Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1998, Vol.7, No.1
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CLASSICAL AREAS OF PHENOMENOLOGY

LIGHT TRACKS IN THE ANISOTROPIC OPTICAL FIBER WITH TWO TYPES OF PARABOLIC REFRACTIVE INDICES

SHEN WEN-DA, MAO LI-YU, GAO WEI, ZHU SHI-TONG
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 1-11 doi: 10.1088/1004-423X/7/1/001
Full Text: [PDF 214 KB] (Downloads:290)
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The light tracks in an anisotropic optical fiber are studied by the optical metric model. The ordinary and extraordinary light tracks are determined by solving the null geodesic equation. In the paraxial approximation the birefringence of the fiber is analyzed. The focusing and defocusing characte ristics of a light beam are described via the geodesic deviation equation

BACKACTION EVADING MEASUREMENT AND QUANTUM STATE PREPARATION FOR PHONONS BY USING THE RAMAN-INDUCED KERR EFFECT

CHAI JIN-HUA, GUO GUANG-CAN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 12-21 doi: 10.1088/1004-423X/7/1/002
Full Text: [PDF 245 KB] (Downloads:259)
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A scheme of quantum nondemolition measurement is proposed for probing the phonon inside a crystal by using the Raman-induced Kerr effect. The results of calculation show that under certain conditions either a backaction evading measurement or a quantum state preparation can be performed.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

DESTABILIZATION OF THE POLOIDAL ROTATION IN A MULTIPLE ION SPECIES TOKAMAK PLASMA

LIU CAI-GEN, QIAN SHANG-JIE
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 22-27 doi: 10.1088/1004-423X/7/1/003
Full Text: [PDF 175 KB] (Downloads:333)
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The destabilization of the poloidal rotation for the species of ions with the poloidally inhomogeneous sources or sinks is studied in multiple ion species tokamak plasmas. Based on the fluid equations, the evolution equation of the poloidal ion rotation speed is derived analytically. The magnitude of the inhomogeneous sources or sinks needed to destabilize the rotation is shown to be proportional to the ion density. It is suggested that the poloidal plasma rotation can be generated by destabilizing the rotation of the minority ions.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

BOUND POLARONS IN ASYMMETRIC QUANTUM WELLS IN AN ELECTRIC FIELD

LIU ZI-XIN, WENG YONG-GANG, SHI JUN-JIE, WANG ZHI-JIE, PAN SHAO-HUA
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 28-37 doi: 10.1088/1004-423X/7/1/004
Full Text: [PDF 263 KB] (Downloads:344)
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We have proposed the Hamiltonian of a polaron bound to a donor impurity in semiconductor quantum wells (QWs) in the presence of an electric field. The couplings of an electron with the confined bulk like longitudinal optical (L0) phonons, halfspace L0 phonons and interface phonons are considered. In particular, the interaction of the impurity with the various phonon modes is also included. We have calculated the ionization energy of a bound polaron in Alxl Ga1-xl As/GaAs/Alxr Ga1-xr As asymmetric and symmetric QWs. Results are obtained as a function of the barrier height (or equivalently of Al concentration x),the well width, the electric field intensities and the position of impurity in the QWs. Our numerical calculations show clearly that the interaction between the impurity and the phonon field plays an important role in screening the Coulomb interaction. It is shown that for at hin well (<12nm), the cumulative effects of the electronphonon coupling and the impurityphonon coupling can contribute appreciably to the donor ionization energy and polarizability.

STRUCTURE AND MAGNETIC PROPERTIES OF NITRIDES R3Fe29-xCrxN4

HAN XIU-FENG, ZAN YU-DE, WANG QI-YUAN, WANG JUN, YANG FU-MING, MA LONG
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 38-46 doi: 10.1088/1004-423X/7/1/005
Full Text: [PDF 210 KB] (Downloads:333)
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A systematic investigation of nitrides R3Fe29-xCrxN4(R=Y, Ce, Nd, Sm, Gd, Tb, and Dy) has been performed. The nitrogen concentration in the nitride R3Fe29-xCrxNy was determined to be y=4. Nitrogenation leads to a relative volume expansion of about 5.3%. The lattice constants and unit cell volume decrease with in creasing rare earth atomic number from Nd to Dy, reflecting the lanthanide contraction. In average, the increase of Curie temperature upon nitrogenation is about 200 K, compared with its parent compound. The nitrogenation also results in a remarkable improvement in the saturation magnetization and anisotropy fields for R3Fe29-xCrxN4 at 4.2 K and room temperature, comp ared with their parent compounds. A spin reorientation of Nd3Fe24.5 Cr4.5N4 occurs at around 368 K, which is 138 K higher than that of Nd3Fe24.5Cr4.5.Magnetohistory effects of R3Fe29-xCrxN4(R=Nd and Sm) are observed in a low field of 0.04 T. First order magneti zation process occurs in Sm3Fe24.0Cr5.0N4 in magnetic fields of around 3.0 T at 4.2 K. After nitrogenation the easy magnetization direction of Sm3Fe24.0Cr5.0 is changed from the easy cone structure to the uniaxial. The excellent intrinsic magnetic properties of Sm3Fe24.0Cr5.0N4 make this compound a hopeful candidate for new high performance permanent magnets.

NONLINEAR MAGNETIZATION AND FREQUENCY CONVERSION OF MAGNETOSTATIC WAVES IN A FERROMAGNETIC SLAB

WANG QI, LI CHUN-FANG, BAO JIA-SHAN, I. Awai, A.D.Boardman
Acta Phys. Sin. (Overseas Edition), 1998, 7 (1): 47-60 doi: 10.1088/1004-423X/7/1/006
Full Text: [PDF 404 KB] (Downloads:340)
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The possibilities of the generation of secondorder dc and secondharmonic magnetic fields excited by the magnetostatic surface wave (M SSW) and backward volume wave (MSBVW) in ferromagnetic films have been analyzed and discussed through the calculations of source terms in the equations satisfying the magnetostatic potentials. The results show that the nonlinear magnetization responses of the film to the MSSW can generate neither dc nor the secondhar monic magnetic fields. And the responses to the MSBVW will not induce the dc field, but can excite secondharmonics under some conditions. The general expressions of third order nonlinear magnetization are also derived and discussed.
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