Table of contents

20 December 1996, Volume 5 Issue 12 Previous issue    Next issue

GENERAL

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HIGHER-ORDER CORRECTION FOR ROTATING WAVE APPROXIMATION, RABI TRANSFORMATION, AND ITS APPLICATIONS IN THE JAYNES-CUMMINGS MODEL WANG XIAO-GUANG (王晓光), SUN CHANG-PU (孙昌璞) Acta Physica Sinica (Overseas Edition), 1996, 5 (12):  881-889.  DOI: 10.1088/1004-423X/5/12/001 Abstract ( 1282 )   PDF (178KB) ( 531 )   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.

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OBSERVATIONS OF HOMOCLINIC CHAOS THROUGH ALTERNATING PERIODIC-CHAOTIC SEQUENCES IN A NONLINEAR CIRCUIT MA LIAN-XI (马连喜), SUN HONG-YAN (孙红岩), WANG LONG (王龙) Acta Physica Sinica (Overseas Edition), 1996, 5 (12):  890-900.  DOI: 10.1088/1004-423X/5/12/002 Abstract ( 1086 )   PDF (295KB) ( 378 )   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

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A NEW MEASURE FOR THE JAYNES-CUMMINGS MODEL DYNAMICS --- DISTANCE BETWEEN DENSITY OPERATORS HUANG YAN-XIA (黄燕霞), GUO GUANG-CAN (郭光灿) Acta Physica Sinica (Overseas Edition), 1996, 5 (12):  901-910.  DOI: 10.1088/1004-423X/5/12/003 Abstract ( 1130 )   PDF (259KB) ( 386 )   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.

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QUANTUM THEORY OF n-PHOTON CORRELATED-SPONTANEOUS-EMISSION LASERS HU XIANG-MING (胡响明), PENG JIN-SHENG (彭金生) Acta Physica Sinica (Overseas Edition), 1996, 5 (12):  911-922.  DOI: 10.1088/1004-423X/5/12/004 Abstract ( 998 )   PDF (286KB) ( 364 )   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

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ANALYTICAL MODELING OF THE RECOMBINATION CURRENT IN THE BASE-EMITTER SPACE CHARGE REGION OF HETEROJUNCTION BIPOLAR TRANSISTORS YAN BEI-PING (严北平), LUO JIN-SHENG (罗晋生) Acta Physica Sinica (Overseas Edition), 1996, 5 (12):  923-929.  DOI: 10.1088/1004-423X/5/12/005 Abstract ( 1122 )   PDF (177KB) ( 498 )   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.