal lattices, and becomes the superconductor with the highest critical temperature among all materials besides copper oxides up to now.

• Open/close N-Soliton Solutions for the Four-Potential Isopectral Ablowitz—Ladik Equation

  Chen Shou-Ting (陈守婷) et al 2011 Chinese Phys. Lett. 28 060202 Tag this article

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  The bilinear form of the four-potential isospectral Ablowitz—Ladik (AL) equation is derived by the dependent variable transformation. The N-soliton solutions of the equation are obtained through the Hirota method. Moreover, the double Casoratian solution is found by means of the double Casoratian technique.

• Open/close A Wide-Band Metamaterial Absorber Based on Loaded Magnetic Resonators

  Gu Chao (顾超) et al 2011 Chinese Phys. Lett. 28 067808 Tag this article

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  A wide-band polarization-insensitive and wide-angle metamaterial absorber based on loaded magnetic resonators is presented. The unit cell of this absorber consists of a magnetic resonator loaded with lumped resistances, a dielectric substrate and a back metal film. Theoretical and simulated results show that this absorber has a wideband strong absorption for the incident wave from 3.87 GHz to 21.09 GHz. Simulated absorbance values under loading and unloading conditions indicate that electrocircuit's resonances are more stable than electromagnetic resonances and thus can be used to realize wide-band absorption. Simulated absorbance values under different polarization angles and different angles of incidence indicate that this absorber is polarization-insensitive and wide-angle. It may have potential applications in military fields.

• Open/close Investigation of a GaN Nucleation Layer on a Patterned Sapphire Substrate

  Wu Meng (吴猛) et al 2011 Chinese Phys. Lett. 28 068502 Tag this article

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  A low-temperature GaN (LT-GaN) nucleation layer is grown on a patterned sapphire substrate (PSS) using metal-organic chemical vapor deposition (MOCVD). The surface morphology of the LT-GaN is investigated and the selective nucleation phenomenon in the growth process of the LT-GaN nucleation layer is discovered. Meanwhile, effects of thickness of the LT-GaN and the annealing process on the phenomenon are also discussed. A pattern model is also proposed to analyze the possible mechanisms in atomic scale.

• Open/close A Multifrequency Cloak with a Single Shell of Negative Index Metamaterials

  Li Pei-Ning (李培宁) et al 2011 Chinese Phys. Lett. 28 064206 Tag this article

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  We propose an invisibility multifrequency cloak with a single shell of negative index metamaterials (NIMs) based on the scattering cancellation cloaking theory. Theory and simulation results show that the cloak can reduce the total scattering cross section at multiple frequencies by exploiting the frequency dispersion of the permittivity and permeability simultaneously. It may provide a potential way to design a multifrequency cloak.

• Open/close Ground States and Excited States in a Tunable Graphene Quantum Dot

  Wang Lin-Jun (汪林俊) et al 2011 Chinese Phys. Lett. 28 067301 Tag this article

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  We prepare an etched gate tunable quantum dot in single-layer graphene and present transport measurement in this system. We extract the information of the ground states and excited states of the graphene quantum dot, as denoted by the presence of characteristic Coulomb blockade diamond diagrams. The results demonstrate that the quantum dot in single-layer graphene bodes well for future quantum transport study and quantum computing applications.

• Open/close Defect-Related Photoresponse and Polarization-Sensitive Photodetection of Single ZnO Nanowires

  Liao Zhi-Min et al 2008 Chinese Phys. Lett. 25 2622 Tag this article

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  Defect-related photoconductivity of single ZnO nanowires is investigated. The photoconductivity shows power-law dependence with incident green laser intensity due to the defect mechanisms including both recombination centres and traps. The device based on single ZnO nanowire shows a sensitive photoresponse to green light with significant on/off ratios. In addition, the photocurrent is highly sensitive to the polarization of the incident illumination. Therefore, the nanowire may act as a polarized photodetector.

• Open/close Bilinear Bäcklund Transformation for a Variable-Coefficient Kadomtsev—Petviashvili Equation

  Wu Jian-Ping (吴建平) 2011 Chinese Phys. Lett. 28 060207 Tag this article

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  Resorting to the Hirota bilinear form, a bilinear Bäcklund transformation (BT) is obtained for a variable-coefficient Kadomtsev—Petviashvili equation. As applications, based on the resulting bilinear BT, single-soliton solutions and two-soliton solutions together with their soliton characteristics are presented for the equation. Furthermore, starting from the bilinear BT, a Lax pair and a new variable-coefficient (2+1)-dimensional nonlinear evolution equation is derived.

• Open/close Withdrawal of Chinese Physics Letters 26 (2009) 114209 "A Sensitive Scheme to Observe Weak Photo-Refraction Effects in Some Nonlinear Optical Crystals Pumped by Ultrashort Optical Pulses"

  Xu Shi-Xiang (徐世祥) 2011 Chinese Phys. Lett. 28 069901 Tag this article

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