Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--2000, Vol.9, No.3
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GENERAL

SOME NEW AND EXACT EXPLICIT SOLUTIONS OF THE HIGHER ORDER BROER-KAUP EQUATIONS

Bai Cheng-lin, Bai Cheng-jie, Xu Bing-zhen
Chin. Phys., 2000, 9 (3): 161-165 doi: 10.1088/1009-1963/9/3/001
Full Text: [PDF 93 KB] (Downloads:338)
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A simple solitary wave solution and infinitely many rational function solutions, especially the closed form of the solution for the initial value problem of the higher order Broer-Kaup (BK) systems in (1+1) and (2+1) dimensions, are obtained by using the extended homogeneous balance method.

EXPLICIT REPRESENTATION OF PLANAR WAVE SPEED AND DISPERSIVE RELATION IN GENERAL EXCITABLE MEDIA

Zhou Tian-shou, Zhang Suo-chun
Chin. Phys., 2000, 9 (3): 166-170 doi: 10.1088/1009-1963/9/3/002
Full Text: [PDF 102 KB] (Downloads:246)
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We transform the problem of seeking the planar wave speed in general excitable media into a cubically algbraic equation, thus we can find the explicit representation of the planar wave speed (in one-dimensional case, the traveling wave speed) and dispersive relation. Especially for a few typical excitable media, we give the formula for calculating the corresponding wave speed.

INFLUENCE OF ENTANGLEMENT DEGREE ON SQUEEZING AND PHOTON ANTIBUNCHING IN THE JAYNES-CUMMINGS MODEL

Ye Liu, Guo Guang-can
Chin. Phys., 2000, 9 (3): 171-174 doi: 10.1088/1009-1963/9/3/003
Full Text: [PDF 136 KB] (Downloads:524)
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We consider the case that one of entangled atoms interacts with a single-mode cavity field. The atom is selectively detected after exiting the cavity, and it is found that the nonclassical properties of field states depend strongly on the entanglement degree between the two atoms. Meanwhile it is proven that squeezing of field and photon antibunching can be greatly enhanced via selective atomic measurements.

CHAOTIC SOLITON IN COUPLED LONG JOSEPHSON JUNCTIONS

Hai Wen-hua, Liu Xi-chun, Fang Jian-shu, Huang Wei-li, Zhang Xi-li
Chin. Phys., 2000, 9 (3): 175-179 doi: 10.1088/1009-1963/9/3/004
Full Text: [PDF 139 KB] (Downloads:396)
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The interaction between soliton and sinusoidal wave in two weakly coupled long Josephson junctions is studied. Theoretical analysis reveals that the soliton may be embedded in Melnikov chaotic attractors and the Fiske-step-modes are implied in the boundedness condition of the system. Comparison between the chaotic soliton oscillators and synchronized soliton oscillators shows that the former possesses greater maximal velocity and energy.
CLASSICAL AREAS OF PHENOMENOLOGY

NONLINEAR REFRACTION IN MULTILEVEL MOLECULAR SYSTEMS

Li Chun-fei, Wang Yu-xiao, Zhang Xue-ru
Chin. Phys., 2000, 9 (3): 194-198 doi: 10.1088/1009-1963/9/3/007
Full Text: [PDF 120 KB] (Downloads:389)
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The intensity-dependent nonlinear refraction phenomena in a non-resonant multilevel molecular system is studied using rate equations in steady state, including saturable refraction, reverse saturable refraction, and the turnover between these two effects. The relationship between the refraction saturation and the optical Kerr effect is also discussed.
ATOMIC AND MOLECULAR PHYSICS

STRETCHING VIBRATIONS OF BENZENE MOLECULE IN THE NONLINEAR MODEL

Zhu Jun, Chen Xiang-rong, Guo Qing-quan
Chin. Phys., 2000, 9 (3): 180-183 doi: 10.1088/1009-1963/9/3/005
Full Text: [PDF 101 KB] (Downloads:277)
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A five-parameter nonlinear model is introduced to the description of the stretching vibrational modes of benzene molecule in the electronic ground state, and is applied for the first time to the calculations of energy levels of C-H and C-D stretches of C6H6 and C6D6 in vapor phase. The results obtained agree well with the experimental vibrational energy levels and with the results obtained from other model calculations. Moreover, our model calculations predict accurately some new overtone and combination bands that have not been studied experimentally.

THE MID-INFRARED FREQUENCY STANDARD USING 14NmO(m=16,17,18) SPECTRAL LINES

Liu Yu-yan, Liu Hong-ping, Guo Yuan-qing, Lin Jie-li, Liu Xiao-yong, Huang Guang-ming, Li Feng-yan, Li Jin-rui
Chin. Phys., 2000, 9 (3): 184-193 doi: 10.1088/1009-1963/9/3/006
Full Text: [PDF 142 KB] (Downloads:339)
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Based on the global analysis of all available and reliable data for isotopic species 14NmO(m=16,17,18), the 14N16O rovibrational spectral lines are calculated with very high accuracy and completely agree with previous results. These lines with relative intensities can be achieved as an infrared frequency standard in the spectral range 1600-5600 cm-1. The calculated rovibrational transitions of 14NmO(m=17,18) have the same accuracy as that for 14N16O although their data are rare due to their small natural abundance.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

DYNAMICS IN A DRIVEN DISORDERED VORTEX LATTICE: A NUMERICAL STUDY

Cao Yi-gang, Jiao Zheng-kuan
Chin. Phys., 2000, 9 (3): 199-202 doi: 10.1088/1009-1963/9/3/008
Full Text: [PDF 116 KB] (Downloads:362)
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Using a repulsive vortex-vortex interaction model, we numerically investigate the dynamics of vortices in a driven disordered two-dimensional superconductor. At low driving forces and temperatures, we have seen the evidence of plastic and filamentary flow. At high driving forces and very low temperatures, the evidence of an ordering of the moving vortices is seen in the flux flow regime. Our results are in agreement with the previous simulation results and recent experiments.

INTEGRABILITY OF THE SPIN-1 XXX CHAIN WITH BOUNDARY IMPURITIES AND THEIR BETHE ANSATZ

Hou Bo-yu, Shi Kang-jie, Yue Rui-hong, Zhao Shao-you
Chin. Phys., 2000, 9 (3): 203-209 doi: 10.1088/1009-1963/9/3/009
Full Text: [PDF 111 KB] (Downloads:383)
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By using the fusion method, we give the spin-1 XXX chain associated with sl2 with two arbitrary spin boundary impurities. Then the exact diagonalized Hamiltonian of this model was obtained by the means of Bethe ansatz method.

SPECTROSCOPIC INVESTIGATION ON THE PROPERTIES OF VISIBLE AND NEAR INFRARED EMISSIONS IN Tm3+, Ho3+ Co-DOPED YVO4 CRYSTALS

Wang Jin-guo, Zhang Zhi-guo, Xu Jing-zhou, Xu Ji-ren, Fu Pan-ming, Chen Xiao-bo
Chin. Phys., 2000, 9 (3): 210-215 doi: 10.1088/1009-1963/9/3/010
Full Text: [PDF 166 KB] (Downloads:502)
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With the help of absorption and fluorescence spectra, the spectroscopic properties of Tm3+, Ho3+:YVO4 crystals have been investigated under different dopant concentrations. The absorption results show that the maximum absorption in the spectral range of currently available powerful laser diodes (LD) is at 796 nm, corresponding to the transition 3H63H4 of Tm3+ in the crystals. Upon the excitation with a LD at 808 nm, we have detected ten fluorescence bands in the spectral range spanning from visible to infrared. In visible region 4 upconversion bands have been observed centered at 475, 547, 660, and 701 nm. Discussions of the energy transfer processes suggest that cross relaxations and excited absorptions with the involvement of Tm3+ 3F4, 3H5 and Ho3+ 7I5 states are responsible for the four upconversion emissions. Comprising the relative integrated intersities of 2 μm (Ho3+: 5I75I8) and 1.8 μm (Tm3+: 3F_4→3H6) bands we have observed an efficient energy transfer from Tm3+ (3F4) to Ho3+ (5I7). Examination of the ratios of the intensity of 2 μm band to that of 1.8 μm band as a function of the ratios of Tm3+ concentration (cTm) to Ho3+ concentration (cHo) indicates that small concentration ratios (cTm/cHo) lead to high efficient energy transfers of Tm3+(3F4)→Ho3+(5I7).

POSITRON STUDY OF DEFECTS IN TiNi ALLOYS

Wang Jing-cheng, You Fu-qiang, Yin Jun-lin, Tang Xue-feng, Qi Jin-lin
Chin. Phys., 2000, 9 (3): 216-221 doi: 10.1088/1009-1963/9/3/011
Full Text: [PDF 166 KB] (Downloads:395)
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A number of TiNi samples with different compositions and states were measured by positron annihilation technique. And microdefects and the influence of them on shape memory effect were analyzed, giving some valuable information for the study of technological processes of preparing TiNi functional shape memory devices.
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