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【期刊论文】Electronic states of Si (100) reconstructed surfaces
朱梓忠, Zizhong Zhu, * Nobuyuki Shirna, and Masaru Tsukada
,-0001,():
-1年11月30日
The detailed electronic structures and geometries of Si(100) reconstructed surfaces are investigated by a self-consistent calculation with a norm-conserving nonlocal pseudopotential. We concentrate on the dimer model and on (2
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朱梓忠, Zizhong Zhu, Shudun Liu, and George K. Horton E. Roger Cowley
,-0001,():
-1年11月30日
A technique based on the path-integral effective-potential theory to calculate the thermodynamic properties of a linear chain of atoms is extended to include all-neighbor interactions. The configuration averages are performed using the classical Monte Carlo technique. The theory is applied to a system interacting with a Mie-Lennard-Jones potential to make contact with earlier work. Results for the internal energy and specific heat are presented and compared with those using only nearest-neighbor interactions and the quantum Monte Carlo method. This is a useful step toward the application of the effective-potential theory to realistic systems with long-range interactions.
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【期刊论文】Fractional Fourier transform and the elliptic gradient-index medium
朱梓忠, Li Yu , Meichun Huang, Liqing Wu, Yingyang Lu, Wenda Huang, Mouzhi Chen, Zhizhong Zhu
Optics Communications 152(1998)23-25,-0001,():
-1年11月30日
We demonstrate that the propagation of a light wave in an elliptic gradient-index medium can be regarded as a joint fractional Fourier transform. The distinctive features of the Wigner distributon function and the recurrence of the original function are analyzed qualitatively. q1998 Elsevier Science B.V. All rights reserved.
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【期刊论文】The Laguerre-Gaussian series representation of two-dimensional fractional Fourier transform
朱梓忠, Li Yu, Wenda Huang, Meichun Huang, Zizhong Zhu, Xiaoming Zeng and Wei Ji
J. Phys. A: Math. Gen. 31(1998)9353-9357. Printed in the UK,-0001,():
-1年11月30日
In this paper the Laguerre-Gaussian (LG) series representation of the twodimensional fractional Fourier transform is derived from conventional ordinary Fourier transform in polar coordinates. The kernel of this series representation is constituted by Laguerre-Gaussian functions, from which the series representation of a fractional Hankel transform can be easily derived. The connection between the gradient-index medium and the LG series representation is illustrated as an example of its applications.
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【期刊论文】Theoretical study of valence-band offsets of strained Si1-x-yGexCy/Si(001) heterostructures
朱梓忠, Liqing Wu a) and Meichun Huang, Shuping Li, Zizhong Zhu, and Baohuang Zhuang
,-0001,():
-1年11月30日
We present a theoretical study of the valence-band offsets (VBOs) of the pseudomorphic Si1-x-yGexCy/Si(001) heterojunctions. Our calculation is based on the ab initio pseudopotential method, the virtual-crystal approximation, and the average-bond-energy theory. It is found that the VBO is sensitive to the strain condition. Initial addition of carbon increases the VBO of the relaxed Si12x2yGexCy/Si(001) heterostructures. For constant Ge fraction, the VBO decreases and increases with increasing the C fraction in the case of the compressive and tensile strains, respectively. The trends of our results are in agreement with those of other theoretical and experimental results.
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