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Chin. Phys. B  
  Chin. Phys. B--1996, Vol.5, No.12
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GENERAL

HIGHER-ORDER CORRECTION FOR ROTATING WAVE APPROXIMATION, RABI TRANSFORMATION, AND ITS APPLICATIONS IN THE JAYNES-CUMMINGS MODEL

WANG XIAO-GUANG, SUN CHANG-PU
Chin. Phys. B 1996, 5 (12): 881 ;  doi: 10.1088/1004-423X/5/12/001
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Taking into account the consistence of the quantum adiabatic approximation and the rotating wave approximation in essence, we propose a method to study the interaction between atom and radiation field in a quantized cavity systematically. By using the exact solution of Jaynes-Cummings model as the lowest-order approximation, the effect of high frequency terms on the dynamics of atom-cavity field system is studied analytically.

OBSERVATIONS OF HOMOCLINIC CHAOS THROUGH ALTERNATING PERIODIC-CHAOTIC SEQUENCES IN A NONLINEAR CIRCUIT

MA LIAN-XI, SUN HONG-YAN, WANG LONG
Chin. Phys. B 1996, 5 (12): 890 ;  doi: 10.1088/1004-423X/5/12/002
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Homoclinic chaos in the alternating periodic-chaotic sequences is observed in a nonlinear circuit with sinusoidal driving force. In particular, a complete Alternating Periodic-Chaotic sequence is recorded with a high-resolution up to P(8) state. The experimental results, analyzed by constructing the time of flight and the next maximal amplitude return maps, are in good agreement with the scenario described by Shilnikov. The underlying dynamics of homoclinic chaos is determined from the next amplitude return map, to be that of a unimodal map and thus a strong dissipation case.
CLASSICAL AREAS OF PHENOMENOLOGY

A NEW MEASURE FOR THE JAYNES-CUMMINGS MODEL DYNAMICS DISTANCE BETWEEN DENSITY OPERATORS

HUANG YAN-XIA, GUO GUANG-CAN
Chin. Phys. B 1996, 5 (12): 901 ;  doi: 10.1088/1004-423X/5/12/003
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We use the distance between density operators to study the dynamical evolution of the Jaynes-Cummings model with an additional Kerr medium, and to compare the result with the corresponding von Neumann entropy. We have shown that the distance between density operators can provide more detailed information about the dynamical behavior of the quantum system than von Neumann entropy.

QUANTUM THEORY OF n-PHOTON CORRELATED-SPONTANEOUS-EMISSION LASERS

HU XIANG-MING, PENG JIN-SHENG
Chin. Phys. B 1996, 5 (12): 911 ;  doi: 10.1088/1004-423X/5/12/004
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In this paper, n-photon correlated-spontaneous-emission lasers (GEL's) are studied via the quantum theory of Scully-Lamb. It is shown that inversionless lazing can be exhibited; and phase squeezing can be produced in the inversionless region when the laser intensity is smaller than a certain value. The unified approach to n-photon CEL's is given and the properties between n-photon CEL's (n≥3) and CEL's of n = 1,2 are compared.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

ANALYTICAL MODELING OF THE RECOMBINATION CURRENT IN THE BASE-EMITTER SPACE CHARGE REGION OF HETEROJUNCTION BIPOLAR TRANSISTORS

YAN BEI-PING, LUO JIN-SHENG
Chin. Phys. B 1996, 5 (12): 923 ;  doi: 10.1088/1004-423X/5/12/005
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An analytical modeling of the recombination current in the base-emitter space charge region of heterojunction bipolar transistors is derived. The recombination rates as functions of distance in the space charge region are calculated for different hase doping concentrations. The relations between the space charge recombination current and the applied voltage have been determined.
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