Chin. Phys. B
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ISSN 1674-1056 (Print)
CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1993, Vol.2, No.6
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GENERAL

PHASE PROPERTIES OF THE RADIATION FIELDS IN RAMAN PROCESS

ZHOU PENG
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 401-408 doi: 10.1088/1004-423X/2/6/001
Full Text: [PDF 189 KB] (Downloads:273)
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The general evolution of the interaction of two radiation fields with an effective two-level atom via the Raman-type transitions is presented. Using the Pegg-Barnett phase theory, the joint phase probability distribution of the two field modes, phase average values and phase fluctuations are studied in detail. Also, the effect of the presence of a field on the phase properties of the other mode is examined.

ONE-DIMENSIONAL SANDPILE MODEL WITH STOCHASTIC SLIDE

OUYANG HUA-FU, Lü YAN-NAN, DING E-JIANG
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 409-422 doi: 10.1088/1004-423X/2/6/002
Full Text: [PDF 304 KB] (Downloads:315)
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A new kind of theoretical one-dimensional sandpile model is proposed. In contrast to the models studied previously, the sliding process in this model is assumed to be of stochastic nature. Numerical simulations show that the behavior of this model is apparently closer to the reality of true sandpile than the models considered previously. The universality and sealing of this model is also discussed.
CLASSICAL AREAS OF PHENOMENOLOGY

CAPABILITY OF THE GUIDING-CENTRE SOLITON COMMUNICATION SYSTEM

CHEN JIAN, YANG XIANG-LIN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 430-438 doi: 10.1088/1004-423X/2/6/004
Full Text: [PDF 224 KB] (Downloads:271)
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Features of optical pulse transmission in a guiding-centre soliton communication system are discussed. The pulse centre jitter and energy fluctuation due to ASE noise in optical amplifiers of the system and the relationships between these effects and the parameters of the system are analyzed. Capability of the maxi-mum length-bit-rate product is estimated, and the capability of the system is compared with that of the common lumped energy compensated system.
ATOMIC AND MOLECULAR PHYSICS

STRUCTURES OF Si AND Ge CLUSTERS UNDER MODIFIED STILLINGER-WEBER POTENTIAL

WANG JIAN, ZI JIAN, ZHANG KAI-MING, XIE XI-DE
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 423-429 doi: 10.1088/1004-423X/2/6/003
Full Text: [PDF 218 KB] (Downloads:323)
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Structural behaviors of silicon and germanium clusters under the recently proposed modified Stillinger-Weber (SW) potential have been studied by molecular dynamics method along with the con-jugate-gradient optimization. Since the SW potentials have been derived from the properties of bulk materials, it gives relatively large discrepancy when the cluster number is small, e.g. n=3 and 4. When n>4, the ground-state structures under the modified SW potential are close to that from the first-principle calculation. The binding energies are also improved under the modified SW potential. These results may be attributed to the relative enhancement of the two-body term over the three-body term in the modified SW potential, which leads to structures with a preferential coordination number 4. Structural behaviors of germanium clusters are similar to those of silicon.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

COMPUTATION ON HEAT OF FORMATION AND EOS OF ALLOY BY A REFINED TFD MODEL

CHENG SU-YU, CHENG KAI-JIA
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 439-448 doi: 10.1088/1004-423X/2/6/005
Full Text: [PDF 239 KB] (Downloads:307)
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A new method of calculation of EOS and heat of formation of alloy by a modified TFD model is proposed. For elements, only their specific volumes at zero pressure and temperature are required as basic parameters, and the quantum corrections to the kinetic energy are admitted for a better accuracy in later calculations. Nothing more is demanded to be known a priori. Thus computations and analyses for some binary alloys such as Al-Cu, Al-Ni and Al-Co on their EOS as well as heat of formation have been car-ried out in detail. Results obtained are in good agreement with measurements. The theory also provides an explanation for the Miedema's empirical relations between the heat of formation and the eletronic characteristics in alloys. In a subsequent paper it will be shown that there is an intimate correlation between the present theory and the covalent bond theory of Pauling and Yu. It is quite plausible that the TFD model has far wider fields of application and may serve as a probe to both research and design of materials.

RENORMALIZED HALL CONDUCTIVITY FOR MAGNETIC ALLOYS

YI LIN, YAO KAI-LUN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 449-457 doi: 10.1088/1004-423X/2/6/006
Full Text: [PDF 193 KB] (Downloads:342)
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By means of the renormalized vertex procedure for the motion Green's function developed by the au-thors, the vertex function of magnetic alloys, based on the s-d exchange interaction, is solved exactly and the corresponding Hall conductivity tensors are obtained. It is found that the renormalized modification of the conductivity is very important in the cases of not too weak extermal magnetic field and slow relexaction time.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

CRITICAL TEMPERATURE FOR A MODEL QUASI-ONE-DIMENSIONAL DISORDERED SUPERCONDUCTOR

YI LIN, XIAO YI, YAO KAI-LUN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (6): 458-463 doi: 10.1088/1004-423X/2/6/007
Full Text: [PDF 131 KB] (Downloads:283)
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With the help of the decimation ansatz of the renormlization group, the dependence of critical temperature on a transverse magnetic field is calculated analytically for a quasi-one-dimensional disordered superconductor model, based on the de Gennes-Skal-Shklovskii (dGSS) picture of the large cluster in a percolation system. Our results are in good agreement with those given by Halley's scaling theory.
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