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On the Scaled Fractional Fourier Transformation Operator

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Chinese Physics Letters 2008年第2期25卷 513-516页

作者：范洪义胡利云 Department of Physics Shanghai Jiao Tong University Shanghai 200030

Based on our previous study [Chin. Phys. Lett. 24 （2007） 2238] in which the Fresnel operator corresponding to classical Fresnel transform was introduced, we derive the fractional Fourier transformation operator, and... 详细信息

关键词： pulsars x-ray spectra relativity and gravitation redshift

An All-Thin-Film Electrochromic Device Composed of MoO3-LiBSO-NiOx Multilayer Structure

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Chinese Physics Letters 2008年第2期25卷 740-742页

作者：杨海刚王聪朱开贵刁训刚王怀义崔毅王天民 Center for Condensed Matter and Materials Physics School of Science Beihang University Beijing 100083

An all-thin-tilm （ATF） electrochromic device for modulating the optical transmittance is manufactured using magnetron sputtering. The devices consists of MoO3 as the main electrochromic layer, LiBO2 ＋Li2SO4 （LiBSO） as the ion conductor layer, and NiOx as the complementary electrochromic layer. Glass covered with indium tin oxide （ITO） is used as the substrate and the ITO film is used as the bottom electrode. The ITO film deposited on the top of the devices is used as the other electrode. The structure and morphology of the films are characterized by x-ray diffraction （XRD） and scanning electron microscopy （SEM）. The devices exhibit good optical properties with low transmittance values in the coloured state, and the optical modulation is measured by spectrophotometer in the wavelength range from 400 to 800nm. The average visible light transmittance reaches 50.2% and 3.7% in bleached and coloured state, respectively. The results indicate that such a monolithic system has great potential to be applied in smart windows.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Single-Photon Emission from a Single InAs Quantum Dot

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Chinese Physics Letters 2008年第2期25卷 501-504页

作者：窦秀明孙宝权黄杜松倪海桥牛智川 SKLSM Institute of Semiconductors Chinese Academy of Sciences PO Box 912 Beijing 100083

Excitation power-dependent micro-photoluminescence spectra and photon-correlation measurement are used to study the optical properties and photon statistics of single InAs quantum dots. Exciton and biexciton emissions, whose photoluminescence intensities have linear and quadratic excitation power dependences, respectively, are identified. Under pulsed laser excitation, the zero time delay peak of second order correlation function corresponding to exciton emission is well suppressed, which is a clear evidence of single photon emission.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Design of Broadband Single Fundamental Mode Hollow Core Bragg Fibre

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Chinese Physics Letters 2008年第2期25卷 570-573页

作者：林晨曦张巍黄翊东彭江得 Department of Electronics Engineering Tsinghua University Beijing 100084

The condition of the single fundamental mode （HE11） transmission in hollow core Bragg fibres is investigated theoretically by the transfer matrix method. The influences of core size and cladding parameters on the single HE11 mode bandwidth are analysed, showing that the maximal bandwidth is more sensitive to the core size than the cladding. The numerical results show that sufficiently broad bandwidth of single HE11 mode transmission can be achieved by proper fibre design. A simple and fast method based on improved hollow metal waveguide model is proposed to optimize fibre structure parameters for the maximal single HE11 mode bandwidth.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Negativity in the Extended Hubbard Model under External Magnetic Field

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Chinese Physics Letters 2008年第1期25卷 31-34页

作者：杨桢宁文强 Department of Physics Fudan University Shanghai 200433 Department of Physics Chinese University of Hong Kong Hong Kong

We exactly calculate the negativity, a measurement of entanglement, in the two-site extended Hubbard model with external magnetic field. Its behaviour at different temperatures is presented. The negativity reduces with the increasing temperature or with the increasing uniform external magnetic field. It is also found that a non-uniform external magnetic field can be used to modulate or to increase the negativity.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Remote Preparation of Photon Polarization States within a Network

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Chinese Physics Letters 2008年第1期25卷 20-23页

作者：樊秋波 College of Mathematics and Physics Xuzhou Institute of Technology Xuzhou 221008

We propose a new linear optical protocol for remote state preparation （RSP） between two parties under control of a number of controllers in terms of optical elements. The realization of this protocol is appealing due to the fact that the quantum state of light is robust against the decoherence, and photons are ideal carriers for transmitting quantum information over long distances.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Asymptotic Analysis of Vertical Branch-Cut Integral of Shear Waves in a Fluid-Filled Borehole Utilizing the Steepest-Descent Method

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Chinese Physics Letters 2008年第2期25卷 578-581页

作者：姚桂锦宋若龙王克协 College of Communication Engineering Jilin University Changchun 130012 School of Physics Jilin University Changchun 130021

We obtain an asymptotic solution to the vertical branch-cut integral of shear waves excited by an impulsive pressure point source in a fluid-filled borehole, by taking the effect of the infinite singularity of the Hankel functions related to shear waves in the integrand at the shear branch point into account and using the method of steepest-descent to expand the vertical branch-cut integral of shear waves. It is theoretically proven that the saddle point of the integrand is located at ks-i/z, where ks and z are the shear branch point and the offset. The continuous and smooth amplitude spectra and the resonant peaks of shear waves are numerically calculated from the asymptotic solution. These asymptotic results are generally in agreement with the numerical integral results. It is also found by the comparison and analysis of two results that the resonant factor and the effect of the normal and leaking mode poles around the shear branch point lead to the two-peak characteristics of the amplitude spectra of shear waves in the resonant peak zones from the numerical integral calculations.

关键词： pulsars x-ray spectra relativity and gravitation redshift

A Measure for Isotropy-Equilibrium Degree of a Multi-Particle System

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Chinese Physics Letters 2008年第2期25卷 447-450页

作者：刘智春李润泽许明梅刘连寿 College of Physical Science and Technology Huazhong Normal University Wuhan 430079

Aiming at using sphericity as a tool to study the isotropy-equilibrium property of a multi-particle system, in particular the hadronic final state IFS produced in instanton-induced DIS events, we discuss in detail the dependence of sphericity on multiplicity and the multiplicity distribution, as well as on the isotropy degree of the system. A rotational symmetric model with a fluctuating isotropy-degree is constructed, which can fit the mean and width of sphericity of the Monte Carlo IFS-results simultaneously. The IFS from the Monte Carlo simulation is found to be not ideally isotropic but has a probability of 4.7% to be isotropic within error of 5%. The results provide us a description of how far the IFS departs from equilibrium. The method developed is applicable to any Monte Carlo generated multi-particle system, for which the isotropy-equilibrium property is significant.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Minority Carrier Lifetime in As-Grown Germanium Doped Czochralski Silicon

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Chinese Physics Letters 2008年第2期25卷 651-653页

作者：朱鑫杨德仁李明陈涛汪雷阙端麟 State Key Laboratory of Silicon Materials and Department of Material Science and Engineering Zhejiang University Hangzhou 310027

The minority carrier lifetime of as-grown germanium-doped Czochralski （GCZ） silicon wafers doped with germanium concentrations [Ge]=10^16-10^18 cm^-3 is investigated in comparison with conventional CZ silicon samples. It is found that the lifetime distribution along the ingot changes with the variation of[Ge]. There is a critical value of [Ge] = 10^16 cm^-3 beyond which Ge can obviously influence the lifetime of as-grown ingots. This phenomenon is considered to be associated with the competition or combination between the oxygen related thermal donors （TDs） and electrically active Ge-related complexes. The related formation mechanisms and distributions are also discussed.

关键词： pulsars x-ray spectra relativity and gravitation redshift