Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1999, Vol.8, No.11
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GENERAL

THEORETICAL CALCULATION ON THE PAIR POTENTIALS BETWEEN LIGHT RARE-EARTH METALLIC ATOMS

YANG SHI-QING, ZHANG WEN-XU, GONG JIE, ZHANG WAN-LI, WANG HAO-CAI
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 801-807 doi: 10.1088/1004-423X/8/11/001
Full Text: [PDF 170 KB] (Downloads:288)
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In order to calculate the pair potentials between light rare-earth metallic atoms with double hexagonal close-packed (dhcp) crystal structure, a M?bius inversion transform formula for the dhcp structure is proposed. The pair potentials for the light rare-earth atoms are calculated by this formula. These pair potentials are fitted to the analytic Morse-type potential expressions.

THE TRANSITION RATE OF A DOUBLE WELL SYSTEM DRIVEN BY CROSS-CORRELATED NOISES

MEI DONG-CHENG, CHEN LUO-EN, XUE GUANG-ZHONG, CAO LI, WU DA-JIN
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 808-812 doi: 10.1088/1004-423X/8/11/002
Full Text: [PDF 136 KB] (Downloads:309)
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The transition rate of a double well system driven by cross-correlated noises has been investigated, in when the correlation times between the noises are nonzero. From numerical computation, we find followings: (1) The transition rate decreases as the ,λ(λ is the strength of the correlations between noises) increases. (2) The transition rate increases as the τ(τ is the correlation time between noises) increases. It imglies that τ and λ play opposite roles in the transition rate of the system (3). For the case of perfectly correlated noises (λ= 1), there is no the suppressed phenomenon in the double well system with cross-correlated noise sources.
CLASSICAL AREAS OF PHENOMENOLOGY

GENERATION OF ARBITRARY QUANTUM STATE VIA ATOMIC FEEDBACK

FENG XUN-LI, ZHANG QING-HUA, GONG SHANG-QING, XU ZHI-ZHAN
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 826-830 doi: 10.1088/1004-423X/8/11/005
Full Text: [PDF 133 KB] (Downloads:572)
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We present a scheme to realize the arbitrary control of the time evolution of an atom-cavity system via atomic feedback for the generation of an arbitrary quantum state. The scheme does not need to detect the atomic state, thus the uncontrollable measurement can be avoided.

MODELING AND SCALING OF CHIELECTRIC RELAXATION OF NONLINEAR OPTICAL POLYMERS IN FREQUENCY DOMAIN

SHI WEI, FANG CHANG-SHUI, PAN QI-WEI, SUN XUN, GU QING-TIAN, XU DONG
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 831-837 doi: 10.1088/1004-423X/8/11/006
Full Text: [PDF 186 KB] (Downloads:291)
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chielectric relaxation theory was demonstrated, chielectric relaxation that selectively probes chromophore reorientation in the frequency domain was described by the Havriliak Negami(HN) function, chielectric spectra of several nonlinear optical (NLO) polymers were fitted well by the HN function. To describe the scaling of chromophore reorientation relaxation in frequency domain, two-shape parameters m and n describing the low- and high- frequency wings of the chielectric spectra need to be specified, besides the chielectric characteristic relaxation time τ and the chielectric strength Δχ(2). From the temperature dependences of m and n of NLO polymers, the relations between the chromophore relaxation and the a relaxation of the polymer host have been revealed.

NOVEL ANALYTIC THEORY FOR ACTIVELY MODE-LOCKED FIBER LASER

CHANG GUO-QING, LUO CAI-YUN, LI YU-HUA, GAO YI-ZHI
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 838-844 doi: 10.1088/1004-423X/8/11/007
Full Text: [PDF 155 KB] (Downloads:322)
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The time-domain ABCD matrix formalism is based on the propagation of a Gaussian pulse which is characterized by the pulsewidth and chirp. In this paper, the time-domain ABCD matrix of th SPM (self phase modulation) is perfected so as to acquire more information. With the time-domain ABCD matrices of amplitude modulation, filtration from the optical bandpass, group velocity dispersion and SPM, the detailed characteristics of actively mode-locked fiber laser are described and the steady-state solutions are derived for two simple cases. The application of the formalism is also helpful to understand the mechanism of mode-locking in an actively mode-locked fiber laser.
ATOMIC AND MOLECULAR PHYSICS

LUMINESCENCE OF Bi3+ and Eu2+ DOUBLE CENTERS DOPED IN CaS HOST

JIA DONG-DONG, WU BO-QUN, ZHU JING
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 813-819 doi: 10.1088/1004-423X/8/11/003
Full Text: [PDF 189 KB] (Downloads:252)
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In this work, double-center.doped luminescent material CaS:Bi3+, Eu2+ was made via flux NH4Cl by sintering in excess sulfur environment. The sample had a purplish red net luminescent color. Excitation spectra at both red, 650 nm and blue, 487 nrn were taken. The red emission from Eu2+ center was mainly come from the 4f65d1 absorption in the CaS host. The blue emission from the Bi3+ center on the other hand showed no big difference from the singly doped CaS:Bi3+ materials in excitation spectrum. Emission spectra were obtained at excitaton of 270nm and 300nm. Stokes shift was moved about 20-30nm, under different point excitation. Emission peaks of both Bi3+ and Eu2+ centers appeared at 463nm, 642.5nm by 270nm excitation and 487 nm, 620 nm by 300 nm excitation respectively. After-glow decay cures were also obtained and the shapes of decay curves are similar and it is due to the single hole-trap system by lattice defects.

A NEW APPROACH TO STRUCTURES OF NICKEL CLUSTERS

LUO CHENG-LIN, ZHOU YAN-HUAI
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 820-825 doi: 10.1088/1004-423X/8/11/004
Full Text: [PDF 173 KB] (Downloads:412)
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A transferable tight-binding potential for nickel was used with molecular-dynamics methods and simulated-annealing techniques to study the structure properties of nickel clusters Nin (n≤55), The mean coordination number and structure of some clusters and their relative stability have been obtained.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

SIZE AND SHAPE DEPENDENCE OF THE LOWEST CONDUCTION BAND STATES IN GaAs QUANTUM DOTS

ZHAO GUO-NIAN, XIAN-YU HAI-QING, SONG JIAN, LI XIAO-BAI, REN SHANG-YUAN
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 845-852 doi: 10.1088/1004-423X/8/11/008
Full Text: [PDF 253 KB] (Downloads:262)
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Using a recently developed new scheme, we investigated the electronic structure of the lowest conduction band states of cuboid GaAs quantum dots with different shapes and sizes in a wide range from 4 to 120a (a is the lattice constant). The critical edge length of the direct/indirect crossover in GaAs cuboid quantum dots depends on the size and shape of the quantum dots. As a deduction we also discussed the critical size of dlrect/indirect transition in GaAs quantum wires and thin films.

A NEW METHOD TO ENHANCE THE MAGNETISM OF Fe OVERLAYER ON GaAs(100): SULFUR PASSIVATION USING CH3CSNH2

XU PENG-SHOU, GUO HONG-ZHI, ZHANG FA-PEI, LU ER-DONG, XU FA-QIANG, PAN HAI-BIN, ZHANG XIN-YI
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 853-859 doi: 10.1088/1004-423X/8/11/009
Full Text: [PDF 214 KB] (Downloads:266)
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Ferromagnetic resonance (FMR) has been used to investigat the magnetism of Fe overlayer on S-passivated GaAs(lO0) pretreated by CH3CSNH2. Comparing with the magnetism of Fe overlayer on clean GaAs(100), we find that sulfur passivation can prevent Aa diffusion into Fe overlayer and weaken the interaction of As and Fe. It results in enhancing the magnetism of Fe overlayer on GaAs(100). We also investigate the effects of the pre-annealing of S- pasaivated GaAs(100) substrate on the magnetism of Fe overlayers. The results show that the maximum effective magnetization can be obtained at annealing temperature of 400℃. According to the experimental results of synchrotron radiation photoemission, it can be explained by the change of chemical composition and surface structure of the passivation layer on GaAs(100) surface after the annealing.

NON-EQUILIBRIUM MICROWAVE RESPONSE OF Yba2Cu3O7-δ GRANULAR THIN FILMS UNDER MAGNETIC FIELDS

ABBAS A.ESSA, XU KE-XI, ZHOU SHI-PING, BAI JIA-SHAN
Acta Phys. Sin. (Overseas Edition), 1999, 8 (11): 860-868 doi: 10.1088/1004-423X/8/11/010
Full Text: [PDF 288 KB] (Downloads:318)
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Microwave responses of YBa2Cu3O7-δ(YBCO) granular film have been studied at the microwave frequency of 30.5 GHz. In the absence of a magnetic field the dependence of a normal microwave response on the bias current is observed at a temperature close to Tc. When a magnetic field ranged from 5.0 mT to 33.0 mT is applied, the responses broaden and shift toward a lower temperature. In the superconducting state, the responses were found to be highly dependent on the magnetic field. For the current equal to 5.0mA and a magnetic field above 17.0mT the response increases and did not vanish even at a very low temperature, the fact is believed to be correlated to the anisotropic character of the structure.
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