Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1993, Vol.2, No.4
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GENERAL

ASYMPTOTIC EXPANSION OF GREEN FUNCTION OR HEAT KERNEL IN SPACE WITH TORSION

XU DIAN-YAN, XU XIAO-FENG
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 241-247 doi: 10.1088/1004-423X/2/4/001
Full Text: [PDF 113 KB] (Downloads:265)
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An algorithm for asymptotic expansion of Green function or heat kemel in space with torsion is proposed. The De Witt-Seeley-Gilkey coeffcient E2(x) is calculated.

A DEMONSTRATION OF 1×8 LINEAR ARRAY YBCO TRANSITION EDGE IR BOLOMETER

LIU XIN-TIAN, SHI BAO-AN, YANG DE-JIA, CHEN ZHAO-JIA
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 248-251 doi: 10.1088/1004-423X/2/4/002
Full Text: [PDF 91 KB] (Downloads:342)
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A high-Tc superconducting array microbolometer has been fabricated by using a YBCO film. Optical measurements gave moderate performance as individual detector, but singnificant improverment appears possible.
CLASSICAL AREAS OF PHENOMENOLOGY

ATOMIC-COHERENCE-INDUCED ENHANCEMENT OF REFRACTIVE INDEX

LUO ZHEN-FEI, XU ZHI-ZHAN, ZHOU JIAO-YANG
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 252-259 doi: 10.1088/1004-423X/2/4/003
Full Text: [PDF 180 KB] (Downloads:301)
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The influences of lower-level coherence in atomic medium of Ξ-type energy-level scheme on the absorption and dispersion are studied in dressed states. It is found that a weak probe light of a certain fre-quency can be free of atomic absorption, and at the same time has a large index of refraction.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

RESISTIVE EFFECT ON ION FISHBONE MODE IN TOKAMAK PLASMA

SHI BING-REN, J.W.VANDAM, R.CARRERA, Y.Z.ZHANG
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 260-269 doi: 10.1088/1004-423X/2/4/004
Full Text: [PDF 221 KB] (Downloads:382)
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A consistent theoretical description of the resistive internal mode is presented to discuss the effect of resistivity on fishbone mode for different parameter regimes of bulk and hot components. We find that the ideal fishbone mode theory ceases to be correct for the low frequency fishbone branch, the so-called ion fishbone mode, which has a real frequency very dose to ω*i (the diamagnetic frequency) in marginal state. The stability domain analysis in (βhmhd) space based on the resistive dispersion relation shows that the transition between the stable and unstable regions is much more complicated than predicted by the ideal limit theory. Another salient feature of the resistive fishbone mode is the existence of a weakly unstable regime. For high frequency fishbone with ω≈ωdm (the toroidal precession frequency of the hot ions), resistivity has negligible effect and the ideal theory is correct.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

STUDIES ON THE RELATIONSHIPS BETWEEN THE STRUCTURE AND THE LOCALIZED ENERGY STATES OF POLY (ETHYLENE TEREPHTHALATE) ELECTRETS

ZHANG XING-YUAN, ZHOU YI-QIN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 270-279 doi: 10.1088/1004-423X/2/4/005
Full Text: [PDF 302 KB] (Downloads:326)
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A series of poly(ethytene terephthalate) (PET) films with different degrees of planar orientation [Δ(xy)z], crystallinity (Xc) and molecular weights were prepared by drawing biaxially, annealing at 110℃ and γ-imadiation of 0.5-4MGy. The peaks of localized energy states were separated from the detrapping cur-rent curves by means of poling temperature scanning method of themally stimulated current. The depth of localized energy levels enlarged with the rise of Δ(xy)z, Xc and γ-inadiation dose. The kinds of structural defects increased because of the changes of orientation structure of chains, crystalline structure and molecular chain structure, which caused the number of localized states to increase from 2 to 6 and the distribution width of the depth of localized levels to broaden.

ORDER ALLOY IN GexSi1-x/Si(100) STRAINED-LAYER SUPERLATFICES

YU SHI-DONG, LI QI, FENG DUAN, YU MING-REN, CHU YI-MING
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 280-285 doi: 10.1088/1004-423X/2/4/006
Full Text: [PDF 206 KB] (Downloads:350)
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The GexSi1-x/Si(100) strained-layer superlattices have been investigated by means of the transmission electron microscopy of the cross-sectional specimen (XTEM) and the high resolution electron microscopy (HREM), The order alloy with a period of modulation twice as large as the lattice constant along <100> zone axis has been found in the alloy layers of the superlattices with x≈0.4-0.5. This order struc-ture makes the superlattices inhomogeneously strained. The result of the compuler simulation shows that the order alloy exhibits an altemating stack of 2 monolayers of Ge atoms and 2 monolayers of Si atoms along the <100> zone axis. Thc calculated elastic strain energy of the disorder alloy reported in the litera-ture is very close to that of the order alloy along <100> zone axis. Thus, during the MBE growth of the alloy layers, both the disorder and order alloys can be formed along <100> zone axis.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

PROPERTIES OF PROPAGATION OF GUIDED ELECTRON WAVES IN COUPLED ASYMMETRIC QUANTUM WELLS

YUAN SHI-QI, GU BEN-YUAN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 286-299 doi: 10.1088/1004-423X/2/4/007
Full Text: [PDF 411 KB] (Downloads:249)
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In this article we investigate the properties of the propagation of guided electron waves in the coupled asymmetric quantum wells. By decomposing the eigenfunctions of electron in the coupled double quantum wells in terms of the basis eigenfunctions of the individual wells, the expression of the mode amplitude func-tions for various bare states in wells has been given. By setting up appropriate boundary conditions one can simulate different injecting manners of electron into the system and study how the electron waves trans-fer among various states. The major electron wave transfer happens between the matching bare states in wells. The particular pattern of the transfer depends on the injecting manner and the energy of the inci-dent electron. We also show the influence of the presence of the multimodes on the variatinn of the mode amplitude functions. It leads to producing some oscillations imposed on the original sinusoidal-like func-tions and causing incomplete transfer between a pair of states in channels due to the beating frequency effect or the interference among various modes.

SIZE EFFECT OF INNER RADIUS ON CIRCULARLY SYMMETRIC SOLITON STATES IN ANNULAR JOSEPHSON JUNCTIONS

XU KUN-MING, LU DAO-FANG, YAO XI-XIAN
Acta Phys. Sin. (Overseas Edition), 1993, 2 (4): 300-310 doi: 10.1088/1004-423X/2/4/008
Full Text: [PDF 295 KB] (Downloads:356)
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The effect of the inner radius of an annular Josephson junetion on the excitation 0f circularly symmetric soliton states is explored by direct numerical simulation. In a circularly symmetric annular Josephson junction (CSAJJ hereafter), the phase difference in the order parameters Φ across the junction bar-rier obeys the modified sine-Gordon equation (SGE) in which there is a perturbation term Φp/ρ inversely proportional to the radial coordinate ρ. and this term does not appear in the case of a 1D in-line junc-tion. The effect of the Φp/ρ term becomes prominent when ρ is small. It turns out that for junctions of grven dissipation and annular width, there is a lower limit of the inner radii for the junctions to support stable soliton motion, while the lower limit depends strongly on the dissipation coefficient α. For example, for a CSAJJ with inner radius 5λJ, outer radius 10λJ, no stable soliton states would exist when α=0.01 or α=0.02. However, for 0.06≥α≥0.03, there are ring-shaped solitary wave solutions, presumably because the dissipation suppresses the effect of the Φp/ρ term. Finally, the behaviour of the seliton states and the rele-vant I-V characteristics are also disscussed.
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