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Chinese Physics Letters 1996年第8期13卷 565-567页

作者： wang ke-lin wang Mao-xi Center for Fundamental Physics University of Science and Technology of ChinaHefei 230026 Television University of Sichuan Chengdu 610072

With a new nonperturbative method,the problem of persistent currents in one-dimensional mesoscopic rings with consideration of electron-phonon coupling is exactly solved and the energy spectrum is *** result of this paper means that in the case of tight-binding model consideration of persistent currents can be treated separately from the interaction of electronphonon interaction.

关键词： interaction Electron exactly

Fermion Coherent State Studies of One-Dimensional Hubbard Model

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Communications in Theoretical Physics 2007年第1期47卷 161-166页

作者： lin Ji GAO Xian-Long wang ke-lin Department of Physics Zhejiang Normal University Jinhua 321004 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We present a comparative study of the ground state of the one-dimensional Hubbard model. We first use a new fermion coherent state method in the framework of Fermi liquid theory by introducing a hole operator and considering the interactions of two pairs electrons and holes. We construct the ground state of the Hubbard model as ｜〉=[f＋∑^tφk1σ1hk2σ2ck3σ3hk4σ4 ∏exp（ρck1σ1 hk2σ2）]｜〉0,where φ and ρ are the coupling constants. Our results are then compared to those of varlational methods, density functional theory based on the exact solvable Bethe ansatz solutions, variational Monto-Carlo method （VMC） as well as to the exact result of the infinite system. We find satisfactory agreement between the fermion coherent state scheme and the VMC data, and provide a new picture to deal with the strongly correlated system.

关键词： Hubbard model fermion coherent state density functional theory

Polaronic Band Structure of Holstein Model

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Chinese Physics Letters 2000年第2期17卷 129-131页

作者： WAN Shao-Long wang ke-lin CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Department of Astronomy and Applied Physics University of Science and Technology of ChinaHefei 230026

A new concise approach is presented for analytic study of the properties of the Holstein model. New analytic results for the polaronic band structure and phonon distribution, of the Holstein molecular crystal model, are given in one dimension. And all analytic results given are in accordance with the known numerical research results.

关键词： dimension. model analytic

Multi-soliton Solutions of the Konopelchenko-Dubrovsky Equation

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Chinese Physics Letters 2001年第9期18卷 1173-1175页

作者： lin Ji LOU Sen-Yue wang ke-lin Applied Physics Department Shanghai Jiao Tong UniversityShanghai 200030 Center of Nonlinear Science University of Science and Technology of ChinaHefei 230026 Department of Physics Zhejiang Normal UniversityJinghua 321004

By using the standard truncated Painlevé analysis, a Backlund transformation is used to obtain some new types of multi-soliton solutions of the (2+ 1)-dimensional integrable Konopelchenko-Dubrovsky equation from the ... 详细信息

关键词： solution. soliton trivial

Exact Solution of Quantum Dynamics of a Cantilever Coupling to a Single Trapped Ultracold Ion

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Communications in Theoretical Physics 2007年第3期47卷 561-566页

作者： LIU Tao FENG Mang wang ke-lin The School of Science Southwest University of Science and Technology Mianyang 621010 China State key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430070 China The Department of Modern Physics University of Science and Technology of China Hefei 230026 China

The quantum behavior ofa precooled cantilever can be probed highly efficiently by electrostatically coupling to a trapped ultracold ion, in which a fast cooling of the cantilever down to the ground vibrational state is possible. Within a simple model with an ultracold ion coupled to a cantilever with only few vibrational quanta, we solve the dynamics of the coupling system by a squeezed-state expansion technique, and can in principle obtain the exact solution of the time-evolution of the coupling system in the absence of the rotating-wave approximation. Comparing to the treatment under the rotating-wave approximation, we present a more accurate description of the quantum behavior of the cantilever.

关键词： ultracold ion cantilever squeezed-state

Calculation of the π Meson Electromagnetic Form Factor

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Chinese Physics Letters 2001年第6期18卷 743-745页

作者： wang Zhi-Gang WAN Shao-Long wang ke-lin Center for Nonlinear Science University of Science and Technology of ChinaHefei 230026 Department of Astronomy and Applied Physics University of Science and Technology of ChinaHefei 230026

The modified flat-bottom potential(MFBP)is given by the combination of the flat-bottom potential with considerations for the infrared and ultraviolet asymptotic behaviour of the effective quark-gluon ***πmeson electromagnetic form factor is calculated in the framework of coupled Schwinger-Dyson equation and Bethe-Salpeter equation in simplified impulse approximation(dressed vertex)with *** our numerical results give good fit to experimental values.

关键词： equation vertex simplified

Dynamics of Jaynes-Cummings Model in the Absence of Rotating-Wave Approximation

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Communications in Theoretical Physics 2007年第5期47卷 781-786页

作者： FAN Yun-Xia LIU Tao FENG Mang wang ke-lin School of Science Southwest University of Science and Technology Mianyang 621010 China State key Laboratory of Magnetic Resonance and Atomic and Molecular Physics~ Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430070 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

The Jaynes-Cummings model （JCM） is studied in the absence of the rotating-wave approximation （RWA） by a coherent-state expansion technique. In comparison with the previous paper in which the coherent-state expansion was performed only to the third order, we carry out in this paper a complete expansion to demonstrate exactly the dynamics of the JCM without the RWA. Our study gives a systematic method to solve the non-RWA problem, which would be useful in various physical systems, e.g., in a system with an ultracold trapped ion experiencing the running waves of lasers.

关键词： coherent-state expansion rotating-wave approximation (RWA) Jaynes-Cummings model (JCM)

Decoherence of Entangled States Calculated by a Systematic Approximate Method

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Communications in Theoretical Physics 2007年第5期47卷 791-800页

作者： LIU Tao FAN Yun-Xia HUANG Shu-Weng wang ke-lin wang Yi School of Sciences Southwest University of Science and Technology Mianyang 621010 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Institute of Thin Films and Nano-materials Wuyi University Jiangmen 529020 China

In this paper the coherent-state approximation （CA） method is used to deal with the problem of the decoherence of the entangled states of two two-state systems. As the base of the discussion, the dissipation of one two-state system has been investigated at first. The improved results calculated by CA are given in the paper. It is shown that the right approaching behavior and scaling law have been obtained when CA is applied to the problem of dissipation of two two-state systems coupled with environment. The whole evolution process and calculated results of the decoherence of the entangled states show also the scaling law, right approaching behavior, and rich phenomenon.

关键词： decoherence coherent-state two-state

Calculating the Relativistic Wave Functions of 11S0 and 13S1 Positronium

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Communications in Theoretical Physics 2001年第7期36卷 85-90页

作者： QIN Gan WAN Shao-Long HAN Rong-Dian wang ke-lin CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 Chinat Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 Chinat Department of Modern Physics University of Science and Technology of China Hefei 230026 China Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 Chinat

Based cn the relativistic Bethe-Salpeter (BS) equation, the positronium wavefunctions in Euclidean momentum space are obtained. Meanwhile the energy levels of positronium ground states 11S0 and 13S1 are fitted to be 6.7934 eV and 6.7929 eV respectively, which qualitatively agree with the previous theoretical values. It is shown that the BS theory is valid and reliable to treat positronium.

关键词： positronium, Bethe-Salpeter equation

The Spectrum in Qubit-Oscillator Systems in the Ultrastrong Coupling Regime

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Chinese Physics Letters 2012年第1期29卷 137-140页

作者： CHEN Qing-Hu LI Lei LIU Tao wang ke-lin Center for Statistical and Theoretical Condensed Matter Physics Zhejiang Normal UniversityJinhua 321004 Department of Physics Zhejiang UniversityHangzhou 310027 School of Science Southwest University of Science and TechnologyMianyang 621010 Department of Modern Physics University of Science and Technology of ChinaHefei 230026

Recent measurement on an LC resonator magnetically coupled to a superconducting qubit [***.105 (2010)237001] shows that the system operates in the ultra-strong coupling regime and crosses the limit of validity for the rotating-wave approximation of the Jaynes-Cummings model By using extended bosonic coherent states,we solve the Jaynes-Cummings model exactly without using the rotating-wave *** numerically exact results for the spectrum of the flux qubit coupled to the LC resonator are fully consistent with the experimental *** smallest Bloch-Siegert shift obtained is consistent with that observed in this *** addition,the Bloch-Siegert shifts in arbitrary level transitions and for arbitrary coupling constants are predicted.

关键词： arbitrary rotating coupling