检索结果-南通市图书馆

Communications in Theoretical Physics 2008年第8期50卷 335-340页

作者： JIA Wen-Zhi wang shun-jin Center of Theoretical Physics Department of Physics Sichuan University Chengdu 610064 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

We find that in a supersymmetric quantum mechanics （SUSY QM） system, in addition to supersymmetric algebra, an associated SU（2） algebra can be obtained by using semiunitary （SUT） operator and projection operator, and the relevant constants of motion can be constructed. Two typical quantum systems are investigated as examples to demonstrate the above finding. The first example is the quantum system of a nonrelativistic charged particle moving in x-y plane and coupled to a magnetic field along z-axis. The second example is provided with the Dirac particle in a magnetic field. Similarly there exists an SUτ（2） SUσ（2） symmetry in the context of the relativistic Pauli Hamilt onian squared. We show that there exists also an SU（2） symmetry associated with the supersvmmetrv of the Dirac particle.

关键词： supersymmetric quantum mechanics Dirac equation semi-unitary transformation

Local Control of Two-Photon Absorption in a Six-Level Atomic System by Using a Coherent Perturbation Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第11期52卷 929-935页

作者： JIA Wen-Zhi wang shun-jin Laboratory of Quantum Opt-Electronic Information Southwest Jiaotong University Chengdu 610031 China Center of Theoretical Physics School of Physics Sichuan University Chengdu 610064 China

If a coherent perturbation field is used to couple the excited level of the coupling transition in the five-level K-type atom with another higher excited level, the two-photon electromagnetically induced transparency can be locally modulated by altering the parameters of the additional perturbation field. With different detunings of the coherent perturbation field, the absorption peak or transparency window with sharp and high-contrast speetrM feature can be generated in the two-photon absorption spectrum. The physical interpretation of these phenomena is given in terms of the dressed states.

关键词： dressed states electromagnetically induced transparency coherent perturbation field

VIC Effect and Phase-Dependent Optical Properties of Five-Level K-Type Atoms Interacting with Coherent Laser Fields

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第9期50卷 741-748页

作者： JIA Wen-Zhi wang shun-jin Center of Theoretical of Physics School of Physics Sichuan University Chengdu 610064 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

Due to interaction with the vacuum of the radiation field,a K-type atomic system with near-degenerateexcited and ground levels,which is driven by two strong coherent fields and two weak probe fields,has additional coherenceterms—the vacuum-induced coherence (VIC) *** this paper,we find that,if the interference is optimized,thetwo-photon absorption properties of this atom system can be significantly modified and electromagnetically-inducedtransparency (EIT) is dependent on this ***,we find that in all the cases the coherence can suppressor enhance the partial two-photon transparency,while the complete transparency window is still strictly preserved,whichmeans that it cannot be affected by the *** important result is the finding of the crucial role played by therelative phase between the probe and coupling fields:the relative height of absorption peaks can be modulated by therelative *** physical interpretation of the phenomena has been given.

关键词： vacuum-induced coherence electromagnetically-induced transparency phase-dependent opticalpro perties

A Unified Algebraic Dynamical Solution to General Two-Photon Algebra Systems

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第12期16卷 861-863页

作者： YING Zu-jian wang shun-jin Department of Modern Physics Lanzhou UniversityLanzhou 730000 Institute of Modern Physics Southwest Jiaotong UniversityChengdu 610031

We use squeezing and displacement operators and apply algebraic dynamics to develop a unified solution of general time-dependent two-photon algebra systems. A set of orthogonal-and-normalized solutions are derived wit... 详细信息

关键词： state operators algebra

Low-Lying Pentaquark Baryons in Pseudoscalar-Vector SU（3） Skyrme Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2X期48卷 319-325页

作者： XIA Zheng-Tong wang shun-jin ZHANG Hua Department of Physics Sichuan University Chengdu 610064 China

For the first time the low-lying J = 1/2 pentaquark states are investigated in the pseudoscalar-vector Skyrme model. Once the conventional baryon properties are fit, other states are predicted without any more adjustable parameters. Furthermore, both symmetry-breaking and decay operators are treated in full. In particular, we focus on the calculations of mass and decay width, and compare them with the experimental data available and relevant theoretical results obtained in other pictures. We recognize that the higher-order contributions, such as the 35 and/or 35 representation admixtures, are not negligible. Our analysis provides some valuable clues to the physical mechanisms, and the oncoming experimental search and/or confirmation could provide a sharp test of our proposal

关键词： nonstandard multiquark Skyrmions hadron mass calculations hadronic decays

Differential Representations of SO(4) Dynamical Group

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第7期50卷 63-68页

作者： ZHAO Dun wang shun-jin LUO Hong-Gang School of Mathematics and Statistics Lanzhou University Lanzhou 730000 China Department of Physics Sichuan University Chengdu 610064 China Center of Theoretical Physics and Interdisciplinary Studies Lanzhou University Lanzhou 730000 China Institute of Theoretical Physics Academia Sinica Beijing 100080 China

In this paper we present systematic differential representations for the dynamical group SO(4).Theserepresentations include the left and the right differential representations and the left and the right adjoint differentialrepresentations in both the group parameter space and its coset *** are the generalization of the differentialrepresentations of the SO(3) rotation group in the Euler *** representations may find their applications in thestudy of the physical systems with SO(4) dynamical symmetry.

关键词： dynamical group differential representation group action coset space

Even and Odd Coherent States for Time-Dependent Harmonic Oscillator

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第7期38卷 25-30页

作者： WEI Lian-Fu YANG Qing-Yi wang shun-jin Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Physics Guangxi University Nanning 530003 China Institute of Physics Southwest Jiao Tong University Chengdu 610031 China Department of Modern Physics Lanzhou University Lanzhou 730000 China

The dynamical invariant for a general time-dependent harmonic oscillator is constructed by making use of two linearly independent solutions to the classical equation of motion. In terms of this dynamical invariant we define the time-dependent creation and annihilation operators and relevantly introduce even and odd coherent states for time dependent harmonic oscillator. The mathematical and quantum statistical properties of these states are discussed in detail. The harmonic oscillator with periodically varying frequency is treated as a demonstration of our general approach.

关键词： even and odd coherent states, time-dependent harmonic oscillator, dynamical invariant

Light Flavor Vector and Pseudo Vector Mesons from a Light-Cone QCD Inspired Effective Hamiltonian Model with SU（3） Flavor Mixing Interactions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第6期27卷 37-39页

作者： GUO Xiao-Bo TAO Jun LI Lei wang shun-jin Center of Theoretical Physics School of Physics and Technology Sichuan University Chengdu 610064 School of Science Southwest University of Science and Technology Mianyang 621010 Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000

Based on the light-cone effective Hamiltonian with confining potential and SU （3） flavor mixing interactions, the flavor mixing mesons on the u, d, and s quark sectors are investigated. The mass eigen equations of the flavor mixing vector and pseudo vector mesons are solved. The calculated masses are in good agreement with the experimental data.

关键词： PARTICLES (Nuclear physics) -- Flavor VECTOR mesons LIGHT cones QUANTUM chromodynamics HAMILTONIAN systems SUPERSYMMETRY (Physics)

Dynamical Properties of Two Coupled Dissipative QED Cavities Driven by Coherent Fields

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2X期48卷 232-242页

作者： HOU Bang-Pin wang shun-jin wang Gang SUN Wei-Li School of Physics and Electronic Engineering Sichuan Normal University Chengdu 610066 China Department of Physics Sichuan University Chengdu 610065 China College of Computer and Communication Engineering Southwest Jiaotong University Chengdu 610031 China

When two identical QED cavities driven by the coherent fields are located in a uniform environment, in addition to dissipation, there appears an indirect coupling between the two cavities induced by the background fields. We investigate the effects of the coherent fields, the dissipation as well as the incoherent coupling on the following dynamical properties of the system： photon transfer, reversible decoherence, and quantum state transfer, etc. We find that the photons in the cavities do not leak completely into the environment due to the collective coupling between the cavities and the enviroment, and the photons are transferred irreversibly from the cavity with more photons to the cavity with less ones due to the incoherent coupling so that they are equally distributed among the two cavities. The coherent field pumping on the two cavities increases the mean photons, complements the revived magnitude of the reversible decoherence, but hinders the quantum state transfer between the two cavities. The above phenomena may find applications in quantum communication and other basic fields.

关键词： photon transfer reversible decoherence quantum state transfer algebraic dynamical method two coupled dissipative QED cavities driven by coherent fields

Exact Solution to Landau System with Time-Dependent Electromagnetic Fields

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第6期16卷 391-393页

作者： YING Zu-jian wang shun-jin ZHANG Wen-zhong Department of Modern Physics Lanzhou UniversityLanzhou 730000 Institute of Modern Physics Southwest Jiaotong UniversityChengdu 610031

Algebraic dynamics is applied to treat Landau *** consider the case with the vector potential A=B(g)(-y,0,0)and the scalar potentialφ=-E(t)y+k(t)y^(2),and find that the system has the dynamical algebra su(1,1)㊉h⑶.With a gauge transformation the exact solutions of the system are found,of which the quantum motion in y-direction represents a harmonic oscillator with a moving origin and a varying amplitude of width,the paramertes of the gauge transformation are related to the amplitude,the velocity potential and the expectations of y and py,*** energy of the system,the fluctuations of dynamical variables,the transition amplitudes between different states,and the Berry phase are calculated.

关键词： Landau gauge system