The concentration wave method is used to determine the ordered structures appearing in the epilayers of III-V semiconductor alloys. Based on a two-dimensional planar model, possible ordered structures of zinc-blende structure are deduced. Some experimental features are explained. Phase diagrams of interaction parameters are given.

Ni Jun;Lai Xinchun;Gu Binglin

Journal of Applied Physics

1993

The ordered phases in the three-state antiferromagnetic Potts model for different lattices are investigated using the cluster-variation method in the pair approximation. There are two types of low-temperature ordered phases. The intermediate-temperature ordered phases are also analyzed. © 1999 Elsevier Science B.V. All rights reserved.

Ni Jun;Gu Binglin

Physics Letters Section A General Atomic and Solid State Physics

1999

On the basis of the dielectric continuum model, the optical phonon modes and related dispersion relations in GaAsGa1-xAlxAs quantum well structures with chemical composition fluctuations at the interfaces are investigated. The dependence of the modes on chemical composition fluctuations and their symmetry is clearly demonstrated. © 1995.

Duan Wenhui;Zhu Jia-Lin;Gu Bing-Lin;Wang Chongyu

Physics Letters A

1995

The kinetics of ordering in a (001) deposition monolayer in fcc alloy system is investigated by means of the micromaster equation method in the pair approximation. The time evolutions of the long-range order (LRO) and short-range order (SRO) parameters are calculated. There are transient ordered states during the relaxation from the disordered state to the equilibrium state. The transient ordered states have various features are due to different characteristic times for the atomic migration, the different first- and second-nearest- neighbors interactions, the different influence of short-range correlation and long-range correlation on relaxation.

Shi Hong-Ting;Ni Jun;Gu Bing-Lin

Wuli Xuebao Acta Physica Sinica

2001

Electronic states and tunneling properties in step-barrier structures have been investigated. The results indicate that there exists quasibound states in step-barrier structure both at zero bias and under an applied bias. Size effect on negative-differential resistances is examined and the condition for obtaining larger current peak-to-valley ratios has been discussed. © 1999 Elsevier Science B.V. All rights reserved.

Guo Yong;Gu Bing-Lin;Zeng Zhong;Kawazoe Yoshiyuki

Physics Letters Section A General Atomic and Solid State Physics

1999

The electronic structures of metallo-carbohedrenes M m C n , a new class of molecular clusters, have been investigated using the universal parameter tight-binding method. The authors have studied the cases of different transition metals M (M=Ti, V, Zr) with single-cage structure and unusual double-cage structure and triple-cage structures.

Liu Jing-Nan;Gu Bing-Lin

Journal of Physics Condensed Matter

1993

Using the scattering-matrix method, we investigate the acoustic photon ballistic transmission and thermal conductivity in a dielectric quantum wire structure. We find that the transmission coefficient and the thermal conductivity are of quantum character, and sensitively depend on the geometric parameters and material nature of the structure. The transmission coefficient of the single acoustic phonon mode with differing frequency has different dependence on geometric configurations. Our results show that by adjusting the structural parameters and material nature one can control the thermal conductivity of the structure to match practical requirements in devices.

Li Wen-Xia;Chen Ke-Qiu;Duan Wenhui;Wu Jian;Gu Bing-Lin

Journal of Physics D Applied Physics

2003

The structural phase diagrams of complex perovskites have been studied within the mean-field approximation. Various phase diagrams with possible topological structures of the 1/2{111}-, 1/ 2{110}-, and 1/2{100}-type ordered structures are obtained. The 1/2{111}- and 1/2{100}-type ordered structures have similar phase diagrams and their ordering transitions are both of the second kind, while the 1/2{110}-type ordered structure has a more complex phase diagram and its ordering transition is of the first kind. In the two-phase region of the phase diagram, the ordered phase's composition deviates from that of the chemical formula towards the completely ordering composition which is 0.5 for the 1/2{111}-, 1/2{100}-type ordered structures and 0.25, 0.50, 0.75 for the 1/2{110}-type ordered structures. © 1999 American Institute of Physics.

Gu Bing-Lin;Liu Zhi-Rong;Gui Hong;Zhang Xiao-Wen

Journal of Applied Physics

1999

We compare the electronic structures of undoped and Br-doped finitely long single-wall carbon nanotubes. Doping with bromine modifies the electronic structure of pure tubes in three ways. The total electronic density shifts from the tubes to the dopant agree with the experimental results, as may open a new way to tuning the quantum-transport and field-emissive properties of carbon nanotubes. © 1998 Published by Elsevier Science Ltd.

Yuan Ling-Feng;Gu Bing-Lin

Solid State Communications

1998

The electronic structure of single-walled carbon nanotube (SWNT) in the growth is studied by using the first-principle discrete variable calculations. We find the electronic structure of the mouth is remarkably different from that of the body due to dangling bonds. The corresponding valence electrons not only directly change the bonding model of the mouth, strengthen the bonding between carbon atoms and induce carbon atoms shift to tube core along the radial, which is in good agreement with the morphology of perfect tip observed in the experiments, but also reduce the chemical stability of carbon nanotube. The electronic structure differing from the closed carbon nanotube determines the different operation behavior of carbon nanotube in the growth in the synthesis of nano-material.

Zhou Gang;Duan Wen-Hui;Gu Bing-Lin

Kao Teng Hsueh Hsiao Hua Heush Hsueh Pao Chemical Journal of Chinese Universities

2001